A mobile welding apparatus and deck welding method

Abstract

The present application belongs to the field of ship welding technology, and discloses a mobile welding device and a deck welding method. The mobile welding device comprises a mobile vehicle body, a guide assembly, a first welding gun assembly and a second welding gun assembly. The top wheels at the front and rear ends of the mobile vehicle body respectively abut the linear outer edge of the main deck, and the top wheels can roll and walk along the linear outer edge of the main deck, are not easy to be separated from the linear outer edge of the main deck, are not easy to deviate when the mobile vehicle body moves, are beneficial to improve the straightness of welding, the first welding gun and the second welding gun can simultaneously perform welding work, one straight walking of the mobile vehicle body can simultaneously form two welds, is beneficial to improve the efficiency of welding, reduces the number of reciprocating walking, and the first welding gun support and the second welding gun support are slidably connected with the mobile track, improving the use flexibility. The deck welding method uses the above mobile welding device, has high welding construction efficiency, has less return frequency and slag cleaning frequency, and is fully automatically welded throughout, which is beneficial to improve the welding quality.

Description

Technical Field

[0001] This invention relates to the field of ship welding technology, and more particularly to a mobile welding device and a deck welding method. Background Technology

[0002] The side section structure of a container ship, such as Figure 1 As shown, it is welded from the main deck 100, longitudinal bulkhead 101, hatch coaming web 102 and outer plate 103. Due to the large thickness of the above plates and the complex stress in the area, deep penetration welding is generally required by processing bevels.

[0003] like Figure 2 and Figure 3 As shown, the existing welding method involves installing and welding the main deck 100 and longitudinal bulkhead 101 in a side-lying state with the outer plate 103 as the base surface in sections on the side. Then, the prefabricated hatch coaming web 102 is hoisted as a whole to the main deck 100 area for installation and welding. That is, the welding of the main deck 100 and longitudinal bulkhead 101 and the hatch coaming web 102 are carried out in two different stages, and all welding is carried out using flux-cored wire CO2 semi-automatic welding.

[0004] Because the dimensions H of the main deck 100 extending beyond the longitudinal bulkhead 101 and hatch coaming 102 are relatively small (15mm~20mm), the existing automated fillet welders only have one welding torch. The horizontal top wheel is in perpendicular contact with the main deck surface, and the horizontal top wheel cannot fully reach the main deck. Especially when welding the cover layer welds, the contact area between the horizontal top wheel and the main deck is reduced due to the weld reinforcement. The fillet welder often deviates and cannot continue welding, affecting the welding quality and efficiency. In addition, the existing rail-type welding equipment requires marking and laying of special rails first, and then removing and transporting the rails after welding. The process is extremely complicated, with a large amount of preparation work before and after welding. Manual welding involves many back-and-forth trips and is labor-intensive. The weld quality depends on the skill level of the workers. Each worker or equipment can only weld one weld at a time, requiring multiple back-and-forth trips, resulting in low welding efficiency and many weld joints. Summary of the Invention

[0005] The purpose of this invention is to provide a mobile welding device and a deck welding method to solve the problems of poor deck weld quality and low welding efficiency.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On the one hand, a mobile welding device is provided, comprising:

[0008] A mobile vehicle body, on which a mobile track is provided;

[0009] The guide assembly is provided in two sets, which are respectively installed at both ends of the mobile vehicle body. The guide assembly includes a top wheel beam and a top wheel. The top wheel is installed on the top wheel beam and can abut against the straight outer edge of the main deck.

[0010] The first welding torch assembly includes a first welding torch bracket and a first welding torch, wherein the first welding torch bracket is slidably mounted on the moving track, and the first welding torch is mounted on the first welding torch bracket;

[0011] The second welding torch assembly includes a second welding torch bracket and a second welding torch. The second welding torch bracket is slidably mounted on the moving track, and the second welding torch is mounted on the second welding torch bracket.

[0012] Optionally, the first welding torch holder includes a first column and a first sliding sleeve fitted on the first column. The first column is slidably connected to the moving track, and a first support rod is provided on the first sliding sleeve. The first welding torch is slidably connected to the first support rod.

[0013] Optionally, the second welding torch holder includes a second column and a second sliding sleeve fitted on the second column. The second column is slidably connected to the moving track, and a second support rod is provided on the second sliding sleeve. The second welding torch is slidably connected to the second support rod.

