Fronius CMT-A 4000 MV, Operation/Reference Manual

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Weld Process
Overview
Shielded Metal Arc Welding (SMAW)
An arc welding process that produces coalescence of metals by heating them with an arc between a covered metal electrode and the workpiece(s).
Shielding is obtained from decomposition of the electrode covering. Pressure is not used, and filler metal is obtained from the electrode.
– Stick Welding
– Performed with a basic constant current (CC) power source that is equipped with an electrode holder and a ground clamp
– Manual
Gas Tungsten Arc Welding (GTAW)
An arc welding process that produces coalescence of metals by heating them with an arc between a tungsten electrode (non-consumable) and the
workpiece(s). Shielding is obtained from a gas. Pressure may or may not be used, and filler may or may not be used.
– TIG welding
– Performed with a constant current (CC) power source equipped with a GTA welding torch that supplies current through a tungsten electrode
and ground clamp
– GTAW requires an inert gas such as Argon (most commonly used) or Helium (or a mixture of the two) to support the arc
– Manual, Mechanized, and Automated
Gas Metal Arc Welding (GWAW)
An arc welding process that produces coalescence of metals by heating them with an arc between a continuous filler metal electrode and the
workpiece(s). Shielding is obtained entirely from an externally supplied gas.
– MIG/MAG welding
– Performed with a constant voltage (CV) power supply equipped with a wire feeder to supply welding wire through a GMA welding torch to the
workpiece(s) and with a ground clamp to complete the electrical circuit
– Semi–auto process (manual), Mechanized, and Automated