ELECTRODE NEGATIVE PULSE WELDING SYSTEM AND METHOD

摘要

A welding system includes a power source configured to generate power and deliver the power to a welding torch. The power is provided in accordance with an electrode negative pulse welding regime that includes a cyclic peak, followed by a stabilization phase, then a return to a background level. The stabilization phase has a generally parabolic current shape, and is performed in a current-closed loop manner until a transition point, where control becomes voltage-closed loop until the background level is reached. Resulting weld performance is improved, with a globular-like transfer mode, reduced shorts and enhanced arc stability.

主权项

1. A welding system, comprising:
a power source configured to generate welding power and deliver the welding power to a welding torch, wherein the welding torch is coupled to a negative output terminal of the power source; a welding wire feeder configured to advance a metal cored electrode into the welding torch at a rate of advancement; and control circuitry configured to implement an electrode negative pulse welding regime comprising a voltage-closed loop peak phase, a generally parabolic current-closed loop stabilization phase following the peak phase, and a voltage-closed loop return phase following the stabilization phase.