Arc length adjusting mechanism and welding equipment

Abstract

The utility model provides an electric arc length adjusting mechanism and welding equipment, the welding equipment comprises a welding torch and a welding head, the end part of the welding torch is a tungsten electrode, a welding wire, a welding rod or a nozzle, the electric arc length adjusting mechanism comprises a floating assembly connected with the welding torch, and the floating assembly and the welding torch are both connected with the welding head. The welding head is used for driving the floating assembly to move along the surface or the welding seam area of the to-be-welded workpiece, in the welding process, the floating assembly can be in contact with the surface or the welding seam area of the to-be-welded workpiece, and the distance between the end of the welding torch and the welding seam is kept unchanged. The welding torch is connected with the floating assembly, and the floating assembly is in contact with the surface of the to-be-welded workpiece or the welding seam area, so that the distance change between the end parts of a tungsten electrode, a welding wire, a welding rod or a nozzle and the like at each position and the welding seam is accurately and synchronously eliminated during welding, and the distance between the end part of the welding torch and the welding seam is always kept constant; therefore, the arc length is ensured to be constant, and the welding quality is further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to an arc length adjustment mechanism and welding equipment. Background Art

[0002] Due to the fact that the workpiece dimensions and the pre-welding assembly of the workpiece have a certain range of geometric tolerances, and the welding equipment itself has a certain structural gap, the distance between the end of the tungsten end of the welding torch or the ends of the welding torch wire, welding rod, nozzle, etc. (hereinafter referred to as the end of the welding torch) and the weld seam at different positions varies during welding, resulting in changes in the arc height. At present, the general method of welding is to adjust it through an arc voltage controller (hereinafter referred to as AVC). In the existing welding equipment, the AVC collects arc electrical signals, calculates and compares them inside the controller, outputs control signals, and drives the welding torch to rise and fall to change the height of the welding torch. However, due to factors such as torch swing and arc interference, the collected arc electrical signals often cannot feedback the actual welding torch height, making it difficult to accurately control the arc length, so that the distance between the end of the welding torch and the weld seam fluctuates within a range and cannot be guaranteed to be constant. At the same time, since a certain time period is required from arc collection to the lifting and lowering of the welding torch, AVC has a certain delay. Therefore, in some cases, the effect of AVC in maintaining a constant welding height is not ideal, resulting in poor welding effect and unguaranteed welding quality. Utility Model Content

[0003] The purpose of the embodiments of the utility model is to provide an arc length adjustment mechanism and a welding device, so as to solve the problem of poor welding quality caused by arc length change during welding in the prior art.

[0004] The embodiment of the utility model adopts the following technical solution: an arc length adjustment mechanism is applied to a welding device, the welding device includes a welding torch and a welding head, the end of the welding torch is a tungsten electrode, or a welding wire, or a welding rod, or a nozzle, and the arc length adjustment mechanism includes:

[0005] A floating assembly is connected to the welding torch, and both the floating assembly and the welding torch are connected to the welding head. The welding head is used to drive the floating assembly to move along the surface of the workpiece to be welded or the weld area. During the welding process, the floating assembly can maintain a contact relationship with the surface of the workpiece to be welded or the weld area, and the distance between the end of the welding torch and the weld remains unchanged.

[0006] In some embodiments, the arc length adjustment mechanism further includes a connecting frame;

[0007] The floating assembly comprises a cylinder, a first end of a piston rod of the cylinder abuts against a surface of a workpiece to be welded or a weld area, a second end of the piston rod is connected to the connecting frame, and the connecting frame is also connected to the welding torch;

[0008] The cylinder body of the cylinder is connected to the welding machine head.

[0009] In some embodiments, the arc length adjustment mechanism further includes a connecting frame;

[0010] The floating assembly comprises a cylinder, a first end of the cylinder body of the cylinder abuts against the surface of the workpiece to be welded or the weld area, a second end of the cylinder body is connected to the connecting frame, and the connecting frame is also connected to the welding torch;

[0011] The piston rod of the cylinder is connected to the welding machine head.

[0012] In some embodiments, the arc length adjustment mechanism further includes a positioning member, which is disposed at the first end of the piston rod, or the positioning member is disposed at the first end of the cylinder body, and the positioning member also abuts against the surface or weld area of ​​the workpiece to be welded.

