When welding stainless steel pipes, the following points should be noted:

1. Clean the surface of the steel pipe: Before welding, ensure the surface of the steel pipe is clean, free of oil, dust, and oxides.

2. Select suitable welding materials: Generally, the same stainless steel material as the steel pipe should be used to ensure a stable and strong weld.

3. Control heat input: During the welding process, parameters such as voltage level, current intensity, welding rate, and electrode diameter should be carefully controlled to manage heat input.

4. Avoid over-welding: Over-welding can cause deformation of the steel pipe, generate stress, and affect weld quality. Avoid over-welding and minimize excess weld seams.

5. Use appropriate welding methods: Different welding methods have different applicable conditions. When welding stainless steel pipes, select the appropriate welding method according to actual needs, such as TIG welding, MIG welding, or manual arc welding.

6. Post-weld treatment: After welding, stainless steel pipes need to undergo subsequent treatments, such as heat treatment, annealing, and polishing, to ensure the durability of the weld.