Abstract
This chapter focuses on the arc initiation in the gas tungsten arc welding (GTAW) process, uses of low-frequency (1–10 Hz) modulation of the current in the GTAW process, uses of high-frequency (above 5000 Hz) pulsed GTAW, square wave AC, etc. The GTAW process is well established as a high-quality fusion welding technique. Developments in the process have extended the potential application range and offer improved process control. A useful feature of the GTAW process is the ability to control weld pool temperature and size by means of independent cold-wire addition. This is used in manual welding operations to control the weld profile and penetration, particularly in positional work. Mechanized wire addition by means of a separate hand-held wire dispenser or a torch-mounted feed system is available for manual operation, but, although these can increase the operating efficiency of the process, they tend to be restricted to simple weld geometry and joints with good access.
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