[0013] In some embodiments, the positioning member is a positioning rod, one end of which is fixedly disposed on the first end of the piston rod, or one end of which is fixedly disposed on the first end of the cylinder body, and the other end of the positioning rod is against the surface or weld area of ​​the workpiece to be welded, and the positioning rod can slide on the surface or weld area of ​​the workpiece to be welded.

[0014] In some embodiments, the positioning member includes a ball or roller and a transition auxiliary member, and the ball or roller is connected to the first end of the piston rod through the transition auxiliary member, or the ball or roller is connected to the first end of the cylinder body through the transition auxiliary member, and the ball or roller is against the surface or weld area of ​​the workpiece to be welded, and the ball or roller can roll or rotate on the surface or weld area of ​​the workpiece to be welded.

[0015] In some embodiments, the floating component is an elastic member, and the elastic member is a spring, or rubber, or a rubber band.

[0016] In some embodiments, the arc length adjustment mechanism further includes a carrier plate;

[0017] When the weld of the workpiece to be welded is a circumferential weld, the floating assembly and the welding torch are both arranged on one surface of the supporting plate, and the welding head is connected to the other surface of the supporting plate. The welding head is used to drive the supporting plate to rotate, so as to drive the floating assembly and the welding torch arranged on the supporting plate to rotate circumferentially along the workpiece to be welded, thereby enabling the welding torch to perform welding.

[0018] An embodiment of the utility model further provides a welding device, comprising an arc length adjustment mechanism as described in any one of the above embodiments.

[0019] The beneficial effects of the embodiments of the utility model are:

[0020] By connecting the welding torch to the floating assembly, and keeping the floating assembly in contact with the surface of the workpiece to be welded or the weld area, the distance change between the end of the welding torch at each position and the weld can be accurately and synchronously eliminated during welding, and the distance between the end of the welding torch and the weld can be kept constant at all times, thereby ensuring the constant arc length and further ensuring the welding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a structural schematic diagram of the arc length adjustment mechanism (the floating component is a cylinder) in the first embodiment of the utility model;

[0023] Figure 2 For this utility model Figure 1 Left view of

[0024] Figure 3 For this utility model Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0025] Figure 4 For the utility model Figure 1 Schematic diagram of the structure of the middle cylinder;

[0026] Figure 5 This is a schematic diagram of the structure of the arc length adjustment mechanism (the floating component is a spring) in the utility model;

[0027] Figure 6 For this utility model Figure 5 Schematic diagram of the cross-sectional structure of the middle BB;

[0028] Figure 7 For the utility model Figure 5 Schematic diagram of the structure of the middle spring;

[0029] Figure 8 For the utility model Figure 5 Another structural diagram of the middle spring;

[0030] Fig. 9 For the utility model Figure 5 Another structural diagram of the middle spring.

[0031] Figure numerals: 1, welding head; 2, carrying plate; 3, connecting frame; 4, cylinder; 4-1, piston rod; 4-2, cylinder body; 5, welding torch; 6, tungsten electrode; 7, workpiece to be welded; 8, control valve body; 9, positioning piece; 10, spring; 11, connecting plate; 12, guide shaft; 13, stopper. DETAILED DESCRIPTION

[0032] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0033] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present application will occur to those skilled in the art.

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0035] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0036] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art will be able to readily implement many other equivalent forms of the present application.

[0037] The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.

[0038] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present application. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any suitable detailed structure.

[0039] This specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present application.

[0040] In order to solve the technical problems in the background technology, the utility model discloses an arc length adjustment mechanism, which is applied to welding equipment. The welding equipment includes a welding torch 5 and a welding head 1. The end of the welding torch is a tungsten electrode, or a welding wire, or a welding rod, or a nozzle, which can be selected and set according to actual production needs.

[0041] like Figure 1 , Figure 2 and Figure 3 As shown, the arc length adjustment mechanism includes a floating assembly, and the floating assembly is connected to the welding torch 5. Specifically, the floating assembly can form a combination with the welding torch 5, that is, the floating assembly and the welding torch 5 are synchronously moved. The floating assembly and the welding torch 5 are both connected to the welding head 1, or the combination of the floating assembly and the welding torch 5 is connected to the welding head. The welding head 1 is used to drive the floating assembly to move along the surface of the workpiece 7 to be welded or the weld area. The weld can be one of the conventional welds or a combination of two or more welds. For example, the weld can be at least one of the following welds:

[0042] Butt welds;

[0043] Fillet welds;

[0044] Girth weld;

[0045] Transverse welds;

[0046] longitudinal weld;

[0047] T-weld;

[0048] Lap welds;

[0049] Straight seam weld.

