ARC-LENGTH CONTROL METHOD AT STARTING OF GAS-SHIELDING ARC WELDING WITH CONSUMABLE ELECTRODE

摘要

PROBLEM TO BE SOLVED: To provide an arc-length control method at starting of gas-shielding arc welding with a consumable electrode capable of improving a transitional property of an arc-length La during an initial period Ti when the arc-length control method detects the arc-length La with a value Vw of welding voltage at occurrence of arc at a weld-starting time t3 and settles the arc-length La into a reasonable value Lc by output-controlling a welding power supply device so as to approximately equalize the value Vw of welding voltage with a predetermined voltage setup value Vr. SOLUTION: During the predetermined initial period Ti from occurrence of arc at welding start time, the arc-length La is quickly settled into the reasonable value Lc so that variable speed control at wire feeding speed Fs is performed in addition to output-control of a welding power supply device so as to approximately equalize both the value Vw of welding voltage and the voltage setup value Vr. COPYRIGHT: (C)2005,JPO&NCIPI