JPS57199565A - Short circuit transfer arc welding machine - Google Patents

Abstract

PURPOSE:To form weld beads of superior penetration in the stage of welding by a short circuit transfer arc welding machine by forming the current waveform in an arc period to a pulse form thereby increasing the quantity of penetration into base materials. CONSTITUTION:A DC power source 1, a current detector 11, a voltage detector 15 and a electricity conduction controller 30 for welding current consisting of a switching element 2, a switch command circuit 12 and three judgers 16, 17, 20 are provided to a short circuit transfer welding device. Electricity is conducted to the DC power source circuit 1 to short circuit the leading end of a wire electrode 7a to base materials 10, then the electrode 7a is melt cut and an arc is generated. In accordance with the operations of the three judgers by the detected voltage of the detector 15 and the detected current value of the detector 11, the circuit 12 emits a command to the element 2 which in turn controls the current waveform of the arc period to a pulse form, and causes melting of the electrode 7a and the base material 10 by heating, thereby increasing penetration to the base materials and forming superior weld beads.