CN116984706A - Angle steel welding method and repairing method thereof - Google Patents

Abstract

The application discloses an angle steel welding method and a repairing method thereof, comprising the following steps: assembling angle steel to be butted according to preset requirements; controlling a welding gun to weld and fix the butt joint ends of the two angle steels; welding the backing layer, wherein a welding gun is controlled to adopt a web plate for arc welding; when the welding gun moves to the joint of the angle steel panel and the web plate, arc breaking and arc welding are adopted to leave an arc pit on the angle steel groove; rotating a welding gun, striking an arc at an arc receiving position, and welding a bottoming layer of a panel to be butted; and adopting a welding mode of welding a priming layer to sequentially weld the filling layer and the cover layer of the angle steel to be butted. The influence of the internal quality of the shaking welding seam of the welding gun is avoided, shrinkage holes are avoided from being generated at the arc stopping position, strip-shaped weld flash is avoided, and the welding quality of angle steel butt welding is improved.

Description

Angle steel welding method and repairing method thereof

Technical Field

The application relates to the technical field of welding, in particular to an angle steel welding method and a repairing method thereof.

Background

In the current ship building field, some ships use angle steel as a hull skeleton. In production, angle steel often adopts butt welding mode, and because angle steel's corner and panel thickness differ about 1.5 times, bring great degree of difficulty for the weldment work personnel, welding quality also is difficult to guarantee, and current angle steel's welding technique mainly has two kinds:

1. by adopting a mode of welding one side and back chipping the other side, the welding process of the method is complex, and the welding quality is difficult to control due to the distribution of welding layers at the corners of the angle steel, repeated arc stopping and starting at the corners of the angle steel and other reasons.

2. The common ceramic gasket is adopted to realize single-sided welding and double-sided forming, and the welding difficulty of the method mainly comprises the following steps:

(1) Continuous arc welding method: because the included angle of the two panels is 90 degrees, when the welding gun rotates from the panel 1 to the panel 2, the welding gun shakes due to larger rotation amplitude, so that the internal quality of a welding line is influenced, or the defects of liner falling, poor welding line forming, incomplete welding and the like are caused.

(2) The arc-break welding method comprises the following steps: after the panel 1 is welded, arc stopping is performed at the 90-degree joint of the two panels, then the welding gun is adjusted to be at an angle of the welded panel 2, shrinkage cavities can be generated at the arc stopping position, and the internal quality of the welding seam is affected.

(3) The welding seam on the back of the 90-degree joint of the two panels is easy to form strip-shaped weld flash, and the appearance forming and the X-ray detection qualification rate of the welding seam are affected.

Therefore, an angle steel welding method and a repairing method thereof are needed, and the welding quality and the welding efficiency are improved.

Disclosure of Invention

The embodiment of the application at least partially solves the technical problem of poor welding quality in the prior art by providing the angle steel welding method and the repairing method thereof, and realizes the improvement of the butt welding quality of angle steel.

In order to solve the above technical problems, the embodiment of the present application provides the following technical solutions:

a method of angle welding comprising:

assembling angle steel to be butted according to preset requirements;

controlling a welding gun to weld and fix the butt joint ends of the two angle steels;

controlling the welding gun to adopt a continuous arc welding web plate for backing; when the welding gun moves to the joint of the panel and the web plate of the angle steel, arc breaking and arc welding are adopted to leave an arc pit on the groove; rotating the welding gun, striking an arc at the arc receiving position, and welding the bottoming layer of the panel to be butted;

and the filling layer and the cover layer of the angle steel to be butted are welded in sequence by adopting the welding mode of the bottom layer welding.

Optionally, after welding the bottom layer of the panel to be butted, the method further includes:

and if the forming height of the welding seam at the connecting position exceeds a first threshold value, flattening the surplus Gao Damo.

Optionally, the step of assembling the angle steel to be docked according to the preset requirement specifically includes:

assembling angle steel to be butted based on a preset angle steel root gap, and aligning according to preset requirements;

and sticking the gasket at a preset position of the angle steel.

