Welding device

Abstract

The utility model discloses a welding device which comprises a welding gun head and a walking support arm, the welding device further comprises a powder fence, the powder fence is arranged around the welding gun head, and an internal space is defined by the powder fence and used for the welding gun head to do reciprocating motion in the internal space. The welding gun head and the powder fence are installed on the walking supporting arm and integrally move along with the walking supporting arm. The welding device is favorable for improving the uniformity and the performance of a welding layer.

Description

TECHNICAL FIELD

[0001] The utility model relates to welding equipment technical field, especially a kind of welding device suitable for the welding process of combination of fuse welding and powder laying welding. BACKGROUND

[0002] Surfacing is an important processing method in surface engineering, mainly used to prepare wear-resistant, corrosion-resistant and high-temperature-resistant strengthening layer on the surface of the substrate. The main raw materials used in surfacing include wire and powder, but these two materials have their own disadvantages. Due to the limitation of wire processing method, the alloy content of wire used for surfacing has an upper limit; when using loose powder for surfacing, the thickness of single-layer surfacing is small, so when processing a thicker surfacing layer, multiple surfacing is required, and the surfacing efficiency is low.

[0003] The method of using fuse to surfacing the surface of the substrate and laying powder on the substrate welding surface at the same time, using arc heat to melt the powder, is gradually recognized and widely used by the industry. This method has the advantages of increasing the thickness of the surfacing layer, alloy composition, reducing the heat input and dilution rate of the substrate. However, the pre-laid powder is generally in free-fall mode on the surface of the substrate. Since there is no external constraint, the laid welding powder is in the shape of a "hill". In order to have a certain thickness of powder in the arc melting area, the diameter of the "hill" needs to be increased. At this time, the powder at the outermost part of the "hill" is easy to be unable to melt to form a surfacing layer due to its distance from the central area, resulting in low utilization rate of powder and increasing the workload of collecting powder. At the same time, the probability of powder being contaminated during the collection process is also increased. In addition, the shape of the "hill" makes the thickness of the powder uneven, causing poor arc stability and affecting the uniformity of the appearance and performance of the weld layer. In this way, the advantages of the surfacing method combining powder laying and fuse cannot be fully realized.

[0004] Therefore, it is necessary to provide a welding device suitable for the surfacing process combining powder laying and fuse, to improve the problem of arc stability caused by uneven powder thickness and improve the uniformity of the appearance and performance of the weld layer. SUMMARY

[0005] The technical problem solved by the utility model is to provide a welding device that can improve the uniformity of the appearance and performance of the weld layer.

[0006] To solve the above technical problems, the utility model provides a welding device, which comprises a welding gun head and a walking support arm. The welding device further comprises a powder fence, which is arranged around the welding gun head and encloses an internal space for the welding gun head to move reciprocally. The welding gun head and the powder fence are installed on the walking support arm and move integrally with the walking support arm.

[0007] The welding device of the embodiment of the present application can limit the powder and the electric arc within a reasonable range by the setting of the powder fence, and is beneficial to improve the stability of the welding electric arc and the uniformity of the welding layer performance. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 The figure is a disassembled structure schematic view of the welding device of the embodiment of the present application.

[0009] Figure 2 The figure is an assembled structure schematic view of the welding device of the embodiment of the present application.

[0010] Figure 3 The figure is a structure schematic view of the powder fence in another embodiment of the present application.

[0011] Figure 4 The figure is a cross section schematic view of the powder fence along A-A line in another embodiment of the present application. DETAILED DESCRIPTION

[0012] The preferred embodiment of the present application is described in detail below with reference to the accompanying drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly defined.

[0013] Please refer to Figure 1 and Figure 2 The welding device 100 of the embodiment of the present application comprises a powder fence 10, a welding gun head 20 and a walking support arm 30.

[0014] The powder fence 10 is woven by a plurality of metal wires. In the embodiment of the present application, the powder fence 10 comprises a support frame 11 and a fence component 12. The support frame 11 is a square frame structure. The fence component 12 is a comb-tooth structure composed of a plurality of metal wires. One end of each metal wire is fixed to the frame edge of the support frame 11, and the other end is downwardly suspended. The fence component 12 is arranged around the welding gun head 20, so that the fence component 12 defines an internal space for the welding gun head 20 to reciprocate therein. The fence component 12 on each side is formed by a plurality of layers of metal wires, including at least three layers of metal wires. Each layer includes a plurality of metal wires, which are parallelly expanded with the side as a plane to form a plane "wall". The diameter of the metal wire is 80-300 μm. The spacing distance between the metal wires is 30-80 μm.

[0015] It can be understood that the fence component 12 of the powder fence 10 can also be a mesh structure woven by metal wires.

[0016] The welding nozzle 21 of the welding torch head 20 extends into the internal space defined by the fence component 12, and the other end opposite to the welding nozzle 21 is provided with a holding structure 22, and the side of the holding structure 22 is provided with a laterally protruding sliding block 220.

[0017] One end of the walking support arm 30 is provided with a clamping part 31 and a rigid connecting body 32. The clamping part 31 is provided with a clamping groove 310. In the embodiment of the utility model, the powder fence 10 and the welding torch head 20 are installed on the walking support arm 30. Specifically, the sliding block 220 of the welding torch head 20 is slidably installed in the clamping groove 310 of the clamping part 31. The support frame 11 of the powder fence 10 is fixedly connected with the walking support arm 30 through the rigid connecting body 32. The welding nozzle part of the welding torch head 20 can reciprocate in the internal space defined by the powder fence 10.

