Method for assembling and welding titanium alloy large-size structural member

Abstract

The invention discloses a titanium alloy large-size structural part assembling and welding method which comprises the steps that a bottom plate is placed on a welding platform, and the upper surface of the bottom plate faces upwards; the positions of the multiple rib plates are adjusted, the faces, with the inverted-V-shaped chamfers, of the width ends of the rib plates face downwards, and the multiple rib plates are sequentially inserted into the multiple V-shaped grooves; a plurality of arch-shaped clamps are used for fastening the rib plates on the bottom plate; and positioning and welding the inverted V-shaped chamfers of the plurality of rib plates with the plurality of V-shaped grooves respectively. According to the assembling and welding method for the titanium alloy large-size structural part, the assembling difficulty of the bottom plate assembly can be reduced, the assembling precision is further improved, in addition, the problem that laser welding is limited can be solved, and product welding deformation can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of metal component welding, and in particular to a method for assembling and welding large-sized titanium alloy structural parts. Background Art

[0002] Large-sized titanium alloy structural parts are typical welded components. Due to their large dimensions and high requirements for their form and position tolerances, conventional argon arc welding is used. However, the welding deformation of the products after welding cannot be controlled and the weld penetration depth cannot meet the requirements, making it difficult for large-sized titanium alloy structural parts to meet the requirements for product use. Summary of the Invention

[0003] An embodiment of the present application provides a method for assembling and welding large-sized titanium alloy structural parts. The method for assembling and welding large-sized titanium alloy structural parts can reduce the difficulty of assembling the base plate assembly and improve the assembly accuracy. In addition, it can reduce the limitation problem of laser welding and help reduce product welding deformation.

[0004] According to the assembly and welding method of titanium alloy large-size structural parts in the embodiment of the present application, the titanium alloy large-size structural parts include: a base plate assembly, the base plate assembly includes a base plate and at least 6 ribs, the ribs are plugged into the base plate in the vertical direction, the base plate is constructed as a square plate, four of the ribs are respectively installed on the four sides of the base plate to define an installation space, and the remaining ribs are located in the installation space and plugged into each other, the upper surface of the base plate is provided with a plurality of V-shaped grooves, and the width end of the rib has a ∧-shaped chamfer. The assembly and welding method of the titanium alloy large-size structural parts includes: placing the base plate on the welding platform with the upper surface of the base plate facing upward; adjusting the positions of the plurality of ribs so that the width end of the rib has the ∧-shaped chamfer facing downward, and inserting the plurality of ribs into the plurality of V-shaped grooves in turn; fastening the plurality of ribs of the base plate with a plurality of bow clips; and positioning and welding the ∧-shaped chamfers of the plurality of ribs to the plurality of V-shaped grooves respectively.

[0005] According to the assembly and welding method of large-size titanium alloy structural parts in the embodiment of the present application, the difficulty of assembling the base plate assembly can be reduced and the assembly accuracy can be improved. In addition, the limitation problem of laser welding can be reduced and it is beneficial to reduce the welding deformation of the product.

[0006] According to the assembly and welding method of large-size titanium alloy structural parts in some embodiments of the present application, the positioning welding of the ∧-shaped chamfers of multiple ribs with multiple V-shaped grooves includes: adjusting the laser welding robot so that the gun head of the laser welding robot forms an angle of 45° with the horizontal direction; laser welding the V-shaped butt joints of each ∧-shaped chamfer and each V-shaped groove.

[0007] According to some embodiments of the present application, the method for assembling and welding large-size titanium alloy structural parts further includes: after the ∧-shaped chamfers of the multiple ribs are respectively positioned and welded with the multiple V-shaped grooves, continuous welding is performed, and the continuous welding includes: adjusting the laser welding robot so that the gun head of the laser welding robot forms an angle of 45° with the horizontal direction; laser welding continuously welds the horizontal docking parts of each of the ribs and the base plate in the horizontal plane; laser welding continuously welds the vertical docking parts of the two connected ribs in the vertical direction.

[0008] According to some embodiments of the present application, the method for assembling and welding large-sized titanium alloy structural parts further includes: performing heat treatment after the continuous welding, and the heat treatment includes: vacuum heat treatment of the base plate assembly to release welding residual stress.

[0009] According to some embodiments of the present application, the assembly and welding method of large-size titanium alloy structural parts further includes: after the ∧-shaped chamfers of the multiple ribs are positioned and welded with the multiple V-shaped grooves, the multiple bow clips are removed.

[0010] According to some embodiments of the present application, the assembly and welding method of large-size titanium alloy structural parts further includes: a panel assembly, the panel assembly includes a panel, longitudinal ribs and transverse ribs, the mounting surface of the panel is provided with a depression for installing the longitudinal ribs and the transverse ribs, and the assembly and welding method of large-size titanium alloy structural parts further includes: placing the panel on the welding platform with the mounting surface of the panel facing upward; adjusting the positions of the longitudinal ribs and the transverse ribs so that the ends with straight edges in the width direction of the longitudinal ribs and the transverse ribs face downward, and placing the longitudinal ribs and the transverse ribs in the depression of the panel in turn, and at the same time, the first U-shaped groove on the transverse rib and the second U-shaped groove on the longitudinal rib are plugged into each other in place; and fastening the panel, the longitudinal ribs and the transverse ribs with the bow clip.

[0011] According to some embodiments of the present application, the assembly and welding method of large-sized titanium alloy structural parts, the large-sized titanium alloy structural parts also include: a mounting plate, the mounting plate has a rectangular shape, two circular openings are processed in the thickness direction, and four triangular bosses are processed around one side of one of the circular openings, and a 2mm deep depression is processed on the other side along the width direction of the mounting plate; the assembly and welding method of large-sized titanium alloy structural parts also includes: adjusting the position of the mounting plate so that the end of the mounting plate with the depression in the width direction faces downward, and ensuring that the side of the mounting plate with the depression faces the transverse rib; placing the mounting plate in the depression on the panel, and ensuring that one end of the transverse rib is embedded in the depression on the mounting plate, and fastening the panel and the mounting plate with the bow clip.

[0012] According to some embodiments of the present application, the assembly and welding method of titanium alloy large-size structural parts further includes: a right side panel, a left side panel, a front panel and a rear panel. The assembly and welding method of titanium alloy large-size structural parts further includes: adjusting the position of the front panel so that the sunken end of the front panel in the width direction faces downward, and ensuring that the sunken side of the front panel is facing the longitudinal rib; adjusting the position of the right side panel so that the sunken end of the right side panel in the width direction faces downward, and ensuring that the sunken side of the right side panel faces the transverse rib; adjusting the position of the left side panel so that the side of the left side panel with four triangular bosses in the thickness direction faces outward, and ensuring that the small rectangular opening on the left side panel faces upward; adjusting the position of the rear panel so that the sunken end of the rear panel in the width direction faces downward, and ensuring that the sunken side of the rear panel faces the longitudinal rib.

[0013] According to some embodiments of the present application, the assembly and welding method of large-size titanium alloy structural parts further includes: placing the right side panel, the left side panel, the front panel, and the rear panel in the depressions around the panels in sequence; adjusting the positions of the front panel, the right side panel, the left side panel, and the rear panel to ensure that the length ends of the mounting plate, the longitudinal rib, the right side panel, and the left side panel are respectively embedded in the depressions corresponding to the front panel and the depressions corresponding to the rear panel, and one end of the transverse rib is embedded in the depression corresponding to the right side panel.

