Overall welding method of stainless steel pipeline

Abstract

The invention relates to the technical field of stainless steel welding, and disclosed an overall welding method of a stainless steel pipeline. The overall welding method includes the steps that firstly, pollution layers on welding openings of the stainless steel pipeline are removed, and the start end of the stainless pipeline is closed through a sealing cover; secondly, spot welding is conducted on the whole stainless steel pipeline, and the welding openings are sealed through masking paper; thirdly, a stainless steel test weld short pipe is arranged at the tail end of the stainless steel pipeline in a spot welding mode, the spot welding portion is sealed through masking paper, the other end of the stainless steel test weld short pipe is sealed through transparent adhesive tape, and a small hole is formed in the sealing portion; fourthly, a nitrogen pipeline penetrates through a sealing ring at the start end of the stainless steel pipeline and is inflated with nitrogen for 30 minutes, and test weld is conducted in the joint of the stainless steel test weld short pipe and the stainless steel pipeline; fifthly, the color of a weld joint is observed through the sealing portion of the stainless steel test weld short pipe until the weld joint turns from black to blue; sixthly, the inflation amount of nitrogen is maintained, and welding points of the whole stainless steel pipeline are welded. By the application of the overall welding method, welding work quality and efficiency are improved.

Description

technical field [0001] The invention relates to the technical field of stainless steel welding, in particular to an integral welding method for stainless steel pipelines. Background technique [0002] Stainless steel pipes are required to be used in PCW, CDA and other systems in the clean rooms of semiconductor and TFT plants, and when welding stainless steel pipes, the inner weld seam of stainless steel pipes is strictly prohibited from blackening and bluish oxidation, which is harmful to the stainless steel pipes. Welding makes high demands. The current conventional practice is to inject nitrogen or argon as shielding gas before welding stainless steel pipes, and inflate shielding gas while welding. However, it is difficult to control the concentration of shielding gas in stainless steel pipes, which may easily lead to the failure of stainless steel pipe welding. To meet the quality requirements, resulting in material waste, extended construction period and other issues. ...

AI Technical Summary

Problems solved by technology

The current conventional practice is to inject nitrogen or argon as shielding gas before welding stainless steel pipes, and inflate shielding gas while welding. However, it is difficult to control the concentration of shielding gas in stainless steel pipes, which may easily lead to the failure of stainless steel pipe welding. Meet the quality requirements, resulting in waste of materials, prolonging the construction period and other issues

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