1. Stainless steel materials should not be in direct contact with other metals. Non-metallic materials such as wood or rubber plates should be added.
2. It is not allowed to use ordinary grinding wheel for pipe cutting, and special stainless steel grinding wheel or plasma cutting should be used.
3. The inner side of the weld seam should be filled with argon for protection during positioning welding of stainless steel pipes and fittings.
4. The arc starting, closing and arc starting adopt the re-welding method, and the arc closing should be filled with the arc crater. The arc starting must be completed in the groove. It is forbidden to arc and start the arc on the surface of the base material of the pipe and pipe fittings. If defects such as pores and cracks are found at the arc starting and ending points, they should be cleaned up in time.
5. The connection of stainless steel pipes, pipe fittings and stainless steel pipes, pipe fittings and non-stainless steel pipes, pipe fittings, welded butt joints before bottom welding, the pipe and cavity should be filled with argon protection before argon tungsten arc welding can be carried out.
6. The arc starting and ending points of multi-layer multi-layer welding should be staggered with each other.
7. When the stainless steel material is continuously welded, the temperature between the layers should not exceed 60 ℃.
8. The welding seam at the joint of the pipeline should be pickled and passivated after welding.
9. The hydraulic test of stainless steel pipe fittings has certain requirements for water temperature and water quality, and the water temperature shall not be less than 5 degrees Celsius; the chloride ion content in the water has to be greater than 25Pmm.
