This document is designed to assist anyone who is associated with gas tungsten arc welding (GTAW). This includes welders, welding technicians, welding engineers, quality control personnel, welding supervisors, purchasing personnel, educators, and students. This document discusses welding principles, equipment, gas shielding , and techniques for manual and automatic GTAW. Welding safety, trouble shooting, and related items are included for understanding by all types of personnel in establishing better production welding operations