Resistance welding process of fluid reservoir of compressor

Abstract

The invention discloses a resistance welding process of a fluid reservoir of a compressor. The resistance welding process of the fluid reservoir of the compressor is used for projection welding synchronous rings of an upper case body of the fluid reservoir, a steel tube and a copper tube and connecting a lower case body of the fluid reservoir in a seal welding. The resistance welding process comprises the following steps that: S1, welding end of the steel tube is cold pressed in the shape of a horn; S2, welding end of the copper tube is cold pressed in the shape of a convex ring and inserted into the horn-shaped welding end of the steel tube; S3, the copper tube contacts with the end face of the horn-shaped welding end of the steel tube before welding and a gap is formed between the copper tube and the inner side of the horn-shaped welding end of the steel tube, a line contact is formed between the steel tube and the fluid reservoir of the compressor to suspend the steel tube inside the upper case body of the fluid reservoir; S4, pressure is exerted on working parts by medium-frequency direct-current resistance ring projection welding to discharge and fusion weld the copper tube and the steel tube and the steel tube and the upper case body, and to seal weld the upper case body and the lower case body by resistance seam welding. The resistance welding process is capable of welding the fluid reservoir, downsizing working space, saving technological process and solder, reducing cost and meeting structural requirements of the fluid reservoir with the steel tube inside and the copper tube outside.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding method between tube shell members of different materials. Background technique [0002] In the past, when it was necessary to weld the upper shell of the steel liquid storage tank and the butt joint steel pipe and copper pipe three components at the same time, brazing in the furnace was usually used for welding. This process requires a tunnel heating furnace, requires a large work site, and also needs to add solder , the welding cost is high, and the welding process has high energy consumption, low efficiency and pollutes the environment. [0003] The Chinese invention patent with the application number of 200810029403 discloses a resistance welding method, which is a process for welding two workpieces, a copper pipe with a diameter of 7.8 mm and a steel shell, and a slightly larger copper pipe with a diameter of more than 9 mm cannot be used. This process method is used for weldin...

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Problems solved by technology

[0002] In the past, when it was necessary to weld the upper shell of the steel liquid storage tank and the butt joint steel pipe and copper pipe three components at the same time, brazing in the furnace was usually used for welding. This process requires a tunnel heating furnace, requires a large work site, and also needs to add solder , the welding cost is high, and the welding process has high energy consumption, low efficiency, and pollutes the environment

[0003] The Chinese invention patent with the application number of 200810029403 discloses a resistance welding method, which is a process for welding two workpieces, a copper pipe with a diameter of 7.8 mm and a steel shell, and a slightly larger copper pipe with a diameter of more than 9 mm cannot be used. The process method for welding

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