How is arc start typically initiated in GMAW?

• A. Contacting the wire to the workpiece for a short circuit
• B. Striking the arc by tapping the torch on the weld bead bevel
• C. Starting the arc without any contact
• D. Using a wire spool preheated to start

Answer: (A)

Arc start in GMAW is typically initiated by bringing the electrode tip into contact with the workpiece to create a brief short circuit, then lifting slightly to re-establish the arc. This short-arc start uses the constant-current/voltage power supply and the continuous wire feed to ignite the arc reliably, with shielding gas flowing to protect the weld from the moment of ignition. It’s simple, repeatable, and works across a wide range of materials and thicknesses. While other starts (like non-contact high-frequency initiation) exist on some machines, the touch-to-workpiece method is the standard, practical way to start the arc in GMAW.