Optionally, before assembling the angle steel to be docked according to the preset requirement, the method further comprises:

cutting the two angle steels to exceed the allowance required by butt joint, and determining the root gap based on a preset formula.

Optionally, before assembling the angle steel to be docked according to the preset requirement, the method further comprises:

and prefabricating the groove based on the specification of the angle steel, and cleaning the welding seam.

Optionally, the step of controlling the welding gun to adopt continuous arc welding to weld the web priming layer specifically comprises the following steps:

and controlling the welding gun to adopt continuous arc welding, and welding the web plate bottoming layer according to preset current based on a zigzag strip conveying method.

Optionally, the step of welding the bottom layer of the panel to be butted specifically includes:

when welded to the end of the panel, arc interruption welding is adopted.

In a second aspect, a method for repairing a welding defect of angle steel is provided, including:

detecting welding defects of angle steel by utilizing X rays, and cutting a welding area containing the defective angle steel;

by using the angle steel welding method, the cut angle steel is welded in a vertical welding mode.

Optionally, in the step of welding by adopting continuous arc welding, the method further comprises:

and when the temperature of the molten pool exceeds a second threshold value, reducing the temperature of the molten pool to a preset temperature value by adopting a arc-breaking welding mode.

Optionally, the welding material adopts solid welding wires to weld the priming layer, and adopts flux-cored wires to weld the filling layer and/or the covering layer.

One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:

according to the application, different welding modes are adopted at different positions of the angle steel welding seam, so that the influence of welding gun shaking on the internal quality of the welding seam is avoided. Meanwhile, arc breaking and arc welding are adopted at the 90-degree joint of the panel and the web plate, an arc pit is left on the groove, shrinkage holes are avoided at the arc stopping position, a special liner for flat-bulb steel is adopted, long strip-shaped weld flash is avoided from being formed by a welding seam at the back of the 90-degree joint of the panel and the web plate, the appearance forming of the welding seam and the X-ray detection qualification rate are influenced, and therefore the welding quality of angle steel butt welding is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of an angle steel welding method provided by the application;

FIG. 2 is a schematic view of the positions of the gasket and the angle steel during the welding of the angle steel in the application;

FIG. 3 is a schematic view of the gasket and angle of the present application in another view during angle welding;

FIG. 4 is a schematic diagram of the modified gasket of the present application;

FIG. 5 is a schematic view of a welding track and angle steel in the present application;

FIG. 6 is a schematic view of a weld joint according to the present application.

Reference numerals: 1. angle steel; 11. a web; 12. a panel; 13. passing through the welding holes; 14. the lower edge of the angle steel; 15. a junction; 16. angle steel groove; 17. the upper edge of the angle steel; 2. a gasket; 3. a bottom layer is formed; 4. a filling layer; 5. and (3) a cover layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the term "connected" should be construed broadly, and may be a fixed connection, a removable connection, or an integral connection, for example; may be directly or indirectly through an intermediate medium, and the specific meaning of the terms in the present application will be understood by those skilled in the art in specific cases. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, and not limited to the technical solutions of the present application, and the embodiments of the present application and the technical features in the embodiments may be combined with each other without conflict.

In addition, the term "and/or" appearing herein is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:

different welding modes are adopted at different positions of the welding seam of the angle steel 1, so that the influence of welding gun shaking on the internal quality of the welding seam is avoided. Meanwhile, arc breaking and arc welding are adopted at the 90-degree joint 15 of the panel 12 and the web 11, an arc pit is reserved on the angle steel groove 16, shrinkage holes are avoided at the arc stopping position, a special ceramic liner for flat-bulb steel is adopted, strip-shaped weld flash is avoided from being formed by a welding seam at the back of the 90-degree joint of the panel and the web, the appearance forming of the welding seam and the X-ray detection qualification rate are influenced, and therefore the welding quality of butt welding of the angle steel 1 is improved.

