Composite welding method and apparatus for u-rib corner parts

Abstract

The present application relates to the technical field of welding, and particularly relates to a composite welding method and equipment for U rib angle parts, which comprises the following steps: assembling the U rib angle part to be welded at a preset position of a top plate; searching for a positioning welding area and welding parameters in a preset parameter mapping table according to specification information of the U rib angle part to be welded; performing gas shielded welding on a bevel of the U rib angle part to be welded according to the welding parameters in the positioning welding area, so that the U rib angle part to be welded is positioned and fixed with the top plate; and simultaneously performing laser welding and welding wire filling on the bevel of the U rib angle part to be welded according to the welding parameters, so that a double-sided weld is formed between the U rib angle part to be welded and the top plate. The composite welding method combining laser welding and welding wire filling is adopted, so that the positioning welding position and the whole weld achieve single-sided welding and double-sided forming penetration, and an additional weld of 4 mm can be formed inside, welding efficiency is improved, and the filling material during welding can be saved.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a composite welding method and equipment for U-rib corner parts. Background Technology

[0002] Currently, orthotropic plate bridge decks are a type of bridge deck structure that welds longitudinal U-shaped stiffeners, transverse stiffeners, and bridge deck welded plates into a whole to bear wheel loads. They have strong load-bearing capacity and are widely used in bridges.

[0003] However, the existing orthotropic plate U-shaped rib corners and top plate are connected by fillet welds, and the penetration depth is required to reach 80% of the thickness of the U-shaped rib. However, since the inside of the U-shaped rib is a closed space, welding is very difficult. Usually, special internal welding equipment is used for welding, but this method is costly, has low welding efficiency, and requires more materials.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a composite welding method and equipment for U-rib corner parts, aiming to solve the technical problems of difficult welding, low efficiency, and large material requirements for welding U-rib corner parts in the prior art.

[0006] To achieve the above objectives, the present invention provides a composite welding method for U-rib corner parts, the method comprising the following steps:

[0007] The U-rib corner parts to be welded are assembled in the preset positions on the top plate, wherein the assembly gap is 0 to 0.5 mm and the assembly natural angle is 13°.

[0008] Obtain the specification information of the U-rib corner part to be welded. Based on the specification information of the U-rib corner part to be welded, find the corresponding tack welding area and welding parameters in the preset parameter mapping table. The welding parameters include at least the welding wire diameter, welding wire extension length, wire feed speed, power density, welding speed, welding wire arc point position, and laser spot position. The vertical distance between the laser spot position and the bevel length direction is less than or equal to 2 mm, the horizontal distance between the laser spot position and the welding wire arc point position is less than or equal to 3 mm, the welding wire diameter is greater than or equal to 1.2 mm, and the welding speed is 900 mm / min.

[0009] Within the locating welding area, gas metal arc welding is performed on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the U-rib corner part to be welded is positioned and fixed with the top plate;

[0010] Laser composite welding is performed on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the welding area between the U-rib corner part to be welded and the top plate is fully melted to form a double-sided weld. The laser composite welding adopts a combination of laser welding and wire filler welding.

[0011] Optionally, after performing gas metal arc welding on the bevel of the U-rib corner part to be welded according to the welding parameters within the positioning welding area, so that the U-rib corner part to be welded is positioned and fixed with the top plate, the method further includes:

[0012] The U-rib corner part to be welded is subjected to a root pass welding according to the welding parameters, wherein the root pass welding adopts a combination of laser welding and wire filler welding.

[0013] Optionally, before performing gas metal arc welding on the bevel of the U-rib corner part to be welded according to the welding parameters within the positioning welding area, so that the U-rib corner part to be welded is positioned and fixed with the top plate, the method further includes:

[0014] The welding area between the U-rib corner part to be welded and the top plate is polished to expose a metallic luster in the welding area.

[0015] Optionally, after performing laser hybrid welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the welding area between the U-rib corner part to be welded and the top plate is fully penetrated to form a double-sided weld, the process further includes:

[0016] The double-sided weld is inspected according to a preset flaw detection depth to determine whether there are any defects in the double-sided weld.

[0017] When there are no defects in the double-sided weld, the welding of the U-rib corner part to be welded is confirmed to be complete.

[0018] Optionally, after determining whether the double-sided weld has defects, the method further includes:

[0019] When defects are found in the double-sided weld, the double-sided weld is repaired according to the flaw detection results. The process is then repeated to perform laser composite welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the welding area between the U-rib corner part to be welded and the top plate is fully melted to form a double-sided weld.

