To execute stabilized and efficient welding by setting the time, at which pulse welding voltage is turned to smaller than threshold level voltage, to arc short circuiting width and adjusting welding condition corresponding to a size of width and/or arc short circuiting generating frequency.
Welding state of a welding power source 9 to weld a base metal 1 is measured and controlled by a controller 10. When base voltage is lowered than a threshold level 30, a comparator 12 discriminates that arc short circuiting is happened so as to generate a comparator output 31. The output 31 is counted by a counter 15 through a gate circuit 14, an interruption signal generating circuit 16 generates an interruption signal 22 corresponding to generation of the output 31, so as to be made to arc short circuiting frequency, A computer 11, on receiving the interruption signal 32, detects generation position of arc short circuiting and changes a mode of range, center, height, etc., of weaving and arc voltage. As a result, happening of arc short circuiting is reduced, welding efficiency is improved.
MAKI YUUICHI
MIZUKAMI SEIJI
MIBU IKUO
MAEDA KENICHI
HITACHI ENG SERVICE
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