Generation of Controlled Current Pulses for Welding Applications

摘要

This report describes the engineering considerations of work performed to improve circuit welding machines. A truck-battery powered welding machine design which uses saturated transistors as switches for currents in the 1000 ampere range is analyzed mathematically and investigated experimentally. Also described is another welder which uses unsaturated transistors to switch and regulate the weld current. A third welder design investigated uses silicon-controlled rectifiers as switches in the secondary of a welding transformer. A waveform generator which can accurately modulate the weld current, and a circuit which enables five welders to operate from one set of batteries are also discussed. (Author)