[0020] Optionally, before obtaining the specification information of the U-rib corner part to be welded, and searching for the corresponding tack welding area and welding parameters in a preset parameter mapping table based on the specification information of the U-rib corner part to be welded, the method further includes:

[0021] Based on the test data of the preset positioning welding area and the test data of the preset welding parameters, welding tests are performed on the U-rib corner parts of the preset specifications to obtain test result data, which includes the test result data of the positioning welding area and the test result data of the welding parameters.

[0022] Based on the test results data of the positioning welding area, the optimal positioning welding area corresponding to each preset specification is determined;

[0023] Based on the test results of the welding parameters, determine the optimal welding parameters corresponding to each preset specification;

[0024] Based on the preset specifications and the optimal locating welding area and optimal welding parameters corresponding to each preset specification, a preset parameter mapping table is established. The preset parameter mapping table reflects the correspondence between the optimal locating welding area, the optimal welding parameters and the specifications.

[0025] Optionally, the composite welding method for the U-rib corner component further includes:

[0026] During gas metal arc welding, protective gas is supplied according to a preset control sequence and a preset gas flow rate, wherein the preset gas flow rate is 15 to 25 L / min.

[0027] Optionally, the preset control timing sequence can be multiple control timing sequences, and the step of delivering protective gas according to the preset control timing sequence and preset gas flow rate includes:

[0028] The protective gas is continuously supplied to the welding area during the first control sequence and the second control sequence.

[0029] Optionally, after assembling the U-rib corner part to be welded into the preset position on the top plate, the method further includes:

[0030] Clean the welding area between the bevel of the U-rib corner part to be welded and the top plate to remove dirt, rust, moisture and oil stains;

[0031] The welding wire is dried, and the U-rib corner part to be welded and the top plate are preheated.

[0032] Furthermore, to achieve the aforementioned objective, the present invention also proposes a composite welding device for U-rib corner parts, wherein the composite welding device for U-rib corner parts applies the steps of the composite welding method for U-rib corner parts described above.

[0033] In this invention, the U-shaped rib corner part to be welded is assembled at a preset position on the top plate, and the specification information of the U-shaped rib corner part to be welded is obtained. According to the specification information of the U-shaped rib corner part to be welded, the corresponding positioning welding area and welding parameters are found in a preset parameter mapping table. Within the positioning welding area, gas metal arc welding is performed on the bevel of the U-shaped rib corner part to be welded according to the welding parameters, so that the U-shaped rib corner part to be welded is positioned and fixed with the top plate. Laser composite welding is performed on the bevel of the U-shaped rib corner part to be welded according to the welding parameters, so that the welding area between the U-shaped rib corner part to be welded and the top plate is fully melted to form a double-sided weld. Since the inside of the U-shaped rib is a closed space, welding is difficult. Traditional internal welding methods are costly, inefficient, and require more materials. This invention uses a laser composite welding method that combines laser welding and wire filler welding, so that the positioning welding position and the entire weld seam achieve single-sided welding and double-sided forming and penetration. In addition, an additional 4mm weld seam can be formed inside the U-shaped rib part, which ensures the welding effect and improves the welding efficiency. Furthermore, the welding area is smaller, which can save the filler material required for welding and save costs. Attached Figure Description

[0034] Figure 1 This is a schematic flowchart of the first embodiment of the composite welding method for U-rib corner parts of the present invention;

[0035] Figure 2 This is a schematic diagram of a fixing part in an embodiment of the composite welding method for U-rib corner parts of the present invention;

[0036] Figure 3 This is a schematic flowchart of the second embodiment of the composite welding method for U-rib corner parts of the present invention.

[0037] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0039] This invention provides a composite welding method for U-rib corner parts, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the composite welding method for U-rib corner parts of the present invention.

[0040] In this embodiment, the composite welding method for the U-rib corner component includes the following steps:

[0041] Step S10: Assemble the U-rib corner part to be welded into the preset position on the top plate.

[0042] It should be noted that the execution subject of this embodiment is a composite welding device for U-rib corner parts. This composite welding device for U-rib corner parts contains all the devices / equipment / instruments required to realize the composite welding method for U-rib corner parts, and the composite welding method for U-rib corner parts can be applied.

