Method and apparatus for short circuit welding

Details Method and apparatus for short circuit welding Method and apparatus for short circuit welding

B - Operations, Transporting

23

K

B23K 9/09 (2006.01) B23K 9/095 (2006.01) B23K 9/10 (2006.01) B23K 9/12 (2006.01) G06F 17/14 (2006.01)

Patent

CA 2455221

A method and apparatus for short circuit welding includes providing welding power suitable for short circuit welding, sensing the stick out length, and adjusting the welding speed, such as wire feed speed or travel spead, adjusting a welding parameter, or adjusting the gas mixture in response thereto. Stick out is preferably determined by measuring a welding parameter, and performing an FFT on the parameter, and then calculating stick out, in one embodiment. Stick out can be either CTTWD or CPTPD. The system can determine when a short is about to clear by calculating a value V c defined by V c = d/dt(kl*dp/dt), and comparing V c to a V threshold, which varies in response to welding cycle history.

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