[0018] In the operation of the welding device 100 in the embodiment of the utility model, the walking support arm 30 is driven by the walking driving mechanism, and the welding torch head 20 and the powder fence 10 move together with the walking support arm 30, and the welding torch head 20 can also reciprocate relative to the powder fence 10 in the powder fence 10. When the alloy powder, flux and other powders are added to the surface of the workpiece to be welded, they can be constrained by the powder fence 10 to become approximately rectangular body shape; during welding, the electric arc can also be constrained in the powder fence 10, thus improving the distribution of the welding arc and the powder, improving the stability of the electric arc and the uniformity of the performance of the welding layer, and at the same time, it is also beneficial to further reduce the dilution rate and heat input of the surface of the workpiece to be welded.

[0019] It can be understood that considering that the surface of the workpiece to be welded is not a smooth plane many times, when the powder fence 10 moves on the surface of the workpiece with the walking support arm 30, blocking and friction will occur, therefore, the powder fence 10 is made of metal wire and has a certain flexibility, which can ensure smooth movement of the powder fence 10. In order to reduce the shaking of the powder fence 10 when it encounters rough surface or the surface of the workpiece has ups and downs during movement, the metal wire of the powder fence 10 can be deviated from the plumb line by a certain angle, that is, the included angle between the metal wire and the horizontal movement direction of the surface of the workpiece to be welded is less than 90°; preferably, the included angle is greater than 75° and less than 84°. Since the surface of the workpiece to be welded is in a high temperature state during welding operation, and the powder fence 10 also rubs against the surface of the workpiece to generate wear, therefore, the metal wire of the powder fence 10 needs to have good high temperature resistance and wear resistance. In addition, the powder added during welding operation generally contains some ferromagnetic materials, if the powder fence 10 has certain magnetism after rubbing during operation, it will adsorb the powder, affecting the alloy composition of the weld or welding layer; therefore, in order to meet the requirements of certain high temperature resistance and wear resistance and to avoid the powder fence 10 from adsorbing the powder, the metal wire is preferably non-magnetic stainless steel material.

[0020] Please refer to Figure 3 andFigure 4 One or more powder feeding passages 13 and powder recycling passages 14 can also be provided on the support frame 11 of the powder fence 10. With the welding direction as the reference, the powder feeding passages 13 are arranged in front of the welding torch head 20, and the powder recycling passages 14 are arranged behind the welding torch head 20. The powder feeding passages 13 and the powder recycling passages 14 extend into the interior space defined by the fence component 12. The powder recycling passages 14 are connected to a negative pressure device, and the negative pressure generated by the negative pressure device is used to recycle the excess powder after the welding is completed, thereby reducing the consumption of the powder.

[0021] It can be understood that the support frame 11 can also extend to the outside of the interior space defined by the fence component 12, and the powder recycling passages 14 are arranged on the part of the support frame 11 extending to the outside of the fence component 12, that is, the powder recycling passages 14 can also be arranged on the outside of the interior space enclosed by the powder fence 10, so that the powder can be recycled too early when the powder recycling passages 14 are too close to the welding torch head 20 during the welding operation.

[0022] The welding device 100 can improve the stability of the welding arc and the uniformity of the welding layer performance, and can further reduce the dilution rate and heat input of the substrate.

[0023] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection range of the present application.

Claims

1. A welding apparatus comprising a welding torch head and a travelling boom, characterised in that: The welding device also includes a powder fence, which is arranged around the welding gun head and encloses an internal space for the welding gun head to reciprocate therein; the welding gun head and the powder fence are installed on the walking arm and move integrally with the walking arm.

2. The welding device of claim 1, wherein: The powder fence is made of multiple metal wires.

3. The welding device of claim 2, wherein: The metal wire is made of non-magnetic stainless steel.

4. The welding device of claim 2, wherein: The powder fence includes a support frame and a fence component. The fence component is a comb-shaped structure composed of multiple metal wires. One end of each metal wire is fixed to the frame edge of the support frame, and the other end hangs downward.

5. The welding device of claim 4, wherein: The fence components on each side are formed of multiple layers of metal wires, including at least three layers of metal wires; each layer includes multiple metal wires, and the multiple metal wires are extended in parallel with the side as the surface.

6. The welding device of claim 4, wherein: The supporting frame of the powder fence is fixedly connected to the walking support arm through a rigid connector.

7. The welding device of claim 2, wherein: The powder fence includes a supporting frame and a fence component, and the fence component includes a mesh structure woven from multiple metal wires.

8. The welding device of claim 2, wherein: The diameter of the metal wire is 80 μm-300 μm, and the distance between the metal wires is 30 μm-80 μm.

9. The welding device of claim 1, wherein: The welding nozzle of the welding gun head extends into the internal space surrounded by the powder fence, and a holding structure is provided at the other end opposite to the welding nozzle, and a laterally protruding slider is provided on the side of the holding structure; a clamping part is provided at one end of the walking support arm, and a clamping slot is provided on the clamping part; the slider of the welding gun head can be slidably installed in the clamping slot of the clamping part.

10. The welding device of claim 2, wherein: The angle between the metal wire of the powder fence and its horizontal movement direction on the surface of the workpiece to be welded is acute.

11. The welding device of claim 10, wherein: The angle is greater than 75° and less than 84°.

12. The welding device of claim 4, wherein: The supporting frame of the powder fence is further provided with one or more feeding channels, which extend into the inner space enclosed by the powder fence.

13. The welding device of claim 12, wherein: A powder recovery channel is also provided on the support frame of the powder fence; the feeding channel is provided in front of the welding gun head, and the powder recovery channel is provided behind the welding gun head.

14. The welding device of claim 13, wherein: The powder recovery channel extends into the inner space surrounded by the powder fence.

15. The welding device of claim 13, wherein: The powder recovery channel is arranged outside the inner space surrounded by the powder fence.

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