When prepping stainless steel, use dedicated brushes, files and grinders that never touch carbon steel or aluminum. 

  • Photo
  • Photo
  • Photo
  • Photo
  • Photo
  • Photo

Altering established methods can help maintain quality levels and lead to significant productivity enhancements in stainless steel pipe welding applications. 

The preferred method for high purity food-grade stainless steel is an autogenous GTAW square butt weld. The ability to fuse the pipe without adding any filler metal helps keep heat down and eliminates any chemistry changes that could be created by the added filler metal.

When prepping stainless steel, use dedicated brushes, files and grinders that never touch carbon steel or aluminum. 

Precisely controlled metal transfer with modified short-circuit GMAW welding provides uniform droplet deposition and makes it easier for the welder to control the puddle and, thus, heat input and welding speeds. 

With RMD, the shielding gas comes out of the gun relatively undisturbed by the controlled transfer and gets pushed through the root opening to prevent oxidation on the backside. This feature has allowed pipe fabricators to certify processes without a backing gas in some austenitic stainless applications – completely eliminating the considerable time and cost associated with back purging larger pipes.

Controlling heat input and adhering to maximum interpass temperatures identified in welding procedures is critical to help prevent sensitization.