[0050] The welding head 1 is connected to the floating assembly and the welding torch 5. During the welding process, the floating assembly can maintain a contact relationship with the surface or weld area of ​​the workpiece 7 to be welded, and the distance between the end of the welding torch 5 and the surface or weld of the workpiece to be welded remains unchanged, that is, the distance between the tungsten electrode, or welding wire, or welding rod, or nozzle and the surface or weld of the workpiece 7 to be welded remains unchanged. That is, the floating assembly can self-adjust according to the deviation of the workpiece surface, and can always maintain a contact relationship with the surface or weld area of ​​the workpiece 7 to be welded. Because the welding torch 5 and the floating assembly are combined to form a combination that can move synchronously, therefore, when a depression or convexity occurs due to the deviation of the workpiece 7 to be welded, the welding torch 5 can move synchronously with the floating assembly, so that the distance between the end of the tungsten electrode, or welding wire, or welding rod, or nozzle of the welding torch 5 and the weld remains unchanged. It achieves accurate and synchronous elimination of the distance changes between the ends of the welding torch 5 at each position, such as the tungsten electrode, welding wire, welding rod, or nozzle, and the weld, and always keeps the distance between the ends of the welding torch 5, such as the tungsten electrode, welding wire, welding rod, or nozzle, and the weld constant, thereby ensuring the constant arc length and further ensuring the welding quality.

[0051] The embodiment of the utility model connects the welding torch 5 with the floating assembly, and the floating assembly maintains a contact relationship with the surface or weld area of ​​the workpiece 7 to be welded, so that when welding is performed, the distance change between the tungsten electrode, welding wire, welding rod, nozzle and other ends of the welding torch 5 at each position and the weld is accurately and synchronously eliminated, and the distance between the tungsten electrode, welding wire, welding rod, nozzle and other ends of the welding torch 5 and the weld is always kept constant, thereby ensuring the constant arc length and further ensuring the welding quality.

[0052] Moreover, the traditional AVC (arc voltage controller) is a complete set of electromechanical control mechanisms, including a motor automatic control unit and a welding torch 5 lifting mechanism, which has a complex structure, delayed response, and poor welding effect. Compared with the traditional AVC control method, the present invention has a simple structure, instant response, high precision, and good welding effect.

[0053] In the first embodiment, the arc length adjustment mechanism further includes a connecting frame 3, and the structure and size of the connecting frame 3 can be reasonably set according to the positions of the floating assembly and the welding torch 5, so as to connect and combine the floating assembly and the welding torch 5 to form a combined body. Holes can be set on the connecting frame 3 to reduce the weight of the connecting frame 3.

[0054] The floating assembly includes a cylinder 4, combined with Figure 4, the two ends of the piston rod 4-1 of the cylinder 4 extend from the two ends of the cylinder body 4-2 of the cylinder 4 respectively. Among them, the first end of the piston rod 4-1 is against the surface or weld area of ​​the workpiece 7 to be welded, and the second end of the piston rod 4-1 is connected to the connecting frame 3. The connecting frame 3 is also connected to the welding torch 5, for example, the connecting frame 3 is connected to the position of the welding torch 5 away from the end. When the piston rod 4-1 moves in the cylinder body 4-2, the positions of the first end and the second end of the piston rod 4-1 relative to the cylinder body 4-2 change synchronously. For example, the control valve body 8 of the cylinder 4 maintains ventilation, and controls the first end of the piston rod 4-1 to maintain contact with the surface or weld area of ​​the workpiece 7 to be welded. When the floating assembly moves to the position where the surface of the workpiece 7 to be welded has a protrusion, the first end of the piston rod 4-1 moves toward the cylinder body 4-2, and the second end of the piston rod 4-1 moves away from the cylinder body 4-2 at the same time, and the connecting frame 3 moves in the direction away from the cylinder body 4-2 together with the piston rod 4-1, and the welding torch 5 connected to the connecting frame 3 also moves in the direction away from the cylinder body 4-2 at the same time. Real-time adjustment is achieved, ensuring a constant distance between the ends of the tungsten electrode, welding wire, welding rod, or nozzle and the weld, that is, a constant arc length, solving the problems of adjustment delay and arc length change due to deviation in traditional adjustment methods.

