This book is a compilation of technical manuscripts on production of HF welded pipe and tube. It covers mill tooling, welding operations, weld defects, heat treatement of weld seam, and flying shear cutting of pipe and tube. The manuscripts, including those written by the editor, were all compiled and edited together to form a cohesive technical document by Robert K. Nichols, PE while employed at Thermatool. There is a new edition available which is identical to the old edition except the cover color has changed and the editors name has been removed. Nothing else has been changed.