METHOD AND SYSTEM TO INCREASE HEAT INPUT TO A WELD DURING A SHORT-CIRCUIT ARC WELDING PROCESS

摘要

A method and a system to control heat input to a weld during an arc welding process. A series of electric arc pulses are generated between an advancing welding electrode and a metal workpiece using an electric arc welding system capable of generating an electric welding waveform to produce the electric arc pulses while manipulating the feed speed and/or direction of the electrode. A cycle of the electric arc welding waveform includes a pinch current phase providing an increasing pinch current level, a peak current phase providing a peak current level, a tail-out current level, and a background current phase providing a background current level. At least one heat-increasing current pulse of the cycle is generated, providing a heat-increasing current level, during the background current phase, where the heat-increasing current level is above the background current level. The cycle of the electric welding waveform with the at least one heat-increasing current pulse may be repeated until the arc welding process is completed.

主权项

1. A method of welding, said method comprising:
generating an output current waveform and providing said output current waveform to an electrode, where said output current waveform has a plurality of peak current pulse portions and a plurality of background current portions, where each of said plurality of said peak portions are separated by one of said background current portions; generating a plurality of current pulses during each of said background current portions in between said peak current pulse portions, wherein said plurality of current pulses during said background current portions have a current level which is intermediate to a first current level for said background currents portions and a current level for each of said peak current portions, and wherein a current level for each of said plurality of current pulses in any one background current portion is the same; and manipulating at least one of a feed speed and a feed direction of said electrode while performing said providing of said output current waveform to said electrode.