Two stage welder and method of operating same
AssigneeLincoln Global, Inc.
InventorChristopher Hsu
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Abstract
An electric arc GMAW welder is provided, which welder includes a high speed switching power supply with a controller for creating a first or second weld process across the gap between a workpiece and a welding wire advanced toward the workpiece. The first process uses a first current waveform and the second process uses a second current waveform. A circuit is provided for shifting between the first and second weld processes. The shifting circuit includes a counter for counting the waveforms in the first and second processes and a circuit to shift from the process being processed to the other weld process when the waveform count of the weld process being processed reaches a preselected number for such weld process.
Claims5
An electric arc welder including a high speed switching power supply with a controller for creating a pulse wave weld process using a first current waveform comprising a first series of pulses and a weld process to clear a short using a second current waveform comprising a second series of pulses, a circuit activated to create a short signal when the arc voltage is below a value indicative of a short and a switch to shift said controller from said pulse wave process to said short clearing process by a process shift signal created upon creation of said short signal, wherein said short clearing process is a surface tension transfer weld generating process.
Dependencies are inferred from the claim text.