[0055] The cylinder body 4-2 of the air cylinder 4 is connected to the welding head 1, and the relative position of the cylinder body 4-2 and the welding head 1 remains unchanged. That is, when the surface of the workpiece 7 to be welded or the weld area rises and falls, the cylinder body 4-2 does not move, and the piston rod 4-1 moves relative to the cylinder body 4-2, thereby adjusting the arc length during welding.

[0056] In the second embodiment, similar to the first embodiment, the arc length adjustment mechanism further includes a connecting frame 3. The structure and size of the connecting frame 3 can be appropriately adjusted according to the connection between the connecting frame 3 and the floating assembly.

[0057] The floating assembly includes a cylinder 4 , a first end of a cylinder body 4 - 2 of the cylinder 4 abuts against the surface or weld area of ​​a workpiece 7 to be welded, a second end of the cylinder body 4 - 2 is connected to a connecting frame 3 , and the connecting frame 3 is also connected to a welding torch 5 .

[0058] The piston rod 4 - 1 of the cylinder 4 is connected to the welding head 1 .

[0059] Different from the first embodiment, the connecting frame 3 is used as a connecting piece for connecting the welding torch 5 and the cylinder body 4-2, while the piston rod 4-1 is connected to the carrier plate 2, and the relative position of the piston rod 4-1 and the carrier plate 2 remains unchanged. When the surface of the workpiece to be welded or the weld area is up and down, the cylinder body 4-2 will move relative to the piston rod 4-1, thereby adjusting the arc length of the welding torch 5 during the welding process.

[0060] In some embodiments, the arc length adjustment mechanism further includes a positioning member 9, which is disposed at the first end of the piston rod 4-1, or the positioning member 9 is disposed at the first end of the cylinder body 4-2, and the positioning member 9 also abuts against the surface or weld area of ​​the workpiece 7 to be welded. The positioning member 9 can be securely in contact with the surface or weld area of ​​the workpiece 7 to be welded to improve the effect of the floating assembly.

[0061] In some embodiments, the positioning member 9 may be a positioning rod, which may be a long rod of a certain length or other shapes. One end of the positioning rod is fixedly arranged at the first end of the piston rod 4-1, or one end of the positioning rod is fixedly arranged at the first end of the cylinder body 4-2, and the other end of the positioning rod is against the surface of the workpiece 7 to be welded or the weld area.

[0062] The manufacturing material, shape and length of the positioning rod can be reasonably selected and set according to actual production needs.

[0063] In some embodiments, the positioning member 9 includes a ball or roller and a transition auxiliary member, the ball or roller is connected to the first end of the piston rod 4-1 through the transition auxiliary member, or the ball or roller is connected to the first end of the cylinder body 4-2 through the transition auxiliary member, the ball or roller is against the surface or weld area of ​​the workpiece 7 to be welded, and the ball or roller can roll or rotate on the surface or weld area of ​​the workpiece 7 to be welded.

[0064] That is, during the welding process of the workpiece 7 to be welded, the floating assembly can contact the surface or weld area of ​​the workpiece 7 to be welded through the ball or roller, and the ball or roller can roll or rotate on the surface or weld area of ​​the workpiece 7 to be welded, and minimize the scratching of the surface or weld area of ​​the workpiece 7 to be welded. The material and size of the ball or roller can also be reasonably selected and set according to actual production needs.

[0065] Before preparing for welding, first ventilate the cylinder 4 so that the positioning member 9 is against the surface or weld area of ​​the workpiece 7 to be welded, and then adjust the end position of the tungsten electrode, welding wire, welding rod, or nozzle of the welding torch 5 until the arc length is suitable for welding requirements.

[0066] During the welding process, due to the action of the cylinder 4, the positioning member 9 always maintains contact with the surface or weld area of ​​the workpiece 7 to be welded. In this way, the distance between the tungsten electrode, welding wire, welding rod or nozzle end of the welding torch 5 and the weld remains unchanged, thereby eliminating the change in the distance between the welding torch 5 and the weld of the workpiece 7 to be welded caused by the shape and assembly shape and position tolerances of the workpiece shape and assembly, the structural gap of the welding equipment itself, etc., ensuring a constant arc length and improving the welding quality.

[0067] In some embodiments, Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the floating component is an elastic member, and the elastic member is a spring 10. Springs of different structures can also be used at different positions, such as Figure 8 The spring 10 in the invention can also be used with springs of different properties, such as mechanical springs, gas springs, spring sheets, etc. Of course, the elastic member can also be a rubber column with a certain deformation capacity, or a rubber band, etc. The rubber band can be a latex rubber ring, or a latex tape.

