This edition reflects vital updates to code requirements and welding inspector qualifications in previous editions. This code is the single most important reference available on welding requirements for any type of aluminum alloy structure except aluminum pressure vessels and fluidcarrying pipelines. Includes a commentary offering guidance for interpreting and applying the code. ANSI Approved. Safety and health issues and concerns are beyond the scope of this standard and therefore are not fully addressed herein. This code is not intended for specialized fabrication such as pressure vessels or pressure piping.