In the embodiment of the application, there is provided an angle steel welding method as shown in fig. 1, which includes steps S101 to S104:

step S101, assembling angle steel 1 to be butted according to preset requirements;

before butt welding of the angle steel 1, the following preparation work is performed:

1. and determining the gap when the angle steels 1 are butted, cutting the allowance required by the butt joint of the two angle steels 1 in detail, and determining the root gap based on a preset formula. And the root gap is determined according to the specification of the angle steel 1. The preset formula is that the root gap is equal to half the thickness of the panel 12.

2. Prefabricating an angle steel groove 16 based on the specification of the angle steel 1, and cleaning welding seams. In detail, the angle of the angle steel groove 16 is determined according to the specification of angle steel, and is generally 15-30 degrees, and the primer, rust, water and oil stain on the two sides of the welding line within the range of 20MM are removed completely before welding.

3. And (5) placing the angle steel 1. In detail, based on a preset root gap, assembling angle steel 1 to be butted, and aligning according to preset requirements; the alignment requirement is mainly that the butt joint surfaces of two angle steels should be parallel, and the phenomena of uneven height, distortion and the like cannot be caused. The gap of the abutting surface should be uniform, and there should be no large gap or uneven gap. The edges of the butt joint surface should be straight and smooth, and should not have the phenomena of bending, warping and the like. If the butt joint surface of the two angle steels has defects such as holes, cracks and the like, the two angle steels should be repaired or replaced before welding. The welding seam can be uniformly and smoothly connected with the two angle steels. After alignment, the gasket 2 is stuck at a preset position of the angle steel 1. Wherein, the alignment needs to be fixed, namely the end of the panel 12 is fixed by using a horse plate, and the radius of the opening of the horse plate is consistent with the width of the angle steel groove 16. The liner 2 is attached to the back of the angle steel 1 by adopting a special liner for flat-bulb steel, and if the liner 2 is not long enough, the liner can be lengthened by adopting a common liner. In addition, at the position of the welding hole 13 below the welding line of the angle steel 1 (as shown in fig. 2 and 3), because the gasket 2 is wider and cannot be perfectly attached to the lower end face of the welding line, one section of the gasket 2 can be removed firstly, then the required width of the gasket 2 is placed at the corner of the angle steel 1, the gasket 2 is knocked into the required width by a slag knocking hammer (fig. 4), and then the gasket 2 is attached to the lower end face of the welding line by an aluminum foil tape.

Step S102, controlling a welding gun, and welding and fixing the butt joint ends of the two angle steels 1;

it should be noted that, the welding fixation of the butt joint end is to fix the spot welding at the groove of the welding hole, mainly to ensure that the arc can burn stably when the bottom layer of the web is welded. In addition, although the angle steel 1 is fixed by the horse plate, the fixing mode still can slightly shake, and the stability can be further ensured by adopting the spot welding mode so as to be positioned in the subsequent welding process, and meanwhile, the welding quality and efficiency are improved. Specifically, arc striking is carried out from the lower edge of a welding line of the angle steel 1 during welding, and a welding gun is controlled to weld the left end and the right end of the angle steel 1 together by adopting an arc breaking method.

Step S103, welding the primer layer 3: the control welding gun adopts a backing layer 3 of a continuous arc welding web 11; when the welding gun runs to the joint 15 between the panel 12 and the web 11, arc breaking and arc welding are adopted to leave an arc pit on the angle steel groove 16; and (3) rotating the welding gun, striking an arc at the arc receiving position, and welding the bottoming layer 3 of the panel 12 to be butted.

During welding, arc striking is performed from the lower edge 14 of the welding line of the angle steel 1, and the left end and the right end of the angle steel 1 are welded together by adopting an arc breaking method. And then, adopting continuous arc welding to weld the bottom layer 3 of the web 11, and determining the welding current according to a plate thickness comparison table. The arc is welded to the turning (namely the connecting position 15) of the web 11 and the panel 12, arc breaking and arc receiving are adopted, an arc pit is reserved on the angle steel groove 16, then the welding gun is controlled to rapidly rotate through 90 degrees to face the side face of the angle steel 1, arc striking is carried out at the arc receiving position, the welding of the panel 12 is started until the welding is carried out to the end face of the panel 12, and a horse plate is required to be additionally arranged at the end of the panel to ensure the stability of fixation. I.e. the upper edge 17 in fig. 5, arc closure by arc break welding.