[0043] It is understood that the U-rib corner parts to be welded refer to the U-rib corner parts that need to be welded. Their size, specifications, and quantity can be determined according to actual needs, and this embodiment does not impose any restrictions on this. The preset position refers to the position of the parts to be welded, which is determined according to the actual situation, and this embodiment does not impose any restrictions on this. The assembly method between the U-rib corner parts and the top plate can be any feasible method, and this embodiment does not impose any restrictions on this.

[0044] It should be understood that in this embodiment, the U-rib corner parts to be welded are not beveled, and are directly assembled with the top plate. The assembly natural angle is about 13°, the assembly gap is 0 to 0.5 mm, the welding station is the boat-shaped position, and the angle of the boat-shaped position is 30 to 35°.

[0045] In specific implementations, such as Figure 2 As shown, adjust the position L between the U-rib corner part A and the top plate B according to the requirements, and assemble the U-rib corner part A onto the top plate B.

[0046] Step S20: Obtain the specification information of the U-rib corner part to be welded, and according to the specification information of the U-rib corner part to be welded, find the tack welding area and welding parameters corresponding to the specification information in the preset parameter mapping table.

[0047] It is understood that the specification information refers to the specifications of the U-rib corner parts to be welded, i.e., their size. Different U-rib corner parts have different specification information, which can be obtained by measuring the actual U-rib corner parts to be welded. The tack welding area refers to the area where tack welding is currently performed, and the welding parameters refer to the parameters used in the current welding process. The preset parameter mapping table refers to a pre-set mapping table used to determine the tack welding area and welding parameters. It reflects the correspondence between the optimal tack welding area, the optimal welding parameters, and the specifications. The optimal tack welding area is the optimal area for tack welding, and the optimal welding parameters are the best parameters used in the welding process. Each specification has a corresponding optimal tack welding area and optimal welding parameters. In this embodiment, the welding parameters used during welding are the optimal welding parameters determined by the specifications in the mapping table, and the tack welding area selected during tack welding is the optimal tack welding area determined by the specifications in the mapping table.

[0048] It should be understood that the welding parameters include at least the wire diameter, wire extension length, wire feed speed, welding current, arc voltage, power density, welding speed, wire arc point position, and laser spot position. In addition, parameters such as laser pulse waveform, laser pulse width, defocusing amount, wire tilt angle, and polarity may also be included, which can be adjusted according to actual conditions. This embodiment does not impose any limitations on these parameters. Specifically, the vertical distance between the laser spot position and the bevel length direction is less than or equal to 2 mm, the horizontal distance between the laser spot position and the wire arc point position is less than or equal to 3 mm, the wire diameter is greater than or equal to 1.2 mm, the welding speed is 900 mm / min, the wire extension length is 6 mm to 13 mm, and the (laser) power density can be 4800 W. Specific values ​​can be adjusted according to requirements, and this embodiment does not impose any limitations on these parameters. The welding wire used in this embodiment can be a metal-cored flux-cored wire, or other suitable types of welding wire can be used; this embodiment does not impose any limitations on these parameters.

[0049] In practice, based on the specific specifications of the U-rib corner parts that need to be welded, the corresponding optimal welding parameters and optimal locating welding area are found in the preset parameter mapping table in order to carry out subsequent welding.

[0050] Further, before step S20, the method includes: performing welding tests on U-rib corner parts of preset specifications based on preset positioning welding area test data and preset welding parameter test data to obtain test result data, wherein the test result data includes positioning welding area test result data and welding parameter test result data; determining the optimal positioning welding area corresponding to each preset specification based on the positioning welding area test result data; determining the optimal welding parameters corresponding to each preset specification based on the welding parameter test result data; and establishing a preset parameter mapping table based on the preset specifications and the optimal positioning welding area and optimal welding parameters corresponding to each preset specification, wherein the preset parameter mapping table reflects the correspondence between the optimal positioning welding area, the optimal welding parameters, and the specifications.

[0051] It should be noted that the preset tack weld area test data refers to some pre-set tack weld positions used to test the relationship between the tack weld area and the specifications. The preset welding parameter test data refers to some pre-set welding parameter values, such as: wire diameter, wire extension length, wire feed speed, power density, welding speed, wire arc point position, laser spot position, laser pulse waveform, laser pulse width, defocusing amount, wire tilt angle, etc., used to test the relationship between welding parameters and specifications. The preset specifications refer to the size of the U-rib corner part used for testing, usually set to common specifications. The test result data refers to the welding test results, i.e., the final welding effect, including tack weld area test result data and welding parameter test result data. The tack weld area test result data refers to the tack weld effect corresponding to different tack weld areas under different specifications, and the welding parameter test result data refers to the welding effect corresponding to different welding parameters under different specifications.

