GAS-SHIELDED AC ARC WELDING METHOD AND MACHINE MAKING USE OF CONSUMABLE ELECTRODE

摘要

It is an object of the present invention to provide a welding apparatus and a welding method capable of providing a stable arc state even in welding with a short arc length in which a short circuit frequently occurs and capable of arbitrarily setting an AC frequency and a polarity ratio with respect to all welding current values, A method of welding a consumable electrode type AC gas shielded welding method and apparatus capable of widely utilizing properties such as a high wire melting amount and the like.;In the present invention, the period of the EP polarity (T_EPOf the output voltage value V_EP), The welding current value is set to be equal to or less than the critical current value, and the period of the EN polarity (T_ENOf the output voltage value V_EN) To the output voltage value V_EP). /RTI By doing so, it is possible to make the wire melting speeds of the EN polarity and the EP polarity substantially equal, and it is possible to carry out the stable consumable electrode type AC gas shielding welding even if the arc length is short, A high wire melting rate characteristic of welding, a shallow penetration or a convex shape, and the like can be arbitrarily selected.