[0068] like Figure 7 The spring 10 is sleeved on the guide shaft 12, which can be an optical axis. Stoppers 13 are provided at both ends of the guide shaft 12, one end of the spring 10 abuts against one of the stoppers 13, and the other end of the spring is connected to the connecting plate 11. Figure 8 The spring 10 shown is directly connected to the connecting plate 11 and one of the stoppers 13. The connecting plate 11 is provided with a through hole, and the connecting plate 11 is movably arranged on the guide shaft 12 through the through hole, and can slide along the axial direction of the guide shaft 12. One of the stoppers 13 can be pressed against the surface or weld area of ​​the workpiece 7 to be welded, and the other stopper 13 is connected to the connecting frame 3, and the connecting frame 3 is also connected to the welding torch 5. The connecting plate 11 can be connected to the welding head 1, and the relative position of the connecting plate 11 and the welding head 1 remains unchanged. Of course, one end of the connecting plate 11 can also be pressed against the surface or weld area of ​​the workpiece 7 to be welded, and the other end thereof can be connected to the connecting frame 3, and the connecting frame 3 is also connected to the welding torch 5. The stopper 13 is connected to the welding head 1. The principle of adjusting the arc length is similar to the principle of adjusting the floating assembly using the cylinder 4. Taking the connection of the connecting plate 11 and the welding head 1 as an example, when the spring 10 is in a compressed state, the pushing effect on the stopper 13 is maintained. When the floating assembly moves to the position where the surface of the workpiece 7 to be welded has a protrusion, the stopper 13 in contact with the surface of the workpiece 7 to be welded compresses the spring 10, and the stopper 13 at the other end will simultaneously move away from the connecting plate 11, and the connecting frame 3 will move away from the connecting plate 11 together with the stopper 13 at the other end, and the welding torch 5 connected to the connecting frame 3 will also simultaneously move away from the connecting plate 11. Instant adjustment is achieved, ensuring that the distance between the ends of the tungsten electrode, welding wire, welding rod, or nozzle and the weld is constant, that is, the arc length is constant, and solving the problems of adjustment delay and arc length change due to deviation in the traditional adjustment method.

[0069] like Fig. 9As shown, the spring 10 can also be connected to the connecting plate 11 at one end and connected to one of the stoppers 13 at the other end, and the stopper is also connected to the connecting frame 3, and the connecting frame 3 is also connected to the welding torch 5. A through hole is provided on the connecting plate 11, and the connecting plate 11 is movably arranged on the guide shaft 12 through the through hole, and can slide along the axial direction of the guide shaft 12. Another stopper 13 can be pressed against the surface or weld area of ​​the workpiece 7 to be welded. The connecting plate 11 can be connected to the welding head 1, and the relative position of the connecting plate 11 and the welding head 1 remains unchanged. Of course, one end of the connecting plate 11 can also be pressed against the surface or weld area of ​​the workpiece 7 to be welded, and the other end thereof can be connected to the connecting frame 3, and the connecting frame 3 is also connected to the welding torch 5. The stopper 13 is connected to the welding head 1. Taking the connection between the connecting plate 11 and the welding head 1 as an example, when one of the stoppers 13 is pressed against the surface or weld area of ​​the workpiece 7 to be welded, the spring 10 is in a stretched state, and the pull-back effect on the other stopper 13 is maintained. Since the two blocks are connected by the guide shaft 12, the block 13 against the surface of the workpiece 7 to be welded or the weld area always maintains a contact relationship. When the floating assembly moves to the position where the surface of the workpiece 7 to be welded has a protrusion, the block 13 in contact with it moves toward the direction close to the connecting plate 11. The block 13 at the other end moves away from the connecting plate 11, and the welding torch 5 connected to the connecting frame 3 also moves away from the connecting plate 11 at the same time. Instant adjustment is achieved, ensuring that the distance between the end of the tungsten electrode, or welding wire, or welding rod, or nozzle and the weld is constant, that is, the arc length is constant, which solves the problems of adjustment delay and arc length change due to deviation in the traditional adjustment method.

[0070] Rubber can be used as an elastic member to replace the spring 10 in the above embodiment. Different spring structures can be matched with appropriate rubber.

[0071] The floating assembly may also adopt a hydraulic cylinder or other various structures capable of achieving self-adjustment, as long as the positioning member 9 on the floating assembly can maintain contact with the surface of the workpiece 7 to be welded or the weld area.