[0052] It is understandable that, since this embodiment uses two welding methods: gas metal arc welding (GMAW) and laser welding combined with wire filler welding (laser hybrid welding), the welding methods used in the test are also laser hybrid welding and GMAW, respectively. The corresponding test data are obtained, and the optimal parameters of laser hybrid welding and GMAW are selected and applied to laser hybrid welding and GMAW.

[0053] In practical implementation, for U-rib corner parts of different specifications, different welding parameters are used in different tack welding areas to implement gas metal arc welding and laser hybrid welding to obtain welding effects under different conditions. The optimal tack welding area for each specification and the optimal welding parameters under different welding methods are found, and a mapping table is established to reflect the correspondence between specifications, optimal welding parameters and optimal tack welding areas.

[0054] Step S30: Within the positioning welding area, perform gas metal arc welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the U-rib corner part to be welded is positioned and fixed with the top plate.

[0055] It should be understood that, during tack welding, this embodiment employs gas metal arc welding (GMAW) and uses optimal welding parameters to improve the stability of the tack welding.

[0056] Furthermore, after step S30, the method further includes: performing a root pass welding on the U-rib corner part to be welded according to the welding parameters, wherein the root pass welding adopts a combination of laser welding and wire filler welding.

[0057] In practice, before welding the U-rib corner parts to be welded using laser composite welding, a root pass is required to further ensure full penetration of the weld.

[0058] Furthermore, prior to step S30, the method further includes: grinding the welding area between the U-rib corner part to be welded and the top plate to expose the metallic luster in the welding area.

[0059] In practice, grinding the welding area before welding can improve the efficiency and quality of subsequent welding.

[0060] Step S40: Perform laser composite welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the welding area between the U-rib corner part to be welded and the top plate is fully melted to form a double-sided weld. The laser composite welding adopts a combination of laser welding and wire filler welding.

[0061] It should be noted that in the subsequent welding process, this embodiment employs a composite welding method combining laser welding and filler wire. During this process, due to the high penetration and deep penetration of laser welding, it can penetrate the root region of the bevel. The addition of filler wire ensures complete penetration, enabling double-sided forming even with single-sided welding. Furthermore, laser welding is fast and covers a smaller welding area, saving on filler material required for welding.

[0062] Understandably, weld leg size requirements must also be considered during laser composite welding to ensure welding quality.

[0063] It should be understood that in this embodiment, the arc point of the welding wire is less than or equal to 3mm in front of the laser spot, and can be greater than or equal to 1mm, so that the weld front formation will not be relatively concentrated and the positions will not be staggered due to the overlap of the arc point of the welding wire and the laser spot.

[0064] It should be noted that the welding area refers to the part of the U-rib corner part to be welded that contacts the top plate, which is usually the area that needs to be welded.

[0065] Furthermore, the composite welding method for the U-rib corner part further includes: during gas metal arc welding, supplying protective gas according to a preset control sequence and a preset gas flow rate, wherein the preset gas flow rate is 15 to 25 L / min.

[0066] It is understood that in gas metal arc welding (GMAW), the shielding gas used can be a mixed gas or pure carbon dioxide gas. The mixed gas includes carbon dioxide, for example, a 1:1 mixture of argon and carbon dioxide. Other ratios can also be used, and this embodiment does not impose any restrictions. Because carbon dioxide is used as the shielding gas, the space is non-oxidizing, preventing oxidation and reducing slag formation during welding. It also results in less spatter and a more aesthetically pleasing weld. The preset gas flow rate is the pre-set shielding gas delivery flow rate, which can be supplied by the welding machine. The welding machine nozzle diameter is 20mm, and the gas flow rate is 15 to 25 L / min, which can be adjusted according to actual conditions; this embodiment does not impose any limitations.

[0067] It should be understood that the preset control sequence refers to a pre-set protective gas delivery sequence, which can be a single sequence or multiple sequences. The control sequence can be controlled by a start switch; each activation of the start switch constitutes one control sequence. In this embodiment, two control sequences are used as examples of multiple control sequences. The first control sequence and the second control sequence are two consecutive sequences, and their durations are the same. When there are multiple preset control sequences, the delivery of protective gas according to the preset control sequence and preset gas flow rate includes: continuously delivering the protective gas to the welding area within the first and second control sequences.

