薄鋼板における溶接欠陥と溶接品質評価 : 薄鋼板のフラッシュ溶接現象とプロセス制御に関する研究(第一報)

概要

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Influence of chemical elements of base material has been investigated on interface quality of flash weld. Bend test of welds was carried out for 43 kinds of sheet steels which included solid solution strengthened, dual phase and precipitation hardened high strength steels up to 590 MPa. Fractography anlysis indicated that cracks at weld interface were caused by oxide inclusions. Aluminum, silicon and manganese were major elements of the inclusion, and whose influence were determined to be strong as 10 : 1 : 0.01 in the order. Carbon was also proved to affect cracking at interface by reducing ductility of weld. Equivalent formula was experimentally established for the influence of those elements on interface cracking. The ordinary bend test was proved to be used as a simple and reliable method in quantitative evaluation of the interface quality of flash weld, while notch bend test showed higher ability in the evaluation than that.
1995-08-05