The first completely new treatment of (GTAW) since 1980, this comprehensive document (AWS C5.5) is an indispensable tool for operators, supervisors, trainers, and other GTAW professionals. The standard presents recommended practices for the GTAW process. It provides a fundamental explanation of the process, describes basic practices and concepts, and outlines advanced methods and applications. These features should help welding personnel determine the best applications of GTAW, and apply it in manual and automated operations. This edition addresses the present uses of GTAW in the metal fabricating industry, new applications, and advances in research and development. It provides many practical recommendations on the use of GTAW, and a handy troubleshooting section.