Incorporates results of research on the effects of atmospheric exposure during welding. Recommended maximum exposure temperature has been lowered and the effects of high temperature exposure have been revised. Provides coverage on power sources, tungsten electrodes, titanium base metal grades, filler metals, joint design and preparation, pickling and cleaning, fitting and tacking, preweld cleaning, gas shielding, welding procedures and techniques, and preheat and postweld heat treatment. Also includes information on weld quality tests and safety. ANSI Approved.