Korotynskyy O. Arc welding high-efficiency power sources based inductance-capacitance transducers.

The thesis is dedicated to research, development and commercial production of new welding high-efficiency power sources, as well as mobile welding-technological systems. Comprehensive theoretical and experimental studies were conducted into the resonance processes occurring in welding inductance-capacitance transducers (WICT) at different degrees of circuit detuning. It was found that the required value of detuning should be selected depending on the welding method (MMA, TIG, MIG/MAG) to provide the best stability of the arc, as well as other welding-technological properties (weld formation, spattering, defects formation, etc.). It is shown that the most suitable method for increasing power of WICT is transition to the modular principle of design of these transducers. Procedures for coherent analysis of interaction of welding currents of the connected modules were developed, and methods for control of power in arc welding were suggested for this purpose. New double-loop circuits ofresonance-mode powersources were suggested, characterized by an improved stability of the welding arc, and allowing the welding process to be successfully realized at the alternating current using basic electrodes. The work performed resulted in commercial production of 15 new power sources and five welding-technological systems, based on inductance-capacitance transducers.