CN110814496A

CN110814496A - Method and structure for welding bush on flat pipe

Info

Publication number: CN110814496A
Application number: CN201911130230.9A
Authority: CN
Inventors: 武国栋; 申静芳; 方志忠; 王林; 丁清国; 陈昊; 邱树彬; 刘兴红; 郑忠俊; 李立新
Original assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Current assignee: AECC Guizhou Liyang Aviation Power Co Ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-02-21
Anticipated expiration: 2039-11-18
Also published as: CN110814496B

Abstract

The invention discloses a method for welding a bush on a flat pipe, which comprises the following steps: firstly, filling a skid in the flat pipe; secondly, the middle section of the U-shaped bush is attached to and welded with one surface of the flat pipe; bending two cantilevers of the bushing to be attached to the other surface of the flat pipe, padding a high-conductivity metal sheet outside the welded surface of the bushing, and connecting the metal sheet and the flat pipe by using a metal wire; and fifthly, welding the non-welded surface of the flat pipe. By adopting the method, the profile of the conduit can be controlled, and the conduit is ensured not to deform in the welding process; the distribution positions of welding points can be freely selected, and the accuracy of the number and the positions of the welding points is ensured.

Description

Method and structure for welding bush on flat pipe

Technical Field

The invention relates to the field of resistance electric welding, in particular to a method and a structure for welding a bush on a flat tube.

Background

When resistance spot welding processes a flat pipe, need to weld a steel wire bush on the flat pipe through resistance spot welding's mode, because the structural reason (flat pipe internal diameter) of flat pipe, it is intraductal to lead to the electrode can't go deep into, if upper and lower electrode is in flat pipe two outer walls departments about, can lead to the part to warp under electrode pressure, and because two sides solder joint is asymmetric, if apply the electrode simultaneously in A, B two sides, then can leave irregularly at two sides steel wire bush, and the uncontrollable solder joint in position, can't satisfy the welding requirement, the part structure is shown in fig. 1-4, the part mainly has 1 flat pipe and a steel wire bush to constitute, flat pipe cross-section is long for 78mm, high-order 10mm, flat pipe wall thickness is 1.0mm, the steel wire bush surrounds to flat pipe through spot welding mode on, the surface figure is 28 respectively about the flat pipe, 40.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problems, the invention designs a set of welding spot welding method, which can effectively control the deformation of the pipe caused by the pressure of the electrode, can freely select the distribution position of welding spots and ensure the accuracy of the quantity and the position of the welding spots.

The technical scheme of the invention is as follows:

a method of welding a bushing to a flat tube, comprising: firstly, filling a skid in the flat pipe; secondly, the middle section of the U-shaped bush is attached to and welded with one surface of the flat pipe; bending two cantilevers of the bushing to be attached to the other surface of the flat pipe, padding a high-conductivity metal sheet outside the welded surface of the bushing, and connecting the metal sheet and the flat pipe by using a metal wire; and fifthly, welding the non-welded surface of the flat pipe.

In the second step, electrodes are respectively arranged on the bushing side and the flat tube side for resistance spot welding.

In step four, the electrodes are located on the sheet metal side and the unwelded bent side of the bushing, respectively.

The metal sheet and the metal wire have a conductivity greater than a conductivity of the bushing.

The utility model provides a structure of welding bush on flat pipe, includes flat pipe and bush, and the bush is the U-shaped, and the middle section of bush and flat pipe openly spot welding are in the same place, and two electrodes are located the both sides of flat pipe respectively, have filled up the metal sheet between bush middle section and electrode, and the metal sheet passes through metal wire and flat union coupling.

The metal plate is a copper plate, and the metal wire is a copper wire.

And filling a wood pad into the flat pipe.

The bushing is a steel wire bushing.

The invention has the beneficial effects that:

1) by adopting the method, the profile of the conduit can be controlled, and the conduit is ensured not to deform in the welding process;

2) by adopting the method, the distribution positions of the welding spots can be freely selected, and the accuracy of the quantity and the positions of the welding spots is ensured.