[0072] In some embodiments, the arc length adjustment mechanism further includes a supporting plate 2 .

[0073] When the weld of the workpiece 7 to be welded is a girth weld, the floating assembly and the welding torch 5 are both arranged on one surface of the carrier plate 2, and the welding head 1 is connected to the other surface of the carrier plate 2. The welding head 1 is used to drive the carrier plate 2 to rotate, so as to drive the floating assembly and the welding torch 5 arranged on the carrier plate 2 to rotate along the circumference of the workpiece 7 to be welded, thereby enabling the welding torch 5 to perform welding.

[0074] Based on the same inventive concept, the embodiment of the utility model further provides a welding device, which includes an arc length adjustment mechanism as described in any of the above embodiments. The welding device ensures higher welding quality when performing welding operations on various welds.

[0075] A number of embodiments of the present invention have been described in detail above, but the present invention is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concept of the present invention, and these variations and modifications should all fall within the scope of protection claimed by the present invention.

Claims

1. An arc length adjustment mechanism, applied to welding equipment, the welding equipment comprising a welding torch and a welding head, the end of the welding torch is a tungsten electrode, or a welding wire, or a welding rod, or a nozzle, characterized in that: The arc length adjustment mechanism comprises: A floating assembly is connected to the welding torch, and both the floating assembly and the welding torch are connected to the welding head. The welding head is used to drive the floating assembly to move along the surface of the workpiece to be welded or the weld area. During the welding process, the floating assembly can maintain a contact relationship with the surface of the workpiece to be welded or the weld area, and the distance between the end of the welding torch and the weld remains unchanged.

2. The arc length adjustment mechanism according to claim 1, characterized in that: The arc length adjustment mechanism also includes a connecting frame; The floating assembly comprises a cylinder, a first end of a piston rod of the cylinder abuts against a surface of a workpiece to be welded or a weld area, a second end of the piston rod is connected to the connecting frame, and the connecting frame is also connected to the welding torch; The cylinder body of the cylinder is connected to the welding machine head.

3. The arc length adjustment mechanism according to claim 1, characterized in that: The arc length adjustment mechanism also includes a connecting frame; The floating assembly comprises a cylinder, a first end of a cylinder body of the cylinder abuts against a surface of a workpiece to be welded or a weld area, a second end of the cylinder body is connected to the connecting frame, and the connecting frame is also connected to the welding torch; The piston rod of the cylinder is connected to the welding machine head.

4. The arc length adjustment mechanism according to claim 2 or 3, characterized in that: The arc length adjustment mechanism further comprises a positioning member, which is arranged at the first end of the piston rod, or the positioning member is arranged at the first end of the cylinder body, and the positioning member also abuts against the surface or weld area of ​​the workpiece to be welded.

5. The arc length adjustment mechanism according to claim 4, characterized in that: The positioning member is a positioning rod, one end of which is fixedly arranged on the first end of the piston rod, or one end of which is fixedly arranged on the first end of the cylinder body, and the other end of the positioning rod is against the surface or weld area of ​​the workpiece to be welded, and the positioning rod can slide on the surface or weld area of ​​the workpiece to be welded.

6. The arc length adjustment mechanism according to claim 4, characterized in that: The positioning member includes a ball or roller and a transition auxiliary member, the ball or roller is connected to the first end of the piston rod through the transition auxiliary member, or the ball or roller is connected to the first end of the cylinder body through the transition auxiliary member, the ball or roller abuts against the surface or weld area of ​​the workpiece to be welded, and the ball or roller can roll or rotate on the surface or weld area of ​​the workpiece to be welded.

7. The arc length adjustment mechanism according to claim 1, characterized in that: The floating component is an elastic member, and the elastic member is a spring, or rubber, or a rubber band.

8. The arc length adjustment mechanism according to claim 1, characterized in that: The arc length adjustment mechanism also includes a bearing plate; When the weld of the workpiece to be welded is a circumferential weld, the floating assembly and the welding torch are both arranged on one surface of the supporting plate, and the welding head is connected to the other surface of the supporting plate. The welding head is used to drive the supporting plate to rotate, so as to drive the floating assembly and the welding torch arranged on the supporting plate to rotate circumferentially along the workpiece to be welded, thereby enabling the welding torch to perform welding.

9. A welding device, characterized in that: The invention comprises an arc length adjustment mechanism as claimed in any one of claims 1 to 8.

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