Surface Treatment of Stainless Steel Welded Pipes

During the manufacturing process, stainless steel welded pipes can develop rust spots and welding spatter on their surfaces. Additionally, scratches can occur on the surface during use. How should these issues be addressed? What are the proper methods for handling these problems?

Rust Spots:

Rust on stainless steel welded pipes, whether occurring before or during the manufacturing process, indicates severe surface contamination. It is crucial to remove any rust before the equipment is put into use. The thoroughly cleaned surface should be inspected using an iron test and/or water test to ensure all rust has been eliminated.

Welding Spatter:

Welding spatter is significantly influenced by the welding technique used. Tungsten Inert Gas (TIG) welding does not produce spatter. However, Gas Metal Arc Welding (GMAW) and Flux-Cored Arc Welding (FCAW) can result in substantial spatter if welding parameters are not correctly set. To minimize spatter, it is essential to adjust the welding parameters properly.

To address welding spatter effectively, apply an anti-spatter agent to both sides of the joint before welding. This reduces the adhesion of spatter, making it easier to remove after welding without damaging the surface or causing minimal harm.

Scratches:

To prevent the accumulation of process lubricants, byproducts, and contaminants, it is necessary to mechanically clean scratches and other rough surfaces. The manufacturing process of stainless steel welded pipes must be meticulously managed. Avoiding minor issues where possible ensures the quality of the final product.

By following these guidelines, the surface treatment of stainless steel welded pipes can be managed effectively, ensuring high-quality products free from rust, spatter, and scratches.