[0014] Optionally, the first welding torch is inclined toward the direction of the second welding torch, forming an angle α with the first direction, 60°≤α≤70°; the second welding torch is inclined toward the direction of the first welding torch, forming an angle β with the first direction, 70°≤β≤80°; the distance L between the welding end of the first welding torch and the welding end of the second welding torch is 20mm≤L≤30mm.

[0015] Optionally, the extension length of the top wheel crossbeam at the forward end of the mobile vehicle body is less than the extension length of the top wheel crossbeam at the rear end of the mobile vehicle body.

[0016] Optionally, it also includes a motor and a rechargeable battery, the motor providing driving force to the mobile vehicle body and the rechargeable battery providing power to the motor.

[0017] On the other hand, a deck welding method is provided, using the aforementioned mobile welding equipment, comprising the following steps:

[0018] Step S1: Assemble the main deck, longitudinal bulkheads and hatch coamings. The longitudinal bulkheads and hatch coamings are placed in the horizontal direction with the structural surfaces of the longitudinal bulkheads and hatch coamings facing downwards. The main deck is placed in the vertical direction and clamped between the longitudinal bulkheads and hatch coamings.

[0019] Step S2: Weld the hatch coaming web structure to the main deck and the longitudinal bulkhead structure to the main deck.

[0020] Step S3: Use mobile welding equipment to complete the welding of the root pass weld between the non-structural surface of the longitudinal bulkhead and the main deck, as well as the welding of the root pass weld between the non-structural surface of the hatch coaming and the main deck.

[0021] Step S4: Use mobile welding equipment to complete the welding of the filler weld between the non-structural surface of the longitudinal bulkhead and the main deck, as well as the welding of the filler weld between the non-structural surface of the hatch coaming and the main deck.

[0022] Step S5: Use mobile welding equipment to complete the welding of the non-structural surface of the longitudinal bulkhead and the cover surface between the main deck, as well as the welding of the non-structural surface of the hatch coaming and the cover surface between the main deck.

[0023] Optionally, the deck welding method further includes:

[0024] Step S6: 24 hours after welding is completed, magnetic particle inspection is performed on the weld.

[0025] Optionally, the first welding torch uses solid welding wire for CO2 gas shielded welding, and the second welding torch uses flux-cored welding wire for CO2 gas shielded welding. During the welding process, the purity of CO2 gas is not less than 99.5%.

[0026] Optionally, the welding current of solid wire is 200A to 220A and the welding voltage is 24V to 26V; the welding current of flux-cored wire is 240A to 260A and the welding voltage is 28V to 30V.

[0027] The beneficial effects of this invention are:

[0028] In this mobile welding equipment, the top wheels at both ends of the mobile vehicle body abut against the straight outer edge of the main deck. The top wheels can roll along the straight outer edge of the main deck and are not easy to detach from the straight outer edge of the main deck. The mobile vehicle body is not easy to deviate when moving, which helps to improve the straightness of welding. The first welding torch and the second welding torch can perform welding work at the same time. The mobile vehicle body can weld two welds at the same time in one straight movement, which helps to improve welding efficiency and reduce the number of back-and-forth movements. The first welding torch support and the second welding torch support are slidably connected to the mobile track, which improves the flexibility of the use of the first welding torch and the second welding torch.

[0029] The aforementioned mobile welding equipment was used in the deck welding method. This method has high welding efficiency, reduces the number of welding round trips and slag removal by 50%, and is fully automated throughout the process. It does not require manual hand operation, has fewer welding joints, and the main deck 100, longitudinal bulkhead 101, and hatch coaming web 102 are welded synchronously and alternately. The preparation time is short and the welding efficiency is high. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of an existing container ship side section;

[0031] Figure 2 yes Figure 1 Welding diagram at point A Figure 1 ;

[0032] Figure 3 yes Figure 1 Welding diagram at point A Figure 2 ;

[0033] Figure 4 This is a schematic diagram of the structure of the mobile welding equipment described in an embodiment of the present invention;

[0034] Figure 5 yes Figure 4 A magnified view of a portion of point B in the middle;

[0035] Figure 6 This is a cross-sectional schematic diagram of the top wheel according to an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram illustrating the use of the mobile welding equipment described in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 1 ;

[0038] Figure 9 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 2 ;

[0039] Figure 10 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 3 ;

[0040] Figure 11 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 4 ;

[0041] Figure 12 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 5 ;

[0042] Figure 13 This is a schematic diagram of the operation process of the deck welding method described in the embodiments of the present invention. Figure 6 .

