Stainless steel welded pipe is manufactured by rolling stainless steel plate on a machine then welding the seam. A scarfing blade then removes the weld flash from the inside and outside of the pipe. Many processes heat treat the welding zone to make the seam less visible and provides a more complete finish to the pipe.With today’s stainless steel pipe making technology, welded pipe most often has tighter dimensional tolerances than seamless pipe. Stainless steel welded pipe is manufactured by rolling stainless steel plate on a machine then welding the seam.