Welding Aluminum: Theory and Practice (Fifth Edition, 2022) is the Association's reference textbook on welding aluminum, prepared by a task group of aluminum welding and joining experts. The fifth edition has been revised and expanded and covers the metallurgy of aluminum as it affects welding, alloy and filler metal selection, joint design, gas tungsten arc and gas metal arc welding, plasma arc welding, resistance and stud welding, brazing and soldering, weld defects and their causes, inspection and testing, and the qualification of procedures and personnel, with practical guidance on preparation, cleaning, fixturing, distortion control and safety. It is used by welding engineers, fabricators, inspectors and training programmes.