Step S104, adopting a welding mode of welding the bottom layer 3 to sequentially weld the filling layer 4 and the cover layer 5 of the angle steel 1 to be butted.

It should be noted that, the strip transporting method is basically consistent with the bottom layer 3 when the filling layer 4 and the cover layer 5 are welded, only the quality of the welded joint at the corner of the angle steel 1 needs to be paid attention to, and the thickness and the layer number of the filling layer 4 are determined according to the thickness of the angle steel 1.

Further, after welding the primer layer 3 of the panels 12 to be butted, the method further comprises:

if the weld forming height of the joint 15 exceeds the first threshold, the remainder Gao Damo is flattened.

The weld bead forming height is too high, which can affect the appearance quality and stress concentration of the weld bead caused by welding. Specifically, uneven welds may affect the overall effect, especially where post-processing or surface treatment is required, thereby polishing the remainder flat and improving the appearance quality. In addition, the surface of the welding seam can be leveled by polishing and leveling, and the stress concentration and the size of the force application area are reduced, so that the mechanical property of the welding seam is improved. Meanwhile, after the welding line is polished and leveled, the surface evenness is high, the finish is good, and subsequent processing and surface treatment such as machining, paint spraying and the like are facilitated.

Further, the step of controlling the welding gun to adopt the continuous arc welding web 11 to coat the bottom layer 3 specifically comprises the following steps:

the welding gun is controlled to adopt continuous arc welding, and the web plate 11 is welded to the bottom layer 3 according to preset current based on a zigzag strip conveying method.

It should be noted that, at the dashed line shown in fig. 5, the zigzag strip-conveying method is operated by continuously oscillating the end of the welding wire in zigzag and moving forward, and stopping for a while at both sides to prevent undercut defects. The mode is easy to operate, wide in application, and suitable for butt joint of flat welding, vertical welding and overhead welding, and is widely used for welding thicker steel plates. Thereby making welding more convenient.

Further, the step of welding the primer layer 3 of the panel 12 to be butted, specifically includes:

when welded to the end of the panel 12, arc closure is effected using arc break welding.

It should be noted that, the end of the panel is additionally provided with a horse plate to maintain stability, and arc breaking and arc welding are adopted in addition, so as to ensure the stability of the welding process and the quality of the welding result. If the arc is not properly received, an arc pit lower than the basic metal can be formed at the ending part of the welding line, and cracks are easy to occur. When the arc is temporarily stopped, the arc pit can be effectively filled by utilizing the arc-collecting function, and the continuity of the welding process and the quality of the welding result are ensured.

Based on the same inventive concept, the embodiment of the application provides a method for repairing welding defects of angle steel, which comprises the following steps:

detecting welding defects of the angle steel 1 by utilizing X rays, and cutting a welding area of the angle steel 1 with the defects; by using the welding method of the angle steel 1, the cut angle steel 1 is welded in a vertical welding mode.

If defects are found after the steel angle 1 is welded by X-ray detection, repairing the welded seam, cutting the original welded seam and the fusion areas on two sides, eliminating the welding defects, and then welding, wherein the gap of the welded seam can reach about 15-30 MM, the width of a ceramic liner 2 commonly used in hull welding is only 20-30 MM, and the welding seam forming and quality can be seriously affected by the following three conditions when the common flux-cored wire is adopted for welding: (1) the gap is too large, and the liquid molten pool flows from two sides of the root of the angle steel groove 16; (2) the gap is too large, heat of welding can be accumulated in the angle steel groove 16, and a molten pool can flow downwards from the middle; (3) too large a gap, too much welding wire is melted in the angle groove 16, so that slag is increased, and the welding arc is difficult to burn normally.

