B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
B23K 9/095 (2006.01) B23K 9/09 (2006.01) B23K 9/10 (2006.01) G06F 19/00 (2006.01)
Patent
CA 2443884
Electric arc welder (10) performs a given weld process with selected current waveform performed between electrode (24) and workpiece (26). Welder (10) includes a controller with a digital processor (30), sensor (44) for reading instantaneous weld current, and circuit (56) to convert the instantaneous current into a digital representation of the level of instantaneous weld current. Digital processor (30) has program circuit (64, 66) to periodically read and square the digital representation at a given rate, register (70, 72) for summing a number N of square digital representations to give a summed value, and an algorithm (82, 84, 86, 88) for periodically dividing the summed value by the number N to provide a quotient and then taking the square root of said quotient to thereby digitally construct rms signal (40) representing the root mean square of the weld current.
Hasan Robert
Houston William S.
Myers Russell K.
O'donnell Timothy M.
Gowling Lafleur Henderson Llp
Lincoln Global Inc.
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