[0014] According to some embodiments of the present application, the method for assembling and welding a large-sized titanium alloy structural member further comprises: laser welding the bottom plate to the four horizontal butt joints on the outside of the front panel, the right side panel, the left side panel, and the rear panel;

[0015] Laser welding is performed to position weld the front panel, the right side panel, the left side panel, the rear panel, the panel, the mounting plate, the internal vertical right-angle welding parts formed between the transverse ribs and the longitudinal ribs.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 It is a three-dimensional view of a large-scale titanium alloy structural part;

[0019] Figure 2 This is a three-dimensional view of the bottom of a large-scale titanium alloy structural component;

[0020] Figure 3 This is the main view of a large-sized titanium alloy structural component;

[0021] Figure 4 This is the left side view of a large-sized titanium alloy structural component;

[0022] Figure 5 It is a top view of a large-scale titanium alloy structural part;

[0023] Figure 6 is the main view of the first stiffener;

[0024] Figure 7 It is the left view of the first stiffener;

[0025] Figure 8 is a top view of the first rib;

[0026] Figure 9 is the main view of the second stiffener;

[0027] Figure 10 It is the left view of the second stiffener;

[0028] Figure 11 is a top view of the second rib;

[0029] Figure 12 This is the main view of the third stiffener;

[0030] Figure 13 It is the left view of the third stiffener;

[0031] Figure 14 is a top view of the third rib;

[0032] Figure 15 It is the main view of the fourth stiffener;

[0033] Figure 16 It is the left view of the fourth stiffener;

[0034] Figure 17 is a top view of the fourth stiffener;

[0035] Figure 18 This is the main view of the fifth stiffener;

[0036] Figure 19 It is the left view of the fifth stiffener;

[0037] Figure 20 is a top view of the fifth stiffener;

[0038] Figure 21 This is the main view of the sixth stiffener;

[0039] Figure 22 It is the left view of the sixth stiffener;

[0040] Figure 23 is a top view of the sixth stiffener;

[0041] Figure 24 This is the main view of the seventh stiffener;

[0042] Figure 25 It is the left view of the seventh stiffener;

[0043] Figure 26 is a top view of the seventh stiffener;

[0044] Figure 27 It is the main view of the eighth stiffener;

[0045] Figure 28 It is the left view of the eighth stiffener;

[0046] Figure 29 is a top view of the eighth rib;

[0047] Figure 30 This is the main view of the ninth stiffener;

[0048] Figure 31 This is the left view of the ninth stiffener;

[0049] Figure 32 is a top view of the ninth rib;

[0050] Figure 33 This is a cross-sectional view of the bottom plate before welding;

[0051] Figure 34 This is the top view of the bottom plate before welding;

[0052] Figure 35 This is the bottom view of the bottom plate after welding;

[0053] Figure 36 is a bottom view of the front panel;

[0054] Figure 37 This is the main view of the front panel;

[0055] Figure 38 is a top view of the front panel;

[0056] Figure 39 This is the main view of the right side panel;

[0057] Figure 40 It is a top view of the right side panel;

[0058] Figure 41 This is the main view of the left side panel;

[0059] Figure 42 It is a top view of the left side panel;

[0060] Figure 43 This is a bottom view of the rear panel;

[0061] Figure 44 This is the main view of the rear panel;

[0062] Figure 45 is a top view of the rear panel;

[0063] Figure 46 is a bottom view of the panel;

[0064] Figure 47 This is the main view of the panel;

[0065] Figure 48 is a top view of the panel;

[0066] Figure 49 This is a bottom view of the mounting plate;

[0067] Figure 50 This is the main view of the mounting plate;

[0068] Figure 51 is a top view of the mounting plate;

[0069] Figure 52 It is the main view of the transverse reinforcement;

[0070] Figure 53 It is the main view of the longitudinal reinforcement;

[0071] Figure 54 This is a three-dimensional diagram of the base plate assembly before welding;

[0072] Figure 55 This is a three-dimensional diagram of the bottom of the base plate assembly before welding;

[0073] Figure 56This is a three-dimensional image of the bottom plate assembly after welding and machining;

[0074] Figure 57 A three-dimensional diagram of the panel assembly;

[0075] Figure 58 Schematic diagram of local laser welding of the base plate assembly;

[0076] Figure 59 Schematic diagram of local laser welding of the base plate assembly;

[0077] Figure 60 This is a schematic diagram of manual argon arc welding at the intersection of the ribs on the bottom plate assembly;

[0078] Figure 61 Schematic diagram of manual argon arc welding at the intersection of the ribs on the bottom plate assembly.

[0079] Reference numerals:

[0080] Titanium alloy large-size structural parts 100;

[0081] First rib 1; second rib 2; third rib 3; fourth rib 4; fifth rib 5; sixth rib 6; seventh rib 7; eighth rib 8; ninth rib 9; bottom plate 10; front panel 11; right side panel 12; left side panel 13; rear panel 14; panel 15; mounting plate 16; transverse rib 17; longitudinal rib 18. DETAILED DESCRIPTION

[0082] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0083] In this article, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the statement "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The term "two or more" includes two or more than two cases.

[0084] The following is combined with Figure 1-61 The present invention describes the assembly and welding method of large-sized titanium alloy structural parts.

[0085] The titanium alloy large-size structural member 100 of the present application is as follows Figure 1 As shown, Figure 2 As shown, the large-sized titanium alloy structural component 100 includes: a base plate assembly.

[0086] like Figure 2 As shown, the base plate assembly includes a base plate 10 and at least 6 ribs, which are plugged into the base plate 10 in the vertical direction. The base plate 10 is constructed as a square plate. Four ribs are respectively installed on the four sides of the base plate 10 to define an installation space. The remaining ribs are located in the installation space and plugged into each other. The upper surface of the base plate 10 is provided with multiple V-shaped grooves, and one end of the width of the rib has a ∧-shaped chamfer. The assembly and welding method of large-size titanium alloy structural parts includes:

[0087] Place the base plate 10 on the welding platform with the upper surface of the base plate 10 facing upwards;

[0088] Adjust the positions of multiple ribs so that the side with the ∧-shaped chamfer at one end of the width of the rib faces downward, and insert the multiple ribs into multiple V-shaped grooves in turn; in this way, the insertion and positioning of the ribs and the base plate 10 can be achieved, thereby enhancing the connection stability between the ribs and the base plate 10 and reducing product welding deformation.

[0089] Use multiple bow-shaped clips to fasten multiple ribs of the bottom plate 10; in this way, the ribs and the bottom plate 10 can be further limited, thereby enhancing the connection stability of the ribs and the bottom plate 10 and reducing product welding deformation.

[0090] The ∧-shaped chamfers of the plurality of rib plates are respectively positioned and welded to the plurality of V-shaped grooves.

[0091] In this way, the rib plate and the base plate 10 can be plugged in and positioned and assembled first by means of ∧-shaped chamfers and V-shaped grooves, and then the base plate 10 and the rib plate can be relatively limited by means of bow-shaped clips. Finally, the ∧-shaped chamfers of multiple rib plates can be positioned and welded to multiple V-shaped grooves respectively. In this way, the difficulty of assembling the base plate assembly can be reduced, and the assembly accuracy can be improved. In addition, the limitation problem of laser welding can be reduced, and it is beneficial to reduce the welding deformation of the product.