[0043] In the picture:

[0044] 1. Moving vehicle body; 11. Moving track;

[0045] 2. Guide assembly; 21. Top wheel crossbeam; 22. Top wheel;

[0046] 3. First welding torch assembly; 31. First welding torch bracket; 311. First column; 312. First sliding sleeve; 3121. First support rod; 32. First welding torch;

[0047] 4. Second welding torch assembly; 41. Second welding torch bracket; 411. Second column; 412. Second sliding sleeve; 4121. Second support rod; 42. Second welding torch;

[0048] 100. Main deck; 101. Longitudinal bulkhead; 1011. Structural surface of longitudinal bulkhead; 1012. Non-structural surface of longitudinal bulkhead; 102. Hatch coaming web; 1021. Structural surface of hatch coaming web; 1022. Non-structural surface of hatch coaming web; 103. Outer plating. Detailed Implementation

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0052] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0053] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0054] like Figures 4-7 As shown, the present invention provides a mobile welding device, including a mobile vehicle body 1, a guide assembly 2, a first welding torch assembly 3, and a second welding torch assembly 4. The mobile vehicle body 1 is provided with a moving track 11; the guide assembly 2 has two sets, respectively installed at the front and rear ends of the mobile vehicle body 1, and includes a top wheel beam 21 and a top wheel 22. Optionally, the extension length of the top wheel beam 21 is adjustable, allowing adjustment of the extension length according to the on-site operation conditions. The top wheel 22 is installed on the top wheel beam 21 and can abut against the straight outer edge of the main deck 100. The first welding torch assembly 3 includes a first welding torch bracket 31 and a first welding torch 32. The first welding torch bracket 31 is slidably installed on the moving track 11, and the first welding torch 32 is installed on the first welding torch bracket 31. The second welding torch assembly 4 includes a second welding torch bracket 41 and a second welding torch 42. The second welding torch bracket 41 is slidably installed on the moving track 11, and the second welding torch 42 is installed on the second welding torch bracket 41.

[0055] In use, the top wheels 22 at the front and rear ends of the mobile vehicle 1 are respectively abutted against the straight outer edge of the main deck 100. The top wheels 22 can roll along the straight outer edge of the main deck 100 and are not easy to detach from the straight outer edge of the main deck 100. The mobile vehicle 1 is not easy to deviate when moving, which helps to improve the straightness of welding. The first welding torch 32 and the second welding torch 42 can perform welding work at the same time. The mobile vehicle 1 can weld two welds at the same time in one straight movement, which helps to improve welding efficiency and reduce the number of back-and-forth movements. Furthermore, the first welding torch bracket 31 and the second welding torch bracket 41 are slidably connected to the mobile track 11, and the positions of the first welding torch bracket 31 and the second welding torch bracket 41 can be flexibly adjusted according to the needs, so that the positions of the first welding torch 32 and the second welding torch 42 are adjustable, which improves the flexibility of use of the first welding torch 32 and the second welding torch 42.

[0056] Furthermore, such as Figure 4 and Figure 5As shown, the first welding torch holder 31 includes a first column 311 and a first sliding sleeve 312 fitted onto the first column 311. The first sliding sleeve 312 can move up and down along the first column 311 and rotate horizontally 360° for adjustment. After adjustment, it can be locked in place. The first column 311 is slidably connected to the moving track 11. A first support rod 3121 is provided on the first sliding sleeve 312. The first welding torch 32 is slidably connected to the first support rod 3121 and can move along the first support rod 3121 and rotate 360° for adjustment. The second welding torch holder 41... It includes a second column 411 and a second sliding sleeve 412 fitted on the second column 411. The second sliding sleeve 412 can move up and down along the second column 411 and rotate horizontally 360° for adjustment. After adjustment, it can be locked and fixed. The second column 411 is slidably connected to the moving track 11. The second sliding sleeve 412 is provided with a second support rod 4121. The second welding torch 42 is slidably connected to the second support rod 4121 and can move along the second support rod 4121 and rotate 360° for adjustment, so as to improve the flexibility of the first welding torch 32 and the second welding torch 42.

