Repair welding method of stainless steel pipe:

1. Use welding data corresponding to the chemical composition of parent material;

2. Low current and fast welding are adopted to reduce heat and thermal deformation. During manual arc welding, short arc shall be used as much as possible to avoid the destruction of stable chemical elements such as Ti;

3. The stress relief annealing shall be stopped after the stainless steel pipe is welded, or the mechanical method of shot peening and hammering or explosive treatment can be adopted to reduce the tensile stress of the weldment or keep the surface in the state of compressive stress;

4. In order to avoid intergranular corrosion, the solid solution shall be stopped again after welding.

Stainless steel is the abbreviation of stainless and acid resistant steel. Steel resistant to weak corrosive media such as air, steam and water or stainless steel is called stainless steel; The steel resistant to chemical corrosion medium is called acid resistant steel. Due to the difference in chemical composition, their corrosion resistance is different. Ordinary stainless steel is generally not resistant to chemical medium corrosion, while acid resistant steel is generally stainless.