In welded tube production at PTC Alliance, high frequency electric resistance welding is the heart of the process, and superior weld integrity is a matter of course. Production begins with the forming of flat rolled carbon, alloy, or HSLA steel into a tubular shape, with the edges pressed together. As the tube hollow is passed through the weld head, electric current is applied to the abutting surfaces. At near-molten temperature, the edges are squeezed together, creating a homogeneous steel tube. Because no filler material is required, uniform chemistry is assured throughout. Inside and outside welding flash is removed during the process and all material is 100% ultrasonically tested in the weld zone.