Electrode negative pulse welding system and method
First Claim
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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 process comprising voltage-closed loop control of the welding power during a peak phase, a transition from the voltage-closed loop control of the welding power during the peak phase to parabolic current-closed loop control of the welding power during a stabilization phase following the peak phase, and a transition from the parabolic current-closed loop control of the welding power during the stabilization phase to voltage-closed loop control of the welding power during a return phase following the stabilization phase, wherein the electrode negative pulse welding process maintains a voltage output at a desired level and allows the current output to float during voltage-closed loop control.
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Abstract
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.
156 Citations
16 Claims
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1. A welding system, comprising:
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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 process comprising voltage-closed loop control of the welding power during a peak phase, a transition from the voltage-closed loop control of the welding power during the peak phase to parabolic current-closed loop control of the welding power during a stabilization phase following the peak phase, and a transition from the parabolic current-closed loop control of the welding power during the stabilization phase to voltage-closed loop control of the welding power during a return phase following the stabilization phase, wherein the electrode negative pulse welding process maintains a voltage output at a desired level and allows the current output to float during voltage-closed loop control. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A welding system, comprising:
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a power source configured to generate welding power and deliver the welding power to a welding torch; a welding wire feeder configured to advance an electrode into the welding torch; and control circuitry configured to implement an electrode negative pulse welding process by cyclically transitioning between voltage-closed loop control and current-closed loop control, the process comprising regulating the power supply in voltage-closed loop control during a peak phase; transitioning from the voltage-closed loop control of the welding power during the peak phase to parabolic current-closed loop control of the welding power during a stabilization phase following the peak phase; and transitioning from the parabolic current-closed loop control of the welding power during the stabilization phase to voltage-closed loop control of the welding power during a return phase following the stabilization phase, wherein the process maintains a voltage output at a desired level and allows the current output to float during voltage-closed loop control. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification