熔接が鋼材の遷移温度に及ぼす影響について(第 4 報)

概要

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A longitudinal bead was laid on the surface of kahn tear test piece to investigate the effect of manual arc welding on the notch sensitivity of structural mild steel plates. The saw cut was located perpendicular to the deposited bead to evaluate the notch sensitivity of welds when a crack, originated in the heat-affected zone, propagates toward the base material. Welded plates generally showed higher transition temperatures than unwelded plates, ranging from 5 to 14℃ in 13mm thick plates and 1 to 11℃ in 23mm thick ones. These adverse effects of welding were almost the same when the crack propagated along the heat-affected zone. Accordingly, it is reasonable to conclude that the fracture transition temperature is nearly determined by the starting condition of brittle failsure with a rapid velocity of propagatian.
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