[0057] Furthermore, such as Figure 5 As shown, in this embodiment, the first welding torch 32 is inclined toward the direction closer to the second welding torch 42, and is inclined toward the first direction (i.e., Figure 5 The second welding torch 42 is inclined toward the direction of the first welding torch 32, forming an angle α with the direction shown in the straight line, where 60°≤α≤70°; the second welding torch 42 is inclined toward the direction of the first welding torch 32, and is inclined toward the direction of the first direction (i.e., the direction shown in the straight line). Figure 5 An angle β is formed between the welding ends of the first welding torch 32 and the second welding torch 42 (in the direction shown by the straight line), with a value of 70°≤β≤80°; the distance L between the welding ends of the first welding torch 32 and the second welding torch 42 is 20mm≤L≤30mm. This welding torch angle and distance ensure that the welding arc of the second welding torch 42 arrives just as the weld seam welded by the first welding torch 32 is in a high-temperature state after solidification, which can fully melt the near-surface of the weld seam produced by the first welding torch 32, ensuring good fusion between weld beads. At the same time, it can prevent the electromagnetic fields generated by the first welding torch 32 and the second welding torch 42 from interfering with each other, ensuring the relative stability of the welding arc.

[0058] Furthermore, in this embodiment, along the forward direction of the mobile vehicle body 1, the extension length of the top wheel crossbeam 21 at the forward end of the mobile vehicle body 1 is less than the extension length of the top wheel crossbeam 21 at the rear end of the mobile vehicle body 1, so that during the movement of the mobile vehicle body 1, the forward end of the mobile vehicle body 1 generates pressure that moves closer to the main deck 100, so that the relative position of the mobile vehicle body 1 and the main deck 100 remains unchanged during the movement.

[0059] Furthermore, the mobile welding equipment also includes a motor and a rechargeable battery. The motor provides driving force to the mobile vehicle body 1. At least one wheel is provided at each of the four corners of the mobile vehicle body 1. The motor provides driving force to rotate the wheels. The rechargeable battery provides power to the motor. The rechargeable battery is removable and can be cyclically charged for use.

[0060] Furthermore, in this embodiment, the top wheel 22 structure is as follows: Figure 6 As shown, the top wheel 22 is preferably a grooved top wheel, which makes full contact with the edges of the main deck 100 at 90°, providing guidance for the movement of the vehicle body.

[0061] In addition, this embodiment also provides a deck welding method using the aforementioned mobile welding equipment, comprising the following steps:

[0062] Step S1: Assemble the main deck 100, longitudinal bulkhead 101 and hatch coaming web 102. The longitudinal bulkhead 101 and hatch coaming web 102 are placed in the horizontal direction, with the longitudinal bulkhead structural surface 1011 and the hatch coaming web structural surface 1021 facing downwards. The main deck 100 is placed in the vertical direction and clamped between the longitudinal bulkhead 101 and the hatch coaming web 102.

[0063] Specifically, in step S1 above, as Figure 8 and Figure 9 As shown, first assemble the main deck 100, longitudinal bulkhead 101, and hatch coaming web 102. Then switch the welding position of the weld seam to the flat welding position, that is, place the outer plate 103 of the side section horizontally as the base surface, with the longitudinal bulkhead 101 and hatch coaming web 102 in a horizontal position. The structural surface 1011 of the longitudinal bulkhead and the structural surface 1021 of the hatch coaming web face downwards, and the non-structural surface 1012 of the longitudinal bulkhead and the non-structural surface 1022 of the hatch coaming web face upwards. (Structural surface and non-structural surface are professional terms in the field. The side with structural components is called the structural surface, and the side without structural components is called the non-structural surface. If both sides are equipped with components, the side with the main component is the structural surface. For details, please refer to the prior art.) After preparation, proceed to step S2.

[0064] Step S2: Weld the hatch coaming web structure 1021 to the main deck 100 and the longitudinal bulkhead structure 1011 to the main deck 100.

[0065] Specifically, in step S2 above, as Figure 10 As shown, the gaps between the hatch cofferdam web structure surface 1021 and the main deck 100, and the gaps between the longitudinal bulkhead structure surface 1011 and the main deck 100 are first welded together. Manual flux-cored wire CO2 gas shielded welding is used for welding to ensure the welding accuracy of the main deck 100 area, especially the flatness of the hatch cofferdam web 102, to prevent the asymmetrical welding shrinkage stress generated by the non-structural surface weld from causing angular deformation of the hatch cofferdam web 102, and to reduce the occurrence of unqualified welding accuracy. After the main deck 100 is welded to the hatch cofferdam web structure surface 1021 and the longitudinal bulkhead structure surface 1011, the process proceeds to step S3.

[0066] Step S3, as follows Figure 11As shown in the attached document. Figure 7 The welding of the root pass weld between the non-structural surface 1012 of the longitudinal bulkhead and the main deck 100, as well as the root pass weld between the non-structural surface 1022 of the hatch coaming and the main deck 100, was completed using mobile welding equipment.