Therefore, the embodiment adopts a method of solid welding wire backing welding and flux-cored wire filling cover welding, and adopts a special liner for flat-bulb steel at the inner corner of the angle steel 1, and the corner of the liner 2 is a round bar (as shown in fig. 2), so that the liner can be better attached to the corner of the angle steel 1, and the welding seam at the corner is formed more smoothly. Taking 100X60X8 angle steel 1 as an example, the concrete steps are as follows:

the upper end of the angle steel 1 is fixed by a horse plate, the diameter of an opening of the horse plate is equal to the width of a welding line, and the lower end of the angle steel 1 can be directly fixed on a ship body in a spot mode. The upper end face and the lower end face of the angle steel 1 are respectively provided with an angle steel groove of 15-30 degrees.

Bonding of liner 2 is shown in fig. 2, and welding parameters are shown in table 1:

	welding wire diameter (MM)	WeldingCurrent (A)	Arc voltage (V)
				Priming layer	1.2	60～100	17～23.5
Filling, covering layer	1.2	120～180	22～28

TABLE 1

The welding process comprises the steps of firstly welding a bottom layer 3 weld joint, after welding parameters are adjusted, striking an arc from the lower edge 14 of the angle steel 1, adopting a broken arc welding mode, after the weld joint is established on the liner 2 of the lower edge 14, starting to weld the angle steel 1 by adopting a zigzag strip conveying method (the broken line position in fig. 5), slightly stopping at two sides, after the root parts of the angle steel grooves 16 at two sides are melted, moving to the other direction, if the temperature of a molten pool is too high in the welding process, properly adopting a broken arc welding mode to reduce the temperature of the molten pool at the middle part, but the pause time is not too long, otherwise, easily forming shrinkage holes, welding to the corner/connecting position 15 (fig. 5) of the angle steel 1, adopting a repeated broken arc mode to receive arcs, and leaving arc receiving points at the angle steel grooves 16, then rapidly rotating the body by 90 DEG to face the side of the angle steel 1, striking arcs from the arc receiving points of the angle steel grooves 16, starting to weld the angle steel 1 flat welding, and carrying the strip conveying method and the arcs at two sides with the same stay time as the vertical welding until the outer edge of the panel 12 of the angle steel 1 is welded, and the broken arc receiving is adopted, and the bottom layer 3 is welded.

And (3) polishing defects at the arc-collecting and arc-striking joints of the welding line of the priming layer 3, determining whether to weld the filling layer 4 according to the thickness of the angle steel 1 (figure 6), wherein the thickness and the layer number of the filling layer 4 are determined according to the thickness of the angle steel 1, and the strip conveying method is basically the same as that of the priming layer 3. The welding seam of the cover layer 5 is the same as the welding method of the filling layer 4, and only the quality of the welding joint at the corner of the angle steel 1 needs to be paid attention to.

After the welding is finished, if the welding seam at the turning part in the angle steel 1 is too high in molding (such as the position between the cylindrical liner 2 and the angle steel 1 in fig. 2), a steel grinding head or a grinding machine can be used for flattening the surplus Gao Damo, so that the quality of X-ray flaw detection is easier to be ensured, and the welding process is finished. Through the repairing method, the welded or repaired butt welding seams of the angle steel 1 are all primary sheets through X-ray inspection, and powerful references are provided for welding similar structures.

And when the temperature of the molten pool exceeds a second threshold value, reducing the temperature of the molten pool to a preset temperature value by adopting a arc-breaking welding mode.

The arc-breaking welding method is adopted to reduce the temperature of the molten pool, and aims to effectively control the temperature of the molten pool in a proper range through arc breaking, avoid defects caused by overhigh temperature and improve welding quality.

Further, the welding material adopts a solid welding wire to weld the bottom layer 3, and adopts a flux-cored wire to weld the filling layer 4 and/or the cover layer 5.

The solid wire is suitable for welding materials such as low carbon steel, low alloy steel and cast iron, and the flux-cored wire is suitable for welding various steels including high-strength steel, high carbon steel and the like. Therefore, the mode can adapt to the welding requirements of the priming layer 3 of various materials, and the adaptability is improved.