[0092] According to the assembly and welding method of large-size titanium alloy structural parts in the embodiment of the present application, the difficulty of assembling the base plate assembly can be reduced and the assembly accuracy can be improved. In addition, the limitation problem of laser welding can be reduced and it is beneficial to reduce the welding deformation of the product.

[0093] In some embodiments, tack welding the ∧-shaped chamfers of the plurality of ribs to the plurality of V-shaped grooves comprises:

[0094] Adjust the laser welding robot so that the gun head of the laser welding robot forms a 45° angle with the horizontal direction;

[0095] Laser welding is used to position and weld each ∧-shaped chamfer and each V-shaped groove at the V-shaped butt joint.

[0096] In this way, the operation of laser welding positioning welding is easy to realize, and the laser welding positioning welding can be made more reliable. After the ∧-shaped chamfers of multiple ribs are positioned and welded with multiple V-shaped grooves respectively, relatively stable welding conditions can be provided for subsequent connection welding, thereby improving the subsequent continuous welding quality.

[0097] In some embodiments, the method for assembling and welding large-sized titanium alloy structural parts further includes:

[0098] After the ∧-shaped chamfers of multiple ribs are positioned and welded to multiple V-shaped grooves, continuous welding is performed. The continuous welding includes:

[0099] Adjust the laser welding robot so that the gun head of the laser welding robot forms a 45° angle with the horizontal direction;

[0100] Laser welding continuously welds each rib plate and the bottom plate 10 at the horizontal joint in the horizontal plane;

[0101] Laser welding continuously welds the vertical butt joints of two connected ribs in the vertical direction.

[0102] In this way, after the ∧-shaped chamfers of multiple ribs are position-welded to multiple V-shaped grooves respectively, the welding area can be increased through continuous welding to improve welding reliability and reduce product welding deformation.

[0103] In some embodiments, the method for assembling and welding large-sized titanium alloy structural parts further includes: performing heat treatment after continuous welding, the heat treatment comprising:

[0104] The base plate assembly is vacuum heat treated to relieve welding residual stress.

[0105] It can be understood that vacuum heat treatment refers to heating the weldment in a vacuum environment to avoid oxidation and contamination, thereby improving the effect of heat treatment. Heat treatment is the main method to eliminate welding residual stress after welding. By heating the weldment as a whole or locally to above the recrystallization temperature and keeping it warm for a period of time, part or all of the deformation can be restored to the initial position, thereby achieving the purpose of eliminating welding residual stress.

[0106] Vacuum heat treatment not only eliminates residual welding stress but also improves material properties. For example, it can reduce the hardness of the heat-affected zone and enhance the weld's corrosion resistance, brittle fracture strength, creep strength, and corrosion cracking resistance. These improvements help extend the weld's service life and enhance its reliability.

[0107] Heat treatment in a vacuum environment prevents contamination of the material surface by oxygen, moisture, and other pollutants in the air. This helps keep the surface clean and prevents performance degradation caused by contamination. Furthermore, vacuum heat treatment prevents surface oxidation, thereby maintaining the material's original properties.

[0108] In some embodiments, the method for assembling and welding large-sized titanium alloy structural parts further includes:

[0109] After the ∧-shaped chamfers of the multiple ribs are positioned and welded to the multiple V-shaped grooves, the multiple arch clips are removed. It is understood that the arch clips used for auxiliary positioning can be removed after the bottom plate assembly is welded to reduce the risk of deformation during the welding process.

[0110] In some embodiments, the large-sized titanium alloy structural member 100 further includes: a panel assembly, the panel assembly including a panel 15, longitudinal ribs 18, and transverse ribs 17, the mounting surface of the panel 15 being provided with a depression for mounting the longitudinal ribs 18 and transverse ribs 17, and the assembly and welding method of the large-sized titanium alloy structural member further includes:

[0111] Place the panel 15 on the welding platform with the installation surface of the panel 15 facing upwards;

[0112] Adjust the positions of the longitudinal ribs 18 and transverse ribs 17 so that the ends with straight edges in the width direction of the longitudinal ribs 18 and transverse ribs 17 face downwards, and sequentially place the longitudinal ribs 18 and transverse ribs 17 into the depressions of the panel 15. At the same time, the first U-shaped groove on the transverse rib 17 and the second U-shaped groove on the longitudinal rib 18 are inserted into each other.

[0113] Use bow clips to fasten the panel 15, longitudinal reinforcement 18 and transverse reinforcement 17.

[0114] In this way, the insertion limit of the longitudinal reinforcement 18 and the transverse reinforcement 17 and the panel 15 can be realized first to enhance the connection stability of the longitudinal reinforcement 18 and the transverse reinforcement 17 and the panel 15, and the panel 15, the longitudinal reinforcement 18 and the transverse reinforcement 17 are further limited and fixed by the bow-shaped clip, thereby further enhancing the connection stability of the longitudinal reinforcement 18 and the transverse reinforcement 17 and the panel 15, thereby providing a stable welding environment for subsequent welding, thereby reducing the risk of deformation during the product welding process.

[0115] In some embodiments, the large-scale titanium alloy structural component 100 further includes: a mounting plate 16, which is rectangular in shape and has two circular openings in the thickness direction, and one of the circular openings is surrounded by four triangular bosses, and the other side is provided with a 2 mm deep depression along the width direction of the mounting plate 16;

[0116] The assembly and welding methods of large-size titanium alloy structural parts also include:

[0117] Adjust the position of the mounting plate 16 so that the depressed end of the mounting plate 16 in the width direction faces downward, and ensure that the depressed side of the mounting plate 16 faces the transverse rib 17;

[0118] Place the mounting plate 16 in the depression on the panel 15, and ensure that one end of the transverse rib 17 is embedded in the depression on the mounting plate 16, and fasten the panel 15 and the mounting plate 16 with a bow clip.

[0119] In this way, the plug-in limit of the mounting plate 16 and the panel 15 can be achieved first to enhance the connection stability between the mounting plate 16 and the panel 15, and the mounting plate 16 and the longitudinal rib 18 are further limited and fixed by the clamping, thereby further enhancing the connection stability between the mounting plate 16 and the panel 15, thereby providing a stable welding environment for subsequent welding, thereby reducing the risk of deformation during product welding.

[0120] In some embodiments, the large-sized titanium alloy structural component 100 further includes: a right side plate 12, a left side plate 13, a front panel 11, and a rear panel 14. The assembly and welding method of the large-sized titanium alloy structural component further includes:

[0121] Adjust the position of the front panel 11 so that the sunken end of the front panel 11 in the width direction faces downward, and ensure that the sunken side of the front panel 11 faces the longitudinal rib 18; in this way, the insertion limit of the front panel 11 and the longitudinal rib 18 can be achieved first to enhance the connection stability of the front panel 11 and the longitudinal rib 18, thereby providing a stable welding environment for subsequent welding, thereby reducing the risk of deformation during the product welding process.

