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Pro-test effective: how to deal with the black surface of 304 stainless steel pipe?
Pro-test effective: how to deal with the black surface of 304 stainless steel pipe?
If the 304 stainless steel pipe is welded, the inner and outer surfaces of the 304 stainless steel pipe are black and yellow. This is caused by insufficient welding gas purity or high temperature oxidation on the back. Use the following three methods to avoid such things.
1. Increase the purity of argon used in welding 304 stainless steel pipe to pure argon. From the outer surface of 304 stainless steel pipe, pure argon is significantly brighter than ordinary argon welding.
2. The backside should be protected by argon gas. The important 304 stainless steel pipe should be backside protected after welding. Otherwise, high temperature oxidation will cause the welding layer passing through the backside to oxidize and produce defects. Polishing the backside weld is the same as slag. After protection, it can effectively prevent back oxidation.
3. You can apply a back protection agent on the back side, which is a kind of protection that can save argon. Just apply a thickness of about 1 mm, and then when the front side is soldered, a thin film is formed on the back side to form a protective layer.
   If you have found that the weld marks of 304 stainless steel pipe are black, you can use pickling passivation paste to clean it, which is to use acid to corrode the black oxide layer on the surface, and then rinse it with clean water.
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