Welding technology for stainless steel composite tubes

Abstract

The invention discloses a welding technology for stainless steel composite tubes, which comprises the following steps: (1) conducting welding on the stainless steel composite tube overlying layer to form a welding path I; (2) welding a transition layer between the stainless steel composite tube overlying layer and the substrate layer to form a welding path II; (3) conducting welding on the stainless steel composite tube substrate layer to form a welding path III. According to the welding technology for stainless steel composite tubes provided by the invention, the overlying layer stainless steel (inner layer) of the composite tube is welded first and the substrate carbon steel (outer layer) is welded later, so as to effectively solve the problem that the conventional technology, namely welding carbon steel first and welding stainless steel later, can not weld a composite tube with a diameter smaller than 325, and the welding of the transition layer (welding path II) between the overlying layer and the substrate layer better solves the problem that, in the process of welding overlying layer, the increase of overlying carbon leads to the decrease of overlying layer corrosion, and the problem that, in the process of welding substrate layer, the increase of alloy (chromium and nickel) content leads to the forming of hard organization in the welding line is solved as well.

Description

technical field [0001] The invention relates to the field of composite material welding technology of two or more different metals, and relates to a stainless steel composite pipe welding technology. Background technique [0002] At present, the welding of composite materials of two or more different metals is a relatively complicated welding process problem. The composite material of stainless steel and carbon steel is used as an example to illustrate (hereinafter referred to as composite material). [0003] The current existing composite material welding process is to weld carbon steel first and then stainless steel, but this process cannot be realized in some cases, such as the welding of inner stainless steel and outer carbon steel steel pipes, which is a headache, and this patented technology It can be well applied to this field and solve this problem. [0004] For steel pipes with inner stainless steel and outer carbon steel, the stainless steel is located in the inne...

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Problems solved by technology

[0005] In view of the above problems, the present invention researches and designs a stainless steel composite pipe welding process, which is used to solve the shortcomings that the existing welding process can not be realized by traditionally welding carbon steel first and then stainless steel for steel pipes with inner stainless steel and outer carbon steel.

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