[0122] Adjust the position of the right side plate 12 so that the sunken end of the right side plate 12 in the width direction faces downward, and ensure that the sunken side of the right side plate 12 faces the transverse rib 17; in this way, the insertion limit of the right side plate 12 and the transverse rib 17 can be achieved first to enhance the connection stability of the right side plate 12 and the transverse rib 17, thereby providing a stable welding environment for subsequent welding, thereby reducing the risk of deformation during product welding.

[0123] Adjust the left side panel 13 so that the side with the four triangular bosses in the thickness direction faces outward, and ensure that the small rectangular opening on the left side panel 13 faces upward; adjust the rear panel 14 so that the end with the depression in the width direction faces downward, and ensure that the depression side of the rear panel 14 faces the longitudinal rib 18. This can first achieve the insertion limit of the rear panel 14 and the longitudinal rib 18, thereby enhancing the connection stability of the rear panel 14 and the longitudinal rib 18, thereby providing a stable welding environment for subsequent welding, and thus reducing the risk of product deformation during welding.

[0124] In some embodiments, the method for assembling and welding large-sized titanium alloy structural parts further includes:

[0125] Place the right side panel 12, the left side panel 13, the front panel 11, and the rear panel 14 in the depressions around the panel 15 in sequence; in this way, the right side panel 12, the left side panel 13, the front panel 11, the rear panel 14 and the panel 15 can be limited in insertion to enhance the connection stability between the right side panel 12, the left side panel 13, the front panel 11, the rear panel 14 and the panel 15, thereby providing a stable welding environment for subsequent welding, thereby reducing the risk of deformation during the product welding process.

[0126] Adjust the positions of the front panel 11, the right side panel 12, the left side panel 13 and the rear panel 14 to ensure that the ends of the length of the mounting plate 16, the longitudinal ribs 18, the right side panel 12 and the left side panel 13 are respectively embedded in the corresponding depressions of the front panel 11 and the rear panel 14, and one end of the length of the transverse rib 17 is embedded in the corresponding depression of the right side panel 12.

[0127] In some embodiments, the method for assembling and welding large-sized titanium alloy structural parts further includes:

[0128] Laser welding is performed to weld the four horizontal joints between the bottom plate 10 and the front panel 11, the right side panel 12, the left side panel 13 and the rear panel 14. In this way, the four horizontal joints between the bottom plate 10 and the front panel 11, the right side panel 12, the left side panel 13 and the rear panel 14 can be welded.

[0129] Laser welding is performed to position and weld the internal vertical right-angle welding parts formed among the front panel 11 , the right side panel 12 , the left side panel 13 , the rear panel 14 , the panel 15 , the mounting plate 16 , the transverse ribs 17 and the longitudinal ribs 18 .

[0130] In this way, the welding area between the bottom plate 10 and the front panel 11 , the right side plate 12 , the left side plate 13 and the rear panel 14 can be increased, thereby improving stability.

[0131] The following is combined with Figure 1-61 Describe a specific method for assembling and welding a large-sized titanium alloy structural part of the present application, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 As shown, as a component structural member of a certain system, the titanium alloy large-size structural member 100 includes a plurality of ribs, and the plurality of ribs include a first rib 1, a second rib 2, a third rib 3, a fourth rib 4, a fifth rib 5, a sixth rib 6, a seventh rib 7, an eighth rib 8, a ninth rib 9, a bottom plate 10, a front panel 11, a right side panel 12, a left side panel 13, a rear panel 14, a panel 15, a mounting plate 16, a transverse rib 17 and a longitudinal rib 18.

[0132] like Figure 6 、 Figure 7 and Figure 8 As shown, the first rib 1 has a rectangular strip shape, and is processed with several rectangular lightening holes of different lengths in the thickness direction. A C8.5 single-sided chamfer 1-1 is processed at one end in the width direction of the first rib 1, and three V-grooves 1-2 are processed in the thickness direction of the first rib 1 near the single-sided chamfer 1-1.

[0133] The first rib 1 is made of TC4 titanium alloy and is formed by integral machining.

[0134] like Figure 9 、 Figure 10 and Figure 11 As shown, the outer dimensions of the second rib 2 are consistent with those of the first rib 1, and a number of rectangular lightening holes of different lengths are processed in the thickness direction. A single-sided chamfer 2-1 of C8.5 is processed at one end in the width direction of the second rib 2, and three V-grooves 2-2 are processed in the thickness direction of the second rib 2 near the single-sided chamfer 2-1.

[0135] The second rib 2 is made of TC4 titanium alloy and is formed by integral machining.

[0136] like Figure 12 、 Figure 13 and Figure 14 As shown, the structure of the third rib 3 is similar to that of the first rib 1, and a number of rectangular lightening holes of different lengths are processed in the thickness direction, wherein a C8.5 single-sided chamfer 3-1 is processed at one end in the width direction of the third rib 3, and the single-sided chamfer 3-1 does not pass through the two ends of the length of the third rib 3. At the same time, two V-grooves 3-2 are processed in the thickness direction of the third rib 3 near the single-sided chamfer 3-1, and a 2mm deep depression 3-3 is processed in the thickness direction near the single-sided chamfer 3-1 at both ends of the length of the third rib 3.

[0137] The third rib 3 is made of TC4 titanium alloy and is formed by integral machining.

[0138] Figure 15 、 Figure 16 and Figure 17As shown, the outer dimensions of the fourth rib 4 are consistent with those of the third rib 3, and a number of rectangular lightening holes of different lengths are processed in the thickness direction. A C8.5 single-sided chamfer 4-1 is processed at one end in the width direction of the fourth rib 4, two V-shaped grooves 4-2 are processed in the thickness direction of the fourth rib 4 near the single-sided chamfer 4-1, and a 2mm deep depression 4-3 is processed in the thickness direction near the single-sided chamfer 4-1 at both ends of the length of the fourth rib 4.

[0139] The fourth rib 4 is made of TC4 titanium alloy and is formed by integral machining.

[0140] like Figure 18 、 Figure 19 and Figure 20 As shown, the fifth rib 5 has a rectangular strip shape, and is processed with a number of rectangular lightening holes of different lengths in the thickness direction. An intermittent ∧-shaped chamfer 5-1 is processed at one end in the width direction of the fifth rib 5, and two U-shaped grooves 5-2 are also processed on the end face. A ∧-shaped chamfer 5-3 is processed at each end in the length direction of the fifth rib 5.

[0141] The fifth rib 5 is made of TC4 titanium alloy and is formed by integral machining.

[0142] like Figure 21 、 Figure 22 and Figure 23 As shown, the appearance of the sixth rib 6 is consistent with that of the fifth rib 5 except for the rectangular lightening hole in the thickness direction. An intermittent ∧-shaped chamfer 6-1 is processed at one end in the width direction of the sixth rib 6, and two U-shaped grooves 6-2 are also processed on the end face. A ∧-shaped chamfer 6-3 is processed at each end in the length direction of the sixth rib 6.

[0143] The sixth rib 6 is made of TC4 titanium alloy and is formed by integral machining.

[0144] like Figure 24 、 Figure 25 and Figure 26 As shown, the seventh rib 7 is in the same state as the sixth rib 6. An intermittent ∧-shaped chamfer 7-1 is processed at one end in the width direction of the seventh rib 7. Two U-shaped grooves 7-2 are also processed on the end face. A ∧-shaped chamfer 7-3 is processed at each end in the length direction of the seventh rib 7.

