チタンのパルスMIG (Metal Inert Gas) 溶接におけるアーク安定性と溶滴移行に及ぼすワイヤ表層酸素およびカルシウムの影響

概要

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The influence of oxygen and calcium in the surface layer of titanium welding wire on arc stability and droplet transfer in pulsed metal inert gas (MIG) welding was investigated. Outbreak phenomenon of the arc was classified into two types, a concentrated arc and a sprayed arc. In both types, cathode spots were generated stable position on base metal by the effect of oxygen in welding wire surface. With regard to droplet transfer, droplets were formed and transferred into molten pool stably in case of the concentrated arc, whereas droplets were not formed often or their travel times into molten pool were enlarged in case of the sprayed arc. The results of the investigation are concluded that the calcium in the surface layer of welding wire makes the arc stable and the oxygen in it assists the droplet transfer.