[0068] In this embodiment, the specifications of the U-rib corner component to be welded are obtained by assembling it at a preset position on the top plate. Based on these specifications, the corresponding locating welding area and welding parameters are found in a preset parameter mapping table. Within the locating welding area, gas metal arc welding (GMAW) is performed on the bevel of the U-rib corner component according to the welding parameters, thus fixing the U-rib corner component to the top plate. Laser composite welding is then performed on the bevel of the U-rib corner component according to the welding parameters, resulting in complete penetration of the welding area between the U-rib corner component and the top plate, forming a double-sided weld. This embodiment employs a laser composite welding method combining laser welding and wire filler welding, achieving single-sided welding with double-sided penetration of the locating weld and the entire weld seam. Furthermore, an additional 4mm weld seam can be formed inside the U-rib component, ensuring welding quality while improving welding efficiency. Additionally, the smaller welding area saves on filler material and reduces costs.

[0069] refer to Figure 3 , Figure 3 This is a schematic flowchart of the second embodiment of the composite welding method for U-rib corner parts of the present invention.

[0070] Based on the first embodiment described above, after step S40, the method further includes:

[0071] Step S51: Perform flaw detection on the double-sided weld according to the preset flaw detection depth to determine whether there are defects in the double-sided weld.

[0072] It should be noted that the preset flaw detection depth refers to the pre-set detection depth, which is usually the thickness of the U-rib corner part.

[0073] It is understood that flaw detection can be non-destructive testing or phased array testing, and the choice can be made according to actual needs. This embodiment does not impose any restrictions on this.

[0074] Step S52: When there are no defects in the double-sided weld, confirm that the welding of the U-rib corner part to be welded is completed.

[0075] In practice, if no defects are detected within the preset flaw detection depth, the weld is considered qualified. Defects may include incomplete penetration, slag inclusion, porosity, cracks, etc.

[0076] Furthermore, after step S52, the method further includes: when there is a defect in the double-sided weld, repairing the double-sided weld according to the flaw detection results, and returning to perform laser composite welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that the welding area between the U-rib corner part to be welded and the top plate is fully melted to form a double-sided weld.

[0077] It should be understood that the flaw detection result refers to the result of flaw detection. If a defect is found during flaw detection, the flaw detection result will include the defect location and defect type, and rework can be carried out according to the defect location and defect type.

[0078] In practice, when defects are detected in the weld, timely repairs are necessary.

[0079] Furthermore, in order to prevent cracks or other phenomena after welding, in this embodiment, after step S10, the method further includes: cleaning the welding area between the bevel of the U-rib corner part to be welded and the top plate, removing dirt, rust, moisture and oil stains, drying the welding wire, and preheating the U-rib corner part to be welded and the top plate.

[0080] It should be understood that cracks may be caused by uneven heating or the presence of impurities. Therefore, after fixing, it is necessary to clean the bevel to remove stains and preheat the U-rib corner parts to ensure uniform heating during welding.

[0081] In this embodiment, after welding, the U-rib corner parts can be inspected to determine whether there are defects such as incomplete penetration, slag inclusion, porosity, and cracks. If defects are found within the preset inspection depth, they can be repaired in time. At the same time, preheating treatment is performed before welding to prevent cracks and further improve the welding quality.

[0082] Furthermore, to achieve the aforementioned objective, the present invention also proposes a composite welding device for U-rib corner parts, wherein the composite welding device for U-rib corner parts applies the steps of the composite welding method for U-rib corner parts described above.

[0083] It should be understood that the above are merely illustrative examples and do not constitute any limitation on the technical solutions of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any restrictions on this.

[0084] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.

[0085] In addition, for technical details not described in detail in this embodiment, please refer to the composite welding method for U-rib corner parts provided in any embodiment of the present invention, which will not be repeated here.