[0145] The seventh rib 7 is made of TC4 titanium alloy and is formed by integral machining.

[0146] like Figure 27 、 Figure 28 and Figure 29As shown, the eighth rib 8 has a rectangular strip shape, and is processed with a number of rectangular lightening holes of different lengths in the thickness direction. An intermittent ∧-shaped chamfer 8-1 is processed at one end in the width direction of the eighth rib 8, and three U-shaped grooves 8-2 are processed at the other end. A ∧-shaped chamfer 8-3 is processed at each end in the length direction of the eighth rib 8.

[0147] The eighth rib 8 is made of TC4 titanium alloy and is formed by integral machining.

[0148] like Figure 30 、 Figure 31 and Figure 32 As shown, the ninth rib 9 has the same shape as the eighth rib 8, except for the rectangular lightening holes in the thickness direction. A discontinuous ∧-shaped chamfer 9-1 is machined at one end in the width direction of the ninth rib 9, and three U-shaped grooves 9-2 are machined at the other end. A ∧-shaped chamfer 9-3 is machined at each end in the length direction of the ninth rib 9.

[0149] The ninth rib 9 is made of TC4 titanium alloy and is formed by integral machining.

[0150] like Figure 33 and Figure 34 As shown, the bottom plate 10 is rectangular in shape. In order to facilitate assembly and welding with the first to ninth ribs 1 to 9, a grid V-groove 10-1 matching the shape of the first to ninth ribs 9 is processed on the lower surface of the bottom plate 10. The grid V-groove 10-1 is formed by 3D printing, wherein the outer periphery of the bottom plate 10 is convenient for laser horizontal welding, so the groove 10-1 on the outer periphery of the bottom plate 10 is processed into a semi-V shape.

[0151] like Figure 35 As shown, after the bottom plate 10 and the first to ninth ribs 1 to 9 are assembled and welded, in order to facilitate assembly with the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14 and the mounting plate 16, a 2 mm deep depression 10-2 is processed on the upper surface of the bottom plate 10.

[0152] The base plate 10 is made of TC4 titanium alloy and is formed by 3D printing + machining.

[0153] like Figure 36 、 Figure 37 and Figure 38 As shown, the front panel 11 is rectangular in shape, with three rectangular openings and one circular opening processed in the thickness direction, and a circular boss processed on one side of the circular opening, and four 2mm deep depressions 11-1 processed along the width direction of the front panel 11 on the other side.

[0154] The front panel 11 is made of TC4 titanium alloy and is formed by integral machining.

[0155] like Figure 39 、 Figure 40 and Figure 41 As shown, the right side plate 12 is rectangular in shape, with a rectangular opening and a circular opening processed in the thickness direction, and a 2mm deep depression 12-1 processed on one side of the right side plate 12 in the thickness direction.

[0156] The right side plate 12 is made of TC4 titanium alloy and is formed by integral machining.

[0157] like Figure 42 and Figure 43 As shown, the left side plate 13 is rectangular in shape, with three rectangular openings and one circular opening processed in the thickness direction, and four triangular bosses 13-1 processed around one side of the circular opening, and the three rectangular openings include a small rectangular opening 13-2.

[0158] The left side plate 13 is made of TC4 titanium alloy and is formed by integral machining.

[0159] like Figure 44 、 Figure 45 and Figure 46 As shown, the rear panel 14 is rectangular in shape, with two rectangular openings and two circular openings processed in the thickness direction, and four triangular bosses processed around one side of the circular opening, and four 2mm deep depressions 14-1 processed along the width direction of the rear panel 14 on the other side.

[0160] The rear panel 14 is made of TC4 titanium alloy and is formed by integral machining.

[0161] like Figure 47 、 Figure 48 and Figure 49 As shown, the panel 15 is rectangular in shape, with six rectangular openings processed in the thickness direction, 3mm high bosses processed around the rectangular openings on the upper surface of the panel 15, and 2mm deep depressions 15-1 processed around the rectangular openings on the lower surface of the panel 15.

[0162] The panel 15 is made of TC4 titanium alloy and is formed by integral machining.

[0163] like Figure 50 、 Figure 51 and Figure 52 As shown, the mounting plate 16 is rectangular in shape, with two circular openings processed in the thickness direction, and four triangular bosses processed around one side of one of the circular openings, and a 2mm deep depression 16-1 processed along the width direction of the mounting plate 16 on the other side.

[0164] The mounting plate 16 is made of TC4 titanium alloy and is formed by integral machining.

[0165] like Figure 53As shown, the transverse rib 17 is in the shape of an arch bridge, and a U-shaped groove 17 - 1 is processed above the straight edge in the longitudinal direction of the transverse rib 17 .

[0166] The transverse rib 17 is made of TC4 titanium alloy and is formed by integral machining.

[0167] like Figure 54 As shown, the longitudinal reinforcement 18 is similar in appearance to the transverse reinforcement 17, and a U-shaped groove 18-1 is processed below the straight edge of the longitudinal reinforcement 18 in the longitudinal direction.

[0168] The longitudinal rib 18 is made of TC4 titanium alloy and is formed by integral machining.

[0169] It is understandable that the large-size titanium alloy structural part 100 is a typical welded component. Due to its large external dimensions and high requirements for its form and position tolerances, the use of conventional argon arc welding will face two major problems. One is that the welding deformation of the product after welding cannot be controlled, and the other is that the weld penetration depth cannot meet the product use requirements. Therefore, a reasonable welding method must be used in the product production process to overcome the problem that traditional methods cannot achieve product production.

[0170] The present application has made a breakthrough in the optimization design of the welding joint. The assembly welding of structural parts completely breaks the traditional welding method of butt joints or corner joints, and directly changes the traditional butt joints or corner joints into V-shaped plug joints. A boss about 10 mm high is grown on the lower surface of the base plate 10 by 3D printing, and the boss is then processed into a ∨ shape, and the first to ninth ribs 9 at the corresponding docking positions are processed into a ∧ shape to match the ∨ shape on the boss. Laser welding is achieved through laser welding angle positioning during the welding process. This not only reduces the difficulty of assembling the base plate components, but also improves the assembly accuracy. In addition, it not only solves the problem of laser welding limitations, but also greatly reduces product welding deformation.

[0171] At the same time, the parts between the panel components are assembled in combination by processing, installing and sinking, which not only reduces the difficulty of assembling large structural parts, but also improves the assembly accuracy between the parts. In addition, according to the structural form of the structural parts, in order to further improve the accessibility of laser welding, the panel components are assembled and laser welded separately, and then welded in combination with the base plate components, which greatly improves the laser welding coverage inside the structural parts.

[0172] In particular, the grid ribs in the base plate assembly of the present application are combined and welded in a split combination manner, mainly because the grid ribs have a small number of grid units, a large size, and a regular shape, which makes it easy to adopt a combined welding method. This not only ensures the welding quality and deformation of the grid ribs, but also reduces product processing costs and shortens product processing cycles.

[0173] Specifically, the assembly and welding method of the large-sized titanium alloy structural member 100 includes the following steps:

[0174] (A) Bottom plate assembly (such as Figures 54-56 The pre-welding assembly steps for the base plate assembly shown in FIG. 1 include the following sub-steps:

[0175] (A1) Place the base plate 10 on the welding platform with the surface with the grid V-grooved surface facing upwards;

[0176] (A2) Adjust the positions of the fourth rib 4 and the eighth rib 8 so that the sides with the ∧-shaped chamfers on the width ends of the fourth rib 4 and the eighth rib 8 face downward, and place the fourth rib 4 and the eighth rib 8 in the V-shaped grooves on the bottom plate 10 in sequence.

