| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of an arc break caused by a magnetic arc blow in consumable-electrode pulse arc welding. SOLUTION: In the consumable-electrode pulse arc welding where the energization of a peak current Ip and a base current Ib are alternately repeated, the arc break caused by the magnetic arc blow is suppressed in a short time in the following way. When an arc is generated during an energization period Tb of the base current and the rising rate Dv of a welding voltage Vw becomes a predetermined reference rising rate Dvt or more with no short circuit being generated just before the voltage Vw becomes so, a judgement (t25) that the magnetic arc blow occurs is made to rapidly increase the base current to 200 A or more. Next, when the welding voltage Vw is decreased during the period of the magnetic arc blow, a judgement (t26) that the magnetic arc blow is ceased is made to return the base current Ib+Iu to the normal value Ib. COPYRIGHT: (C)2004,JPO&NCIPI
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