高張力鋼の初層溶接部のルート割れに及ぼす開先形状の影響

抄録

With the demand for the increasingly large capacity of machines and equipment, structural dimensions are growing large, and design stress is becoming higher eventually. This naturally necessitates the use of high-strength steel possessing high tensile strength and high toughness.
Although mild steel is generally adopted for welded structures, it needs an exceedingly large gauge to give sufficient strength and involves difficulites in builiding up welded structures. In this report an examination was conducted on the effects of intensity of restraint, restraint stress, and the groove shape influencing delayed cracks during manual are welding on high-strength steel.