[0177] (A3) Adjust the positions of the seventh rib 7, the sixth rib 6, and the fifth rib 5 so that the sides with the ∧-shaped chamfer at one width end of the seventh rib 7, the ∧-shaped chamfer at one width end of the sixth rib 6, and the ∧-shaped chamfer at one width end of the fifth rib 5 face downward, and place the seventh rib 7, the fifth rib 5, and the sixth rib 6 in the V-shaped groove on the bottom plate 10 in sequence, while ensuring that the U-shaped groove on the seventh rib 7 is plugged into place with the U-shaped groove on the fourth rib 4 and the U-shaped groove on the eighth rib 8, the U-shaped groove on the fifth rib 5 is plugged into place with the U-shaped groove on the fourth rib 4 and the U-shaped groove on the eighth rib 8, and the U-shaped groove on the sixth rib 6 is plugged into place with the U-shaped groove on the fourth rib 4 and the U-shaped groove on the eighth rib 8;

[0178] (A4) Adjust the first rib 1, second rib 2, third rib 3, and fourth rib 4 so that the sides with the single-sided chamfer at one width end of the first rib 1, the single-sided chamfer at one width end of the second rib 2, the single-sided chamfer at one width end of the third rib 3, and the ∧-shaped chamfer at one width end of the fourth rib 4 face downward. Place the first rib 1, second rib 2, third rib 3, and fourth rib 4 in the V-shaped grooves around the bottom plate 10 in that order.

[0179] (A5) Adjust the position of each rib to ensure that the two ends of the fourth rib 4 are inserted into the V-grooves in the thickness direction of the third rib 3 and the V-grooves in the thickness direction of the fourth rib 4, respectively; the two ends of the eighth rib 8 are inserted into the V-grooves in the thickness direction of the third rib 3 and the V-grooves in the thickness direction of the fourth rib 4, respectively; the two ends of the seventh rib 7 are inserted into the V-grooves in the thickness direction of the first rib 1 and the V-grooves in the thickness direction of the second rib 2, respectively.

[0180] The two ends of the fifth rib 5 are respectively inserted into the V-shaped groove in the thickness direction of the first rib 1 and the V-shaped groove in the thickness direction of the second rib 2, and the two ends of the plate VI are respectively inserted into the V-shaped groove in the thickness direction of the first rib 1 and the V-shaped groove in the thickness direction of the second rib 2. At the same time, ensure that the two ends of the second rib 2 are respectively inserted into the depression in the thickness direction of the third rib 3 and the depression in the thickness direction of the fourth rib 4, and the two ends of the first rib 1 are respectively inserted into the depression in the thickness direction of the third rib 3 and the depression in the thickness direction of the fourth rib 4;

[0181] (A6) Use several arch clamps to fasten the bottom plate 10 and the first to fourth ribs 1 to 4;

[0182] (B) The tack welding step comprises the following sub-steps:

[0183] (B1) Adjust the laser welding robot so that the laser welding gun head forms a 45° angle with the horizontal direction;

[0184] (B2) Laser welding is performed to weld all V-shaped joints between the bottom plate 10 and the first to fourth ribs 1 to 4. The weld length is required to be approximately 100 mm and the weld spacing is approximately 200 mm.

[0185] (B3) Adjust the laser welding robot so that the laser welding gun head is parallel to the horizontal direction;

[0186] (B4) Laser welding is performed to weld all horizontal joints between the bottom plate 10 and the first to fourth ribs 1 to 4 and the vertical joints formed between the first to fourth ribs 1 to 4 (e.g. Figure 58 The laser welding of the fourth rib 4 and the bottom plate 10 shown in the figure requires a tack weld length of about 100 mm and a weld spacing of about 300 mm, wherein the tack weld length of the vertical butt joint formed between the first rib 1 to the fourth rib 4 is 50 mm to 80 mm;

[0187] (B5) Laser welding is used to position the right-angle weld formed by interlocking the first to fourth ribs 1 to 4. The length of the positioning weld is required to be 50 mm to 80 mm.

[0188] (B6) After positioning welding is completed, remove all fastened bow clips;

[0189] (C) A continuous welding step, comprising the following sub-steps:

[0190] (C1) Laser welding continuously welds the first to fourth ribs 1 to 4 to form a right-angle welded portion after being plugged into each other;

[0191] (C2) Adjust the laser welding robot so that the laser welding gun head forms a 45° angle with the horizontal direction;

[0192] (C3) Laser welding continuously welds all V-shaped joints between the bottom plate 10 and the first to fourth ribs 1 to 4;

[0193] (C4) Adjust the laser welding robot so that the laser welding gun head is parallel to the horizontal direction;

[0194] (C5) laser welding continuously welds all horizontal joints between the bottom plate 10 and the outside of the first to fourth ribs 1 to 4 and the vertical joints formed between the first to fourth ribs 4;

[0195] (C6) Adjust the laser welding robot so that the laser welding gun head is perpendicular to the horizontal direction;

[0196] (C7) Laser welding continuously welds all horizontal joints between the bottom plate 10 and the upper surfaces of the first to fourth ribs 1 to 4;

[0197] (D) Manual argon arc welding step, including the following sub-steps:

[0198] (D1) Using an electric rotary file, grind all V-shaped butt joints that could not be welded by laser welding in step (C) into V-shaped welding grooves, mainly at the intersections formed between the first rib plate 1 to the fourth rib plate 4;

[0199] (D2) All V-shaped butt joints that cannot be welded by laser welding in step (C) of manual argon arc welding;

[0200] (D3) manual argon arc welding of the right-angle welding portion formed by mutually inserting the first to fourth ribs 1 to 4;

[0201] (E) heat treatment and subsequent mechanical processing steps, including the following sub-steps:

[0202] (E1) After the bottom plate assembly is welded, it is subjected to vacuum heat treatment to release welding residual stress;

[0203] (E2) Processing the bottom margin, front margin and front installation depression of the bottom plate 10;

[0204] (F) Panel components (such as Figure 57 The pre-welding assembly steps for the panel assembly shown include the following sub-steps:

[0205] (F1) Place several channel steels on the welding platform, with all the channel steels at the same height and with the large surface facing upwards;

[0206] (F2) Place the panel 15 on the welding platform with the depressed surface facing upwards;

[0207] (F3) Adjust the position of the longitudinal and transverse ribs 18 and 17 so that the straight edges of the longitudinal and transverse ribs 18 and 17 face downward. Place the longitudinal and transverse ribs 18 and 17 in the depressions on the panel 15, ensuring they are properly assembled. Ensure that the U-shaped grooves on the transverse ribs 17 are properly inserted into the U-shaped grooves on the longitudinal ribs 18. Fasten the panel 15, longitudinal ribs 18, and transverse ribs 17 with the bow clips.

[0208] (F4) Adjust the position of the mounting plate 16 so that the depressed end of the mounting plate 16 in the width direction faces downward, and ensure that the depressed side of the mounting plate 16 faces the transverse rib 17;

[0209] (F5) Place the mounting plate 16 in the depression on the panel 15, ensuring that one end of the transverse rib 17 is embedded in the depression on the mounting plate 16. Fasten the panel 15 and the mounting plate 16 with a bow clip.