[0086] Furthermore, it should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0087] The sequence numbers of the embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0088] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory (ROM) / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0089] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A composite welding method of a U-rib corner part, characterized by, The method comprises the following steps: Assembling the U-rib corner part to be welded at a preset position of the top plate, wherein the assembly gap is 0-0.5 mm, and the natural assembly angle is 13°; Obtaining specification information of the U-rib corner part to be welded, and searching for a positioning welding area corresponding to the specification information and welding parameters of the U-rib corner part to be welded in a preset parameter mapping table according to the specification information of the U-rib corner part to be welded, wherein the welding parameters at least include a welding wire diameter, a welding wire extension length, a wire feeding speed, a power density, a welding speed, a welding wire arc point position, a laser spot position, a laser pulse waveform, a laser pulse width, a defocusing amount, a welding wire inclination angle, and polarity, wherein a vertical distance between the laser spot position and a bevel length direction is less than or equal to 2 mm, a horizontal distance between the laser spot position and the welding wire arc point position is less than or equal to 3 mm and greater than or equal to 1 mm, the welding wire diameter is greater than or equal to 1.2 mm, and the welding speed is 900 mm / min, and the welding wire extension length is 6-13 mm; Performing gas shielded arc welding on a bevel of the U-rib corner part to be welded in the positioning welding area according to the welding parameters, so that the U-rib corner part to be welded is positioned and fixed with the top plate; Performing single-sided laser composite welding on the bevel of the U-rib corner part to be welded according to the welding parameters, so that a welding area between the U-rib corner part to be welded and the top plate is fusion penetrated to form a double-sided weld, and an additional weld of 4 mm is formed inside the U-rib corner part to be welded, wherein the laser composite welding adopts a composite mode of laser welding and welding wire filling; Before the step of obtaining the specification information of the U-rib corner part to be welded and searching for the positioning welding area corresponding to the specification information and the welding parameters of the U-rib corner part to be welded in the preset parameter mapping table according to the specification information of the U-rib corner part to be welded, the method further comprises the following steps: performing welding test on U-rib corner parts of preset specifications according to preset positioning welding area test data and preset welding parameter test data, obtaining test result data, wherein the test result data includes positioning welding area test result data and welding parameter test result data, determining optimal positioning welding areas corresponding to each preset specification according to the positioning welding area test result data, determining optimal welding parameters corresponding to each preset specification according to the welding parameter test result data, establishing a preset parameter mapping table according to the preset specifications and the optimal positioning welding areas and the optimal welding parameters corresponding to each preset specification, and the preset parameter mapping table reflects a corresponding relationship among the optimal positioning welding areas, the optimal welding parameters and the specifications.

2. The composite welding method of U-rib corner parts according to claim 1, characterized by, After the step of performing gas shielded arc welding on the bevel of the U-rib corner part to be welded in the positioning welding area according to the welding parameters, so that the U-rib corner part to be welded is positioned and fixed with the top plate, the method further comprises the following steps: Performing backing welding on the U-rib corner part to be welded according to the welding parameters, wherein the backing welding adopts a composite mode of laser welding and welding wire filling.

3. The composite welding method of U-rib corner parts as set forth in claim 1, characterized by The melting electrode gas protection welding on the bevel of the U rib angle part according to the welding parameter before the U rib angle part and the top plate are fixed, further comprises: Grinding the welding area between the U rib angle part and the top plate to make the welding area leak out the metal luster.

4. The composite welding method of U-rib corner parts as set forth in claim 1, characterized by The single-sided laser composite welding on the bevel of the U rib angle part according to the welding parameter after the welding area between the U rib angle part and the top plate is penetrated to form the double-sided weld, further comprises: Detecting the double-sided weld according to the preset detection depth to determine whether the double-sided weld has defects; When the double-sided weld has no defects, confirming that the U rib angle part is welded.

5. The composite welding method of U-rib corner parts as claimed in claim 4, wherein The method for composite welding of the U rib angle part further comprises: When the melting electrode gas protection welding is performed, delivering the protection gas according to the preset control time sequence and the preset gas flow, and the preset gas flow is 15-25 L / min.

6. The composite welding method of U-rib corner parts as set forth in claim 2, characterized by The preset control time sequence is a plurality of control time sequences, and the delivering of the protection gas according to the preset control time sequence and the preset gas flow comprises: Continuously delivering the protection gas to the welding area in the first control time sequence and the second control time sequence.

7. The composite welding method of U-rib corner parts as claimed in claim 6, wherein The method for composite welding of the U rib angle part further comprises: After the U rib angle part is assembled at the preset position of the top plate, further comprising:

8. The composite welding method of U-rib corner pieces according to any one of claims 1 to 7, characterized by, Cleaning the welding area between the bevel of the U rib angle part and the top plate to remove the rust, moisture and oil stains; Drying the welding wire and preheating the U rib angle part and the top plate. The device applies the steps of the method for composite welding of the U rib angle part according to any one of claims 1-8.

9. A composite welding apparatus for U-rib corner parts, characterized by, ​

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