大電流MAG溶接の溶滴移行現象に及ぼす溶接ワイヤ組成の影響

概要

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The effects of chemical composition of the welding wire on the metal transfer of droplet, the welding arc phenomena and the melting rate of the welding wire were investigated in high current MAG welding process with Ar-He-CO2-O2 shielding gas.The results obtained are summarized as follows;(1) The metal transfer of droplet from wire tip to the molten pool and the welding bead configuration showed the extreme differences depending on the chemical compositions of the welding wire and the molten pool.(2) Such differences in the metal transfer and the weld bead configuration seemed to have the relationships with the surface tension (γ) and the temperature coefficient (dγ/dT) decided by the chemical compositions of the welding wire and the molten metal.(3) The melting rates of the welding wires were increased with the electrical resistivity of them. The longer the welding extension, the larger the different electrical resistivity.
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