ステンレス鋼のTIG溶接作業性に及ぼす表面活性元素の影響

概要

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Bismuth-added stainless steels have been developed due to their good machinability with excellent chip fragmentation property, and their superior characteristics of corrosion-resistance and forging as well as the conventional SUS 304. Bismuth has been reported to act as a surface active agent which lowers the surface tension of molten metal and thus refines the solidification structure of cast ingots.The effect of bismuth on the weldability of stainless steels is not yet made clear. In this work, it has been extensively studied and the effect of bismuth and sulphur on the weldability and surface tension of stainless steel in case of TIG welding has been clarified.Bismuth acts as a surface active element as sulphur and causes Maragonian convective flow to occur within the molten pool. Due to the positive temperature coefficient, deep penetration occurs and there is a tendency for irregular bead formation.
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