METHOD OF CONTROLLING OUTPUT OF WELDING POWER SOURCE

摘要

PURPOSE:To prevent occurrence of short circuit in high current period by making a decresing rate or increasing rate of current caused by increase or decrease of voltage between a consumable electrode and base metal in high current period more than 10A/V. CONSTITUTION:Output of welding power source is controlled by repeating a period TSS in which prescribed short circuit current is impressed at the time of short circuit, a high current period TAP in which prescribed high current is impressed from just after generation of an arc and a low current period TAB in which prescribed low current is impressed following the high current period TAP. At this time, the decreasing rate or increasing rate of current caused by increase or decrease of voltage between the consumable electrode and base metal during the high current period TAP is made more than 10A/V.