[0210] (F6) Adjust the position of the front panel 11 so that the end of the front panel 11 with the depressed width is facing downward, and the depressed side of the front panel 11 faces the longitudinal rib 18; adjust the position of the right side panel 12 so that the end of the right side panel 12 with the depressed width is facing downward, and the depressed side of the right side panel 12 faces the transverse rib 17; adjust the position of the left side panel 13 so that the side with the four triangular bosses in the thickness direction of the left side panel 13 faces outward, and the small rectangular opening on the left side panel 13 faces upward; adjust the position of the rear panel 14 so that the end of the rear panel 14 with the depressed width is facing downward, and the depressed side of the rear panel 14 faces the longitudinal rib 18;

[0211] (F7) Place the right side panel 12, left side panel 13, front panel 11, and rear panel 14 into the depressions around panel 15 in sequence;

[0212] (F8) Adjust the positions of the front panel 11, right side panel 12, left side panel 13, and rear panel 14 to ensure that the mounting plate 16, longitudinal ribs 18, right side panel 12, and left side panel 13 fit into the corresponding depressions in the front panel 11 and rear panel 14, respectively; and that one end of the transverse rib 17 fits into the corresponding depression in the right side panel 12.

[0213] (F9) Use bow clips to fasten the panel 15, front panel 11, right side panel 12, left side panel 13, rear panel 14, panel 15, mounting plate 16, horizontal ribs 17, and longitudinal ribs 18;

[0214] (G) Position welding step, including the following sub-steps:

[0215] (G1) Laser welding is used to tack weld the four vertical joints on the outside of the front panel 11, the right side panel 12, the left side panel 13 and the rear panel 14. The tack weld length is required to be about 100 mm and the weld spacing is about 200 mm.

[0216] (G2) Laser welding is used to tack weld four vertical right-angle welds inside the front panel 11, right side panel 12, left side panel 13 and rear panel 14. The tack weld length is required to be approximately 100 mm and the weld spacing is approximately 200 mm.

[0217] (G3) Laser welding is used to tack weld the internal vertical right-angle welds formed between the front panel 11, right side panel 12, left side panel 13, rear panel 14, panel 15, mounting plate 16, transverse rib 17, and longitudinal rib 18. The tack weld length is required to be approximately 100 mm, and the weld spacing is approximately 200 mm.

[0218] (G4) Laser welding is used to tack weld the external horizontal joints formed between the panel 15, the front panel 11, the right side panel 12, the left side panel 13 and the rear panel 14. The tack weld length is required to be approximately 100 mm and the weld spacing is approximately 300 mm.

[0219] (G5) Laser welding is used to tack weld the internal horizontal right-angle welds formed between the panel 15, the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14, the panel 15, the mounting plate 16, the transverse ribs 17, and the longitudinal ribs 18. The tack weld length is required to be approximately 100 mm, and the weld spacing is approximately 300 mm.

[0220] (G6) After positioning welding is completed, remove all fastened bow clips;

[0221] (H) A continuous welding step, comprising the following sub-steps:

[0222] (H1) Laser welding continuously welds four vertical right-angle welding locations inside the front panel 11, right side panel 12, left side panel 13 and rear panel 14;

[0223] (H2) Laser welding continuously welds the internal vertical right-angle welds formed between the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14, the panel 15, the mounting plate 16, the transverse ribs 17, and the longitudinal ribs 18;

[0224] (H3) Laser welding continuously welds the internal horizontal right-angle welds formed between the panel 15, the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14, the panel 15, the mounting plate 16, the transverse ribs 17 and the longitudinal ribs 18;

[0225] (H4) Laser welding continuously welds all horizontal joints on the upper surfaces of the panel 15, the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14, the panel 15, the mounting plate 16, the transverse ribs 17, and the longitudinal ribs 18;

[0226] (I) The pre-welding assembly step of the panel assembly and the base assembly includes the following sub-steps:

[0227] (I1) Adjust the position of the bottom plate assembly so that the side with the welded ribs faces upwards;

[0228] (I2) Hoist the bottom plate assembly to the position just above the rear opening of the panel assembly;

[0229] (I3) Adjust the position of the bottom panel assembly to ensure that the front panel 11, right side panel 12, left side panel 13, rear panel 14 and mounting plate 16 can be smoothly inserted into the depression on the bottom panel 10 and assembled in place;

[0230] (I4) Fasten with the bow card base plate assembly and the panel assembly;

[0231] (J) Position welding step, including the following sub-steps:

[0232] (J1) Laser welding is used to weld the four horizontal joints between the bottom plate 10 and the outer sides of the front panel 11, right side panel 12, left side panel 13 and rear panel 14. The weld length is required to be about 100 mm and the weld spacing is about 300 mm.

[0233] (J2) After positioning welding is completed, remove all fastened bow clips;

[0234] (K) The structural member flipping step includes the following sub-steps:

[0235] (K1) Prepare to flip the sling and clamp it;

[0236] (K2) Use a truss crane and a tilting sling to flip the structural member 180°;

[0237] (K3) Place several channel steels on the welding platform, requiring all channel steels to be at the same height and with the large surface facing upwards;

[0238] (K4) Place the structural members on the channel steel;

[0239] (K5) Dismantle the tilting sling;

[0240] (L) Position welding step, including the following sub-steps:

[0241] (L1) Laser welding is used to weld the internal horizontal right-angle welds between the bottom plate 10 and the front panel 11, right side panel 12, left side panel 13, rear panel 14, and mounting plate 16. The weld length is required to be approximately 100 mm and the weld spacing is approximately 300 mm.

[0242] (M) A continuous welding step, comprising the following sub-steps:

[0243] (M1) Laser welding continuously welds the internal horizontal right-angle welding parts formed between the bottom plate 10 and the front panel 11, the right side panel 12, the left side panel 13, the rear panel 14 and the mounting plate 16;

[0244] (M2) Laser welding of continuous welding of external joints of structural parts;

[0245] (N) Manual argon arc welding step, including the following sub-steps:

[0246] (N1) All right-angle welding parts inside the structure by manual argon arc welding (e.g. Figure 60 The right-angle welding portion of the seventh rib 7 and the eighth rib 8 shown, or Figure 61 The right-angle welding position of the fifth rib 5 and the first rib 1 shown);

[0247] It should be noted that in step (C), all V-shaped butt joints and right-angle welding parts that cannot be welded by laser welding are welded by manual argon arc welding, and the remaining parts are welded by laser welding.

[0248] In step (N), all right-angle welding locations inside the structural parts are performed by manual argon arc welding.

[0249] Compared with the related art, this application has at least the following technical effects:

[0250] The welding method of the present application is based on laser welding. The welding groove and assembly method of the connection parts are optimized according to the product structure. It can ensure that the laser welding can be carried out smoothly and the weld depth is ensured at the same time. It effectively solves the problems of difficult assembly before welding of large-sized titanium alloy structural parts 100, large welding deformation and limited laser welding. The structural parts welded by the present application have good weld formation quality after laser welding and small welding deformation. After the product is welded, it is tested that the local maximum flatness of the structural parts is about 0.985mm. After completing the stress relief vacuum heat treatment, it is tested again and the flatness is reduced to about 0.612mm. The post-weld accuracy is 2mm lower than the expected flatness, which effectively avoids the product from being unable to meet the subsequent mechanical processing requirements due to excessive welding deformation, and creates good conditions for the welding of large-sized titanium alloy structural parts 100.