[0067] Specifically, in step S3 above, the mobile welding equipment is placed on the longitudinal wall panel structural surface 1011, such as... Figure 7 As shown, adjust the positions of the first welding torch 32 and the second welding torch 42 to perform the root pass weld between the main deck 100 and the longitudinal bulkhead structural surface 1011. When the mobile welding equipment moves from one end of the longitudinal bulkhead 101 to the other end, lift the mobile welding equipment and place it on the non-structural surface 1022 of the hatch cofferdam opposite to the welding end. Then, turn on the mobile welding equipment and perform the root pass weld between the main deck 100 and the non-structural surface 1022 of the hatch cofferdam in the opposite direction to the welding direction of the longitudinal bulkhead 101 until the welding reaches the end of the hatch cofferdam 102. Then, lift the welding trolley and place it opposite to the welding end to prepare for welding the filler weld between the main deck 100 and the longitudinal bulkhead 101.

[0068] Preferably, the relative positions of the two welding torches and welding wires in the left-right and up-down directions during the root pass welding are as follows: Figure 11 As shown, the first welding torch 32 uses solid wire for CO2 gas shielded welding (its weld surface is free of slag and does not require slag cleaning), while the second welding torch 42 uses flux-cored wire for CO2 gas shielded welding (its weld surface has slag and requires slag cleaning). During welding, the purity of the CO2 gas is not less than 99.5%. Therefore, slag removal is easy for the root pass weld. The weld welded by the first welding torch 32 does not require slag removal. After welding with the second welding torch 42, the thickness and width of the root pass weld increase, and the slag covering its surface is reduced by the constraint of the base metal on both sides of the weld, making it easier to break and remove. Furthermore, while solid welding wire has high welding deposition efficiency, it produces a lot of metal spatter during welding, lacks slag coverage on the weld surface, and has poor weld surface formation quality. Flux-cored welding wire, on the other hand, has a stable welding arc, produces less metal spatter, has slag coverage on the weld surface for protection, and has excellent forming quality. The welding arc of the second welding torch 42 remelts and reshapes most of the weld near the surface of the first welding torch 32, resulting in good weld formation quality. The combined use of the two fully leverages the advantages of both solid and flux-cored welding wires, ensuring weld quality while significantly improving welding efficiency.

[0069] Step S4, as follows Figure 12As shown, after the root pass weld is completed, the filler welds between the non-structural surface 1012 of the longitudinal bulkhead and the main deck 100, as well as the filler welds between the non-structural surface 1022 of the hatch coaming web and the main deck 100, are completed using mobile welding equipment. The welding process of the mobile welding equipment is the same as in step S3. The relative positions of the two welding torches and welding wires in the left-right and up-down directions during filler weld welding are shown in [reference needed]. Figure 12 As shown, after the filling weld is completed, the welding of the cover weld is prepared.

[0070] Step S5, as follows Figure 13 As shown, after the cover weld is completed, the mobile welding equipment is used to complete the cover weld between the non-structural surface 1012 of the longitudinal bulkhead and the main deck 100, as well as the cover weld between the non-structural surface 1022 of the hatch coaming and the main deck 100. The welding process of the mobile welding equipment is the same as in step S3. For the relative positions of the two welding torches and welding wires in the left-right and up-down directions during filler weld welding, please refer to [reference needed]. Figure 13 As shown, the welding work is completed after the cover weld is finished.

[0071] Optionally, the above deck welding method also includes step S6, which is to perform magnetic particle testing on the weld 24 hours after welding is completed, and to perform 100% flaw detection on the weld surface to ensure that there are no cracks or defects.

[0072] Optionally, in the above-mentioned deck welding method, the welding current of the solid wire is preferably 200A to 220A, and the welding voltage is preferably 24V to 26V; the welding current of the flux-cored wire is preferably 240A to 260A, and the welding voltage is preferably 28V to 30V; the traveling speed of the welding carriage is preferably 16cm to 22cm / min; the wire extension length is preferably 10mm to 15mm; and the CO2 gas flow rate is preferably 15L to 20L / min.

