ELECTRICAL ARC WELDING APPARATUS USING A WELDING SEQUENCE OF INTERVALS OF HIGH AND LOW MEAN POWER

摘要

An apparatus for spray-arc welding includes a controllable current source, feed rollers for feeding a wire-like consumable electrode of additive material to the weld location; and a control unit for automatically adjusting the current source in dependence upon the weld sequence. The control unit includes a regulator for dividing the welding sequence in a controlled manner into intervals of high and low mean power, by intermittently increasing and decreasing the output of the welding current source in relation to the average output corresponding to the set rate of feed of said wire-like electrode and to the selected length of the arc; and a switching element for preventing the commencement of a high-power interval before the momentary output voltage has fallen to a given value.