Meanwhile, solid welding wires are adopted for backing welding, so that a compact and smooth welding surface can be obtained, and the strength and toughness of a welding joint can be ensured by flux-cored wire filling cover welding. Therefore, this method can obtain a high-quality welding effect. Meanwhile, because the solid welding wire has high deposition speed, the time for filling the welding line is shorter, and the flux-cored wire has higher deposition speed and shorter time for filling the welding line. It can also improve the welded production efficiency. It should be noted that, in this embodiment, the proposed welding method of the angle steel 1 or the repair method of the welding defect thereof may be performed manually or automatically. Wherein the automation is carried out as follows:

and establishing track coordinates based on the L-shaped track of the angle steel 1, and controlling the mechanical arm to move along the track coordinates. For welding modes at different positions, such as a zigzag strip conveying method, only the swing position, speed and stay time of the welding gun are required to be set. And based on the established track, when the welding gun is identified to reach the joint 15, arc breaking and arc receiving are adopted, the arc breaking position is recorded, and after the welding gun turns, the welding is continued from the arc breaking position. When the repeated arc breaking ending method is needed, when welding is carried out to the end point (namely the end point coordinate is determined), repeated arc quenching-arc starting is carried out for a plurality of times in the arc pit until the arc pit is filled. It should be noted that when the mechanical arm is used for welding the L-shaped angle steel, the continuous welding from the web plate to the panel can be directly performed without stopping arc at the joint. It can be seen that the method can also be implemented by directly establishing an automatic operation system.

The application is described with reference to a method flow diagram in accordance with an embodiment of the application. It will be understood that each of the flows in the flowchart may be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (10)

1. A method of welding angle steel, the method comprising:

assembling angle steel to be butted according to preset requirements;

controlling a welding gun to weld and fix the butt joint ends of the two angle steels;

controlling the welding gun to adopt a continuous arc welding web plate for backing; when the welding gun moves to the joint of the panel and the web plate of the angle steel, arc breaking and arc welding are adopted to leave an arc pit on the groove; rotating the welding gun, striking an arc at an arc receiving position, and welding a bottoming layer of the panel to be butted;

and adopting a welding mode of welding the priming coat to sequentially weld the filling layer and the cover layer of the angle steel to be butted.

2. The method of claim 1, wherein prior to assembling the angle steel to be docked according to the preset requirements, the method further comprises:

and prefabricating the groove based on the specification of the angle steel, and cleaning the welding seam.

3. The method of claim 1, wherein prior to assembling the angle steel to be docked according to the preset requirements, the method further comprises:

and cutting the two angle steels to exceed the allowance required by butt joint, and determining the root gap based on a preset formula.

4. The method according to claim 1, wherein the step of assembling the angle steel to be docked according to the preset requirements comprises the following steps:

assembling angle steel to be butted based on a preset root gap, and aligning according to the preset requirement;

and sticking the gasket at a preset position of the angle steel.

5. The method of claim 1, wherein the step of controlling the welding gun to weld the web substrate using tandem arc welding comprises:

and controlling the welding gun to adopt continuous arc welding, and welding the web plate bottoming layer according to preset current based on a zigzag strip conveying method.

6. The method according to claim 1, wherein the step of welding the primer layer of the panels to be butted, in particular comprises:

when welded to the end of the panel, arc is struck with arc break welding.

7. The method of claim 1, wherein after the welding the bottom layer of the panels to be butted, the method further comprises:

and if the forming height of the welding seam at the joint exceeds a first threshold value, flattening the surplus Gao Damo.

8. A repairing method for angle steel welding defects is characterized in that,

detecting welding defects of angle steel by utilizing X rays, and cutting a welding area containing the defective angle steel;

the angle steel welding method according to any one of claims 1 to 7 is used for welding the cut angle steel by means of vertical welding.

9. The method of claim 8, wherein the step of welding the web using tandem arc welding further comprises:

and when the temperature of the molten pool exceeds a second threshold value, reducing the temperature of the molten pool to a preset temperature value by adopting a arc-breaking welding mode.

10. The method of claim 8, wherein the welding material is primer welded with solid wire and the filler layer and/or cover layer is welded with flux-cored wire.