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A method and structure for welding bushings on flat tubes

A bushing and flat tube technology, which is applied in the field of welding bushings on flat tubes, can solve problems such as uncontrollable position, asymmetrical solder joints, and inability to penetrate electrodes, and achieve the effect of ensuring accuracy

Active Publication Date: 2021-10-26
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 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 is mainly composed of a flat tube and a steel wire bushing. The section length of the flat tube is 78mm, the height is 10mm, and the wall thickness of the flat tube is 1.0mm. The steel wire bushing is surrounded by spot welding to the flat tube. The number of solder joints on the upper and lower surfaces is 28 and 40 respectively

Method used

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  • A method and structure for welding bushings on flat tubes
  • A method and structure for welding bushings on flat tubes
  • A method and structure for welding bushings on flat tubes

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Experimental program
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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 tube, comprising: 1. Inserting a skid into the flat tube; 2. Fitting and welding the middle section of the U-shaped bushing to one surface of the flat tube; 3. 1. Bend the two cantilevers of the bushing to fit the other side of the flat tube. 4. Place a high-conductivity metal sheet on the outside of the bushing on the welded surface, and connect the metal sheet to the flat tube with a metal wire ; Five, the unwelded surface of the welded flat tube. With this method, the surface of the conduit can be controlled to ensure that the conduit is not deformed during the welding process; the distribution position of the solder joints can be freely selected to ensure the accuracy of the number and position of the solder joints.

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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Patent Type & Authority Patents(China)
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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