APPARATUS FOR INDUCTOR CURRENT CONTROL IN ELECTRIC ARC WELDING

摘要

A D.C. arc welding current contains an inductor connected in parallel with a shunt branch containing a half-wave rectifier and a resistor. The rectifier is poled so as to block the current produced in said shunt branch by the voltage induced in the inductor on decay of the magnetic flux in the inductor. Time-delayed switching means responsive to a flow of welding current are provided for reducing the conductivity of the shunt branch from a first level to a second level (which may be zero).