B - Operations – Transporting – 23 – K
Patent
B - Operations, Transporting
23
K
327/67
B23K 9/06 (2006.01) B23K 9/10 (2006.01)
Patent
CA 1045686
ABSTRACT OF THE DISCLOSURE A constant potential single phase A. C. power welding source is connected to a thyristor network and an energy storing inductor to create a square wave welding current that is adjustable in height, and is further adjustable to allow either half-cycle to be wider than the other, the sum of two adjacent half-cycles always equaling 360°. The welding current is forced to reverse rapidly by a substantial voltage to insure conduction when the welding load is an arc to an aluminum work piece, and the aluminum tends- to rectify. The heights of the positive and negative half-cycles are simul- taneously adjustable in response to manual control and feedback signals. In addition, the ratio of the heights of the positive and negative half-cycles can be other than 1:1 by selectively enabling a conduction path through a different number of turns on the inductor during the negative and positive half-cycles, such enabling being either continuous or on an adaptive feedback basis as a function of arc length as determined by arc voltage. The height difference is effective in a step fashion since the total ampere-turns must remain constant. The thyristor network may also be re-connected for full-wave rectification for D.C. welding.
251698
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