Method and structure for welding bushing on flat pipe

A bushing and flat tube technology, applied in the field of welding bushings on flat tubes, can solve problems such as uncontrollable position, inability to meet welding requirements, and asymmetry of solder joints, and achieve the effect of ensuring accuracy

Active Publication Date: 2020-02-21
CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When processing a flat tube by resistance spot welding, a steel wire bushing needs to be welded to the flat tube by resistance spot welding. Due to the structure of the flat tube (the inner diameter of the flat tube is small), the electrode cannot go deep into the tube. If The upper and lower electrodes are located on the upper and lower outer walls of the flat tube, and the parts will be deformed under the pressure of the electrodes, and due to the asymmetry of the solder joints on both sides, if electrodes are applied on both sides A and B at the same

Method used

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  • Method and structure for welding bushing on flat pipe
  • Method and structure for welding bushing on flat pipe
  • Method and structure for welding bushing on flat pipe

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] The specific implementation is as follows:

[0025] 1. Shaping: The material of the flat tube 1 is 1Cr18Ni9Ti, which is austenitic stainless steel and has good plasticity and toughness. Cold straightening is used to straighten the bent flat tube so that the skid 3 can be smoothly inserted into the cavity later;

[0026] 2. Plug the skid: Insert the skid 3 into the cavity to ensure that the skid 3 is closely attached to the inner wall of the flat tube 1, to ensure that the skid 3 can bear the pressure of the electrode 4, and to ensure that the flat tube 1 will not be deformed during the welding process.

[0027] 3. Welding side A: Attach the middle section of the U-shaped steel wire bushing 2 to the outer wall of the flat tube 1 according to the size requirements. Figure 5 As shown, the steel wire bushing 2 and the A side of the flat tube 1 are welded;

[0028] 4. Add copper sheet 5 and copper wire 6: add copper sheet 5 between the electrode 4 on the A surface and the ...

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Abstract

The invention discloses a method for welding a bushing on a flat pipe. The method comprises the following steps: firstly, inserting a cushion wood into the flat pipe; secondly, bonding and welding themiddle section of the U-shaped bushing and one surface of the flat pipe; thirdly, bending two cantilever arms of the bushing to be attached to the other surface of the flat pipe; fourthly, padding ametal sheet with high conductivity outside the welded surface of the bushing, and connecting the metal sheet with the flat pipe by using a metal wire; and fifthly, welding the unwelded surface of theflat pipe. By adopting the method, the profile of the guide pipe can be controlled, and it is ensured that the guide pipe is not deformed in the welding process; and the distribution positions of welding spots can be freely selected, and the quantity and the position accuracy of the welding spots are guaranteed.

Description

technical field [0001] The invention relates to the field of electric resistance welding, in particular to a method and structure for welding a bush on a flat tube. Background technique [0002] When processing a flat tube by resistance spot welding, a steel wire bushing needs to be welded to the flat tube by resistance spot welding. Due to the structure of the flat tube (the inner diameter of the flat tube is small), the electrode cannot go deep into the tube. If The upper and lower electrodes are located on the upper and lower outer walls of the flat tube, and the parts will be deformed under the pressure of the electrodes, and due to the asymmetry of the solder joints on both sides, if electrodes are applied on both sides A and B at the same time, irregularities will be left on the steel wire bushings on both sides, and Solder joints with uncontrollable positions cannot meet the welding requirements, and the structure of parts such as Figure 1-Figure 4 As shown, the part...

Claims

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Application Information

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IPC IPC(8): B23K11/11B23K11/36
CPCB23K11/11B23K11/36
Inventor 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
Owner CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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