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The work studies the problems of increase of stability of alternating current arc in arc and plasma welding by means of improvement of welding power sources. It is noted that pulse increase of power source output voltage at arc polarity change, application of inductive-capacitive converters, using the power sources providing close to rectangular current waveform acquired the widest distribution among the well-known methods. It is shown that development of alternating current welding power sources, combining two or several methods and having in its design the circuits or devices providing the possibility to function in a mode of initial arc ignition (striking) as well as in a mode of its burning stabilizing, is the most efficient method. It can be achieved, in particular, by means of building of these circuits or devices in form of generators of high or increased voltage pulses with two independent forming circuits. Several variants of circuit solutions of the improved power sources for alternating current arc welding are given and described. 37 Ref., 7 Figures.

Improvement of welding power sources in order to increase burning stability of alternating current arc