Gas Metal Arc Welding (GMAW )

GMAW is an arc welding process that uses an arc between continuous filler metal electrode and the weld pool. The process is used with shielding from an externally supplied gas and without the application of pressure.

GMAW may be operated in semiautomatic, machine, or automatic modes. It employs a constant voltage (CV) power supply, and uses either the short circuiting, globular, or spray methods to transfer metal from the electrode to the work.

Advantages:

  • The only consumable electrode process that can used with commercial metals and alloys
  • Weld deposition rates are much higher than hashtag#SMAW
  • Minimal cleaning (no slag)

Limitations:

  • Welding is costly and complex more so than hashtag#SMAW
  • Sensitive to air drafts and loss of shielding
  • GMAW-S is subject to lack of fusion
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