The welding method is left welding, and the welding gun moves at a constant speed, so don't jump up and down. The welding wire is added from the front of the weld pool along and near the weld seam, and the amount of addition depends on the gap and speed. Work as little as possible to avoid the formation of concave joints when flat welding and convex joints when overhead welding, and take one-step welding as the principle. The end of the welding wire is always within the argon protection range to avoid the oxidation of the red-hot end. The welding wire should not extend into the molten pool to disturb the argon flow.

The welding wire diameter is 2.0 ~ 2.5 mm, the welding current is 40 ~ 100a, the argon flow rate is 8L/min, the welding gun nozzle diameter is 8mm, and the distance between the nozzle and the workpiece is 5 ~ 10 mm. ..

Supply gas 3 ~ 5s in advance when striking the arc. Before extinguishing the arc, the traveling speed should be increased, and then the arc should be extinguished to eliminate the arc pit.

Imported pickling paste is used for post-welding cleaning. In Shenzhen Jinwei Brewery, all pickling pastes are provided by German Ziman Company. After 20 minutes, brush with stainless steel wire to remove scale, and rinse with clean water. For pipelines with low requirements, stainless steel wire brushes can also be directly used to wash while brushing. ?

Ordinary stainless steel welded pipe belongs to chemical grade, and the surface of ordinary annealed pipe looks white after pickling. Mainly used in petrochemical, sewage treatment, machinery manufacturing and other industries.

The stainless steel pipe polished inside and outside is polished, which looks bright and has good gloss. Sanitary stainless steel pipes are mainly used for conveying viscous liquids and gases, such as printing and dyeing, pulp and other industries. It should be noted here that the surface smoothness of polished stainless steel welded pipes can not fully meet the requirements of sanitary grade if industrial stainless steel pipes are directly polished inside and outside. After cold-rolled precision stainless steel pipes are polished, the surface smoothness of steel pipes can reach the national standard of sanitary stainless steel pipes.