MIB-300A and MIB-600A AC Inverter Welding Power Supplies


Offering increased control, the MIB-300A and MIB-600A AC Inverter Welding Power Supplies result in more exact heat input and better-quality welds as compared to traditional AC weld controls. The AC inverter uses inverter technology with pulse width modulation to produce and simulate an AC waveform. Unlike AC welders that use line frequency and depend on well-regulated facility power, the AC inverter can produce an AC frequency from 50 to 500 Hz, is not affected by line voltage fluctuation, and provides a balanced three phase load.


The MIB-300A and MIB-600A feature secondary constant current control, up to 20 pulses per weld, and the ability to set upslope, downslope, and weld interrupt. Up and downslope improve energy input into the welded material; interrupt stops the flow of current if displacement breaches a set level, preventing over welding.


MIB-300A and MIB-600A may be used with the same transformers and weld heads as standard AC welders. With max output currents of 20,000 and 40,000 A respectively, the units may be used for a variety of different welding applications. Common uses for AC inverters include sheet metal welding, wire compacting, and brazing.


  • More effective control of heat input than standard AC welding power supplies
  • Reduced Peltier effect during weld and reduced magnetization of work piece and magnetic materials around electrodes
  • Secondary constant current control
  • Increased maximum number of pulsations: up to 20 times each for WELD 1, 2, 3
  • Set interrupt, upslope, and downslope for all waveforms (Weld 1, 2, 3) – Interrupt function helps prevent over welding of workpiece; upslope and downslope improve energy input into workpiece
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