Welding steel often creates heat discoloration and welding burns. Prior to finishing many parts with processes such as powder coating, painting, clear coats or simple final assembly, the removal of the discoloration and preparation of the surface is necessary.
Elements were welded onto this steel tube prior to powder coating. In addition to the discoloration (blue streak seen on the left side), this part started to rust in storage. The powder coating process specified that the part be clean and smooth.