Welding device

Abstract

The invention 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 beneficial to improving the uniformity and the performance of a welding layer.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to a welding device suitable for a welding process combining fuse welding and powder welding. Background Art

[0002] Surfacing is an important processing method in surface engineering, mainly used to prepare wear-resistant, corrosion-resistant and high-temperature resistant strengthening layers on the substrate surface. The main types of raw materials used in surfacing include wire and powder, but both materials have their own disadvantages. Limited by the wire processing method, the alloy content of the wire used for surfacing has an upper limit; and when loose powder is used for surfacing, the thickness of a single layer of surfacing is small. Therefore, when a thicker surfacing layer needs to be processed, multiple surfacings are required, and the surfacing efficiency is low.

[0003] The method of using a fuse to build up the surface of the substrate and spreading powder on the welding surface of the substrate, and using the heat of the arc to melt the powder, has gradually been recognized and widely used by the industry. This method has the advantages of increasing the thickness of the build-up layer, alloy composition, and reducing the heat input and dilution rate of the substrate. However, the pre-laid powder generally falls on the surface of the substrate in a free-falling manner. Due to the lack of external constraints, the laid welding material powder is in the shape of a "hill". In order to ensure that there is 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 edge of the "hill" is easily unable to melt and form a build-up layer because it is far away from the central area, resulting in low powder utilization, and increasing the workload of collecting powder. At the same time, the probability of powder being contaminated during the collection process will also increase. In addition, the shape of the "hill" makes the powder thickness uneven, resulting in poor arc stability and affecting the uniformity of the shape and performance of the welding layer. In this case, the advantages of the build-up method combining powder laying and fuse cannot be fully utilized.

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

[0005] The main technical problem solved by the present invention is to provide a welding device which is beneficial to improving the uniformity of the appearance and performance of the welding layer.

[0006] In order to solve the above technical problems, the present invention provides a welding device, including a welding gun head and a walking arm, the welding device also includes a powder fence, the powder fence is arranged around the welding gun head, the powder fence 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.

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

[0008] Figure 1 Schematic diagram of the exploded structure of a welding device according to an embodiment of the present invention.

[0009] Figure 2 Schematic diagram of the assembly structure of a welding device according to an embodiment of the present invention.

[0010] Figure 3 It is a schematic structural diagram of a powder fence in another embodiment of the present invention.

[0011] Figure 4 It is a cross-sectional schematic diagram of a powder fence along line AA in another embodiment of the present invention. DETAILED DESCRIPTION

[0012] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

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

[0014] The powder fence 10 is woven from a plurality of metal wires. In a specific embodiment of the present invention, the powder fence 10 includes 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-shaped 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 hangs downward. The fence component 12 is arranged around the welding gun head 20, so that the fence component 12 defines an internal space in which the welding gun head 20 can reciprocate. The fence component 12 on each side is formed by a multi-layer arrangement of metal wires, including at least three layers of metal wires. Each layer includes a plurality of metal wires, and the plurality of metal wires are parallelly spread out with the side as the surface to form a "wall". The diameter of the metal wire is 80μm-300μm. The spacing distance between the metal wires is 30μm-80μm.

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

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

[0017] A holding portion 31 and a rigid connector 32 are provided at one end of the traveling arm 30. A slot 310 is provided on the holding portion 31. In the embodiment of the present invention, the powder fence 10 and the welding gun head 20 are installed on the traveling arm 30. Specifically, the slider 220 of the welding gun head 20 can be slidably installed in the slot 310 of the holding portion 31. The supporting frame 11 of the powder fence 10 is fixedly connected to the traveling arm 30 through the rigid connector 32. The welding nozzle part of the welding gun head 20 can reciprocate in the internal space defined by the powder fence 10.

[0018] During operation of the welding device 100 of the embodiment of the present invention, the traveling arm 30 is driven by the traveling drive mechanism, and the welding gun head 20 and the powder fence 10 move together with the traveling arm 30. The welding gun head 20 can also reciprocate relative to the powder fence 10 in the powder fence 10. When powder materials such as alloy powder and flux are added to the surface of the workpiece to be welded, they can be constrained by the powder fence 10 to form a rectangular shape; during welding, the arc can also be constrained in the powder fence 10, which improves the distribution of the welding arc and powder, improves the arc stability and the uniformity of the welding layer performance, and is conducive to further reducing the dilution rate and heat input on the surface of the workpiece to be welded.