[0073] In summary, the deck welding method of the present invention uses the aforementioned mobile welding equipment. This method has high welding efficiency, reduces the number of welding round trips and slag removal by 50%, is fully automated throughout the process, requires no manual hand operation, has a small number of welding joints, and allows for synchronous and alternating welding of the main deck 100, longitudinal bulkhead 101, and hatch coaming web 102. It also has short preparation time and high welding efficiency.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mobile welding device, characterized in that, include: A mobile vehicle body (1) is provided with a mobile track (11). The guide assembly (2) is provided in two sets, which are respectively installed at both ends of the mobile vehicle body (1). The guide assembly (2) includes a top wheel beam (21) and a top wheel (22). The top wheel (22) is installed on the top wheel beam (21) and can abut against the straight outer edge of the main deck (100). The first welding torch assembly (3) includes a first welding torch bracket (31) and a first welding torch (32). The first welding torch bracket (31) is slidably mounted on the moving track (11), and the first welding torch (32) is mounted on the first welding torch bracket (31). The second welding torch assembly (4) includes a second welding torch bracket (41) and a second welding torch (42). The second welding torch bracket (41) is slidably mounted on the moving track (11), and the second welding torch (42) is mounted on the second welding torch bracket (41). The first welding torch (32) is inclined toward the direction of the second welding torch (42), forming an angle α with the first direction, 60°≤α≤70°; the second welding torch (42) is inclined toward the direction of the first welding torch (32), forming an angle β with the first direction, 70°≤β≤80°; the distance L between the welding end of the first welding torch (32) and the welding end of the second welding torch (42) is 20mm≤L≤30mm; The extension length of the top wheel crossbeam (21) at the forward end of the mobile vehicle body (1) is less than the extension length of the top wheel crossbeam (21) at the rear end of the mobile vehicle body (1); The extension length of the top wheel crossbeam (21) is adjustable.

2. The mobile welding equipment according to claim 1, characterized in that, The first welding torch holder (31) includes a first column (311) and a first sliding sleeve (312) fitted on the first column (311). The first column (311) is slidably connected to the moving track (11). A first support rod (3121) is provided on the first sliding sleeve (312). The first welding torch (32) is slidably connected to the first support rod (3121).

3. The mobile welding equipment according to claim 1, characterized in that, The second welding torch holder (41) includes a second column (411) and a second sliding sleeve (412) fitted on the second column (411). The second column (411) is slidably connected to the moving track (11). A second support rod (4121) is provided on the second sliding sleeve (412). The second welding torch (42) is slidably connected to the second support rod (4121).

4. The mobile welding equipment according to claim 1, characterized in that, It also includes a motor and a rechargeable battery, the motor providing driving force for the mobile vehicle body (1) and the rechargeable battery providing power to the motor.

5. A method for welding a deck, characterized in that, Using the mobile welding equipment according to any one of claims 1-4 includes the following steps: Step S1: Assemble the main deck (100), longitudinal bulkhead (101), and hatch coaming (102). The longitudinal bulkhead (101) and hatch coaming (102) are placed in the horizontal direction, with the structural surfaces (1011) of the longitudinal bulkhead and (1021) of the hatch coaming facing downwards. The main deck (100) is placed in the vertical direction and sandwiched between the longitudinal bulkhead (101) and the hatch coaming (102). Step S2: Weld the hatch coaming web structure surface (1021) to the main deck (100) and the longitudinal bulkhead structure surface (1011) to the main deck (100); Step S3: Use mobile welding equipment to complete the welding of the root pass weld between the non-structural surface (1012) of the longitudinal wall plate and the main deck (100), as well as the welding of the root pass weld between the non-structural surface (1022) of the hatch coaming web plate and the main deck (100); Step S4: Use mobile welding equipment to complete the filling weld between the non-structural surface (1012) of the longitudinal wall plate and the main deck (100), as well as the filling weld between the non-structural surface (1022) of the hatch coaming web plate and the main deck (100). Step S5: Use mobile welding equipment to complete the welding of the cover weld between the non-structural surface (1012) of the longitudinal wall plate and the main deck (100), as well as the welding of the cover weld between the non-structural surface (1022) of the hatch coaming and the main deck (100).

6. The deck welding method according to claim 5, characterized in that, Also includes: Step S6: 24 hours after welding is completed, magnetic particle inspection is performed on the weld.

7. The deck welding method according to claim 5, characterized in that, The first welding torch (32) is used Solid wire for gas shielded welding, second welding torch (42) used Flux-cored welding wire for gas shielded welding, during the welding process The purity of all gases is not less than 99.5%.

8. The deck welding method according to claim 7, characterized in that, The welding current for solid wire is 200A to 220A, and the welding voltage is 24V to 26V; the welding current for flux-cored wire is 240A to 260A, and the welding voltage is 28V to 30V.

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