[0251] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0252] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0253] In this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0254] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0255] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0256] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for assembling and welding large-size titanium alloy structural parts, characterized in that: A titanium alloy large-size structural part (100) comprises: a base plate assembly, the base plate assembly comprising a base plate (10) and at least six ribs, the ribs being plugged into the base plate (10) in a vertical direction, the base plate (10) being constructed as a square plate, four of the ribs being respectively installed on four sides of the base plate (10) to define an installation space, the remaining ribs being located in the installation space and being plugged into each other, a plurality of V-shaped grooves being provided on the upper surface of the base plate (10), and a ∧-shaped chamfer being provided at one end of the width of the ribs. The assembly and welding method of the titanium alloy large-size structural part comprises: placing the base plate (10) on a welding platform with the upper surface of the base plate (10) facing upward; Adjust the positions of the plurality of ribs so that the side with the ∧-shaped chamfer at one width end of the rib faces downward, and sequentially insert the plurality of ribs into the plurality of V-shaped grooves respectively; Using a plurality of bow-shaped clips to fasten the plurality of ribs on the bottom plate (10); The ∧-shaped chamfers of the plurality of ribs are respectively positioned and welded to the plurality of V-shaped grooves.

2. The method for assembling and welding large-size titanium alloy structural parts according to claim 1, characterized in that: The positioning welding of the ∧-shaped chamfers of the plurality of ribs to the plurality of V-shaped grooves comprises: Adjust the laser welding robot so that the gun head of the laser welding robot forms a 45° angle with the horizontal direction; Laser welding is used to position weld each of the ∧-shaped chamfers and each of the V-shaped grooves at a V-shaped butt joint.

3. The method for assembling and welding large-size titanium alloy structural parts according to claim 1, characterized in that: The assembly and welding method of the titanium alloy large-size structural part also includes: After the ∧-shaped chamfers of the plurality of ribs are positioned and welded to the plurality of V-shaped grooves, continuous welding is performed, and the continuous welding includes: Adjust the laser welding robot so that the gun head of the laser welding robot forms a 45° angle with the horizontal direction; Laser welding continuously welds each of the ribs and the bottom plate (10) at a horizontal butt joint in a horizontal plane; The vertical butt joints of the two ribs connected to each other are continuously welded by laser welding in the vertical direction.

4. The method for assembling and welding large-size titanium alloy structural parts according to claim 3, characterized in that: The assembly and welding method of the titanium alloy large-size structural part further includes: performing heat treatment after the continuous welding, and the heat treatment includes: The base plate assembly is subjected to vacuum heat treatment to release welding residual stress.

5. The method for assembling and welding large-size titanium alloy structural parts according to claim 1, characterized in that: Also includes: After the ∧-shaped chamfers of the plurality of ribs are positioned and welded to the plurality of V-shaped grooves, the plurality of bow clips are removed.

6. The method for assembling and welding large-sized titanium alloy structural parts according to claim 5, characterized in that: The titanium alloy large-size structural component (100) further comprises: a panel assembly, the panel assembly comprising a panel (15), longitudinal ribs (18) and transverse ribs (17), the mounting surface of the panel (15) being provided with a depression for mounting the longitudinal ribs (18) and the transverse ribs (17), and the assembly and welding method of the titanium alloy large-size structural component further comprises: placing the panel (15) on the welding platform with the mounting surface of the panel (15) facing upward; Adjust the positions of the longitudinal ribs (18) and the transverse ribs (17) so that the ends with straight edges in the width direction of the longitudinal ribs (18) and the transverse ribs (17) face downward, and sequentially place the longitudinal ribs (18) and the transverse ribs (17) in the depression of the panel (15), while the first U-shaped groove on the transverse rib (17) and the second U-shaped groove on the longitudinal rib (18) are plugged into place; The panel (15), the longitudinal ribs (18) and the transverse ribs (17) are fastened using the bow clips.

7. The method for assembling and welding large-size titanium alloy structural parts according to claim 6, characterized in that: The titanium alloy large-size structural component (100) further comprises: a mounting plate (16), the mounting plate (16) having a rectangular shape, two circular openings processed in the thickness direction, four triangular bosses processed around one side of one of the circular openings, and a 2 mm deep depression processed along the width direction of the mounting plate (16) on the other side; The assembly and welding method of the titanium alloy large-size structural part also includes: Adjust the position of the mounting plate (16) so that the end of the mounting plate (16) that is sunken in the width direction faces downward, and ensure that the sunken side of the mounting plate (16) faces the transverse rib (17); The mounting plate (16) is placed in the depression on the panel (15), while ensuring that one end of the transverse rib (17) is embedded in the depression on the mounting plate (16), and the panel (15) and the mounting plate (16) are fastened with the bow clip.

8. The method for assembling and welding large-sized titanium alloy structural parts according to claim 7, characterized in that: The titanium alloy large-size structural component (100) further includes: a right side plate (12), a left side plate (13), a front panel (11) and a rear panel (14). The assembly and welding method of the titanium alloy large-size structural component further includes: Adjust the position of the front panel (11) so that the end of the front panel (11) that is sunken in the width direction faces downward, and ensure that the sunken side of the front panel (11) faces the longitudinal rib (18); Adjust the position of the right side plate (12) so that the end of the right side plate (12) that is sunken in the width direction faces downward, and ensure that the sunken side of the right side plate (12) faces the transverse rib (17); Adjust the position of the left side plate (13) so that the side with four triangular bosses in the thickness direction of the left side plate (13) faces outward, and ensure that the small rectangular opening on the left side plate (13) faces upward; The position of the rear panel (14) is adjusted so that the sunken end of the rear panel (14) in the width direction faces downward, and the sunken side of the rear panel (14) faces the longitudinal rib (18).

9. The method for assembling and welding large-sized titanium alloy structural parts according to claim 8, characterized in that: The assembly and welding method of the titanium alloy large-size structural part also includes: Sequentially placing the right side panel (12), the left side panel (13), the front panel (11), and the rear panel (14) into the depressions around the panel (15); Adjust the positions of the front panel (11), the right side panel (12), the left side panel (13) and the rear panel (14) to ensure that the ends of the length of the mounting plate (16), the longitudinal rib (18), the right side panel (12) and the left side panel (13) are respectively embedded in the corresponding depressions of the front panel (11) and the rear panel (14), and one end of the length of the transverse rib (17) is embedded in the corresponding depression of the right side panel (12).

10. The method for assembling and welding large-sized titanium alloy structural parts according to claim 9, characterized in that: The assembly and welding method of the titanium alloy large-size structural part also includes: Laser welding is performed to position weld the bottom plate (10) and four horizontal butt joints on the outside of the front panel (11), the right side panel (12), the left side panel (13) and the rear panel (14); Laser welding is performed to position weld the internal vertical right-angle welding portion formed between the front panel (11), the right side panel (12), the left side panel (13), the rear panel (14), the panel (15), the mounting plate (16), the transverse rib (17) and the longitudinal rib (18).

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