[0019] It is understandable that, considering that the surface of the workpiece to be welded is often not a smooth plane, when the powder fence 10 moves with the walking support arm 30 on the workpiece surface, obstruction and friction will occur. Therefore, the powder fence 10 is made of metal wire and has a certain flexibility to ensure the smooth movement of the powder fence 10. In order to reduce the shaking that may occur when the powder fence 10 encounters a rough surface or the surface of the workpiece has ups and downs during movement, the metal wire of the powder fence 10 can deviate from the plumb line at a certain angle, that is, the angle between the metal wire and its horizontal movement direction on the surface of the workpiece to be welded is less than 90°; preferably, the angle is greater than 75° and less than 84°. Because the surface of the workpiece to be welded is in a high temperature state during the welding operation, and the powder fence 10 will also rub against the surface of the workpiece to produce wear, the metal wire of the powder fence 10 needs to have good high temperature resistance and wear resistance. In addition, the powder added during the welding operation generally contains some ferromagnetic materials. If the powder fence 10 generates a certain degree of magnetism after friction during the operation, it will absorb the powder and affect the alloy composition of the weld or the weld layer. Therefore, considering certain requirements for high temperature resistance and wear resistance and to avoid the powder fence 10 absorbing powder, the metal wire is preferably made of non-magnetic stainless steel material.

[0020] Please refer to Figure 3 and Figure 4One or more feeding channels 13 and powder recovery channels 14 may also be provided on the support frame 11 of the powder fence 10. With reference to the welding direction during welding, the feeding channel 13 is provided in front of the welding gun head 20, and the powder recovery channel 14 is provided behind the welding gun head 20. The feeding channel 13 and the powder recovery channel 14 extend into the internal space defined by the fence component 12. The powder recovery channel 14 is connected to the negative pressure device, and the negative pressure generated by the negative pressure device is used to recover the excess powder after welding is completed, thereby reducing the loss of powder.

[0021] It can be understood that the support frame 11 can also extend to the outside of the internal space defined by the fence part 12, and the powder recovery channel 14 is arranged on the part of the support frame 11 extending to the outside of the fence part 12, that is, the powder recovery channel 14 can also be arranged on the outside of the internal space enclosed by the powder fence 10, so as to avoid premature recovery of powder when the powder recovery channel 14 is too close to the welding gun head 20 during welding operation.

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

[0023] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A welding device, comprising a welding gun head and a traveling arm, characterized 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 support arm and move integrally with the walking support arm.

2. The welding device according to claim 1, characterized in that: The powder fence is woven from multiple metal wires.

3. The welding device according to claim 2, characterized in that: The metal wire is made of non-magnetic stainless steel.

4. The welding device according to claim 2, characterized in that: The powder fence comprises a supporting frame and a fence component. The fence component is a comb-tooth structure composed of a plurality of metal wires. One end of each metal wire is fixed on the frame edge of the supporting frame, and the other end hangs downward.

5. The welding device according to claim 4, characterized in that: The fence component on each side is 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 spread out in parallel with the side as the surface.

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

7. The welding device according to claim 2, characterized in that: The powder fence comprises a supporting frame and a fence component, and the fence component comprises a mesh structure woven from a plurality of metal wires.

8. The welding device according to claim 2, characterized in that: The diameter of the metal wire is 80 μm-300 μm, and the spacing between the metal wires is 30 μm-80 μm.

9. The welding device according to claim 1, characterized in that: 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 groove is provided on the clamping part; the slider of the welding gun head can be slidably installed in the clamping groove of the clamping part.

10. The welding device according to claim 2, characterized in that: 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 according to claim 10, characterized in that: The angle is greater than 75° and less than 84°.

12. The welding device according to claim 4, characterized in that: One or more feeding channels are also arranged on the supporting frame of the powder fence, and the feeding channels extend into the inner space surrounded by the powder fence.

13. The welding device according to claim 12, characterized in that: 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 according to claim 13, characterized in that: The powder recovery channel extends into the inner space surrounded by the powder fence.

15. The welding device according to claim 13, characterized in that: The powder recovery channel is arranged outside the inner space surrounded by the powder fence.

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