Method and structure for welding bushing on flat pipe

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...

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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

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