Chapter 1 from the Welding Handbook, Ninth Edition, Volume 2, “Welding Processes, Part 1,” has been selected by the AWS Product Development Committee as a service to industry professionals. This chapter presents a general overview of the electrical power sources used for arc welding. It explores the many types of welding power sources available to meet the electrical requirements of the various arc welding processes. Topics covered in this chapter include the following: 1. The volt-ampere (V-A) characteristics required for common welding processes, 2. Basic electrical technologies and terminology used in power sources, 3. Simplified explanations of commonly used power source circuits, and 4. An introduction to useful national and international standards.
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