Drawings

Fig. 1 is a schematic view of a flat tube structure.

Fig. 2 is a view from the direction B of fig. one.

Fig. 3 is a view from direction C of fig. one.

Fig. 4 is a schematic cross-sectional view.

FIG. 5 is a schematic structural view of the A-side of the spot weld of the present invention.

FIG. 6 is a schematic structural view of the B-side of the spot welding of the present invention.

FIG. 7 is a schematic cross-sectional view of the B-face of the spot weld of the present invention.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

the specific implementation mode is as follows:

1. shape correction: the flat pipe 1 is made of 1Cr18Ni9Ti, belongs to austenitic stainless steel, has good plasticity and toughness, and is straightened by cold straightening so as to smoothly plug the skid 3 into the cavity in the following process;

2. and (3) plugging a skid: the skid 3 is plugged into the cavity, so that the skid 3 is tightly attached to the inner wall of the flat pipe 1, the pressure of the electrode 4 can be borne by the skid 3, and the flat pipe 1 cannot deform in the welding process.

3. Welding the surface A: attaching the middle section of the U-shaped steel wire bush 2 to the outer wall of the flat tube 1 according to the size requirement, and welding the steel wire bush 2 and the surface A of the flat tube 1 according to the graph shown in FIG. 5;

4. pad copper sheet 5 and copper wire 6: a copper sheet 5 is additionally arranged between the A-surface electrode 4 and the steel wire bush 2, and the copper sheet 5 is communicated with the flat tube 1 through a copper wire 6, so that most of electricity is transmitted to the guide tube 1 through the copper sheet 5 and the copper wire 6, as shown in FIGS. 6 and 7; other metal materials are also possible as long as the electrical conductivity is higher than that of the wire bushing 2.

5. Welding the surface B: bending the two cantilevers of the steel wire bush 2, attaching the cantilevers on the outer wall of the flat tube 1 according to the size requirement, and welding the steel wire bush 2 and the B surface of the flat tube 1 according to the drawings of 6 and 7;

6. taking out the skid 3: pulling the skid 3 out of the cavity;

7. shape correction after welding: and (3) performing cold correction on the flat pipe 1 to ensure the profile dimension R150 of the flat pipe, as shown in figure 1.

Claims

1. A method of welding a bushing to a flat tube, comprising: firstly, filling a skid in the flat pipe; secondly, the middle section of the U-shaped bush is attached to and welded with one surface of the flat pipe; bending two cantilevers of the bushing to be attached to the other surface of the flat pipe, padding a high-conductivity metal sheet outside the welded surface of the bushing, and connecting the metal sheet and the flat pipe by using a metal wire; and fifthly, welding the non-welded surface of the flat pipe.

2. A method of welding a bush on a flat tube according to claim 1, wherein: in the second step, electrodes are respectively arranged on the bushing side and the flat tube side for resistance spot welding.

3. A method of welding a bush on a flat tube according to claim 1, wherein: in step four, the electrodes are located on the sheet metal side and the unwelded bent side of the bushing, respectively.

4. A method of welding a bush on a flat tube according to claim 1, wherein: the metal sheet and the metal wire have a conductivity greater than a conductivity of the bushing.

5. The utility model provides a structure of welding bush on flat pipe, includes flat pipe and bush, its characterized in that: the bush is U-shaped, and the middle section of bush and flat tub of front spot welding are in the same place, and two electrodes are located the both sides of flat tub respectively, have filled up the metal sheet between bush middle section and electrode, and the metal sheet passes through metal wire and flat tub of connection.

6. The structure for welding the bush on the flat tube according to claim 5, wherein: the metal plate is a copper plate, and the metal wire is a copper wire.

7. The structure for welding the bush on the flat tube according to claim 5, wherein: and filling a wood pad into the flat pipe.

8. The structure for welding the bush on the flat tube according to claim 5, wherein: the bushing is a steel wire bushing.