Abstract
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 and high toughness.
Although mild steel is generally adopted for welded structures, it needs an exceedingly large gauge to give sufficient strength and involves difficulties in building up welded structures. In this report on research, an examination was conducted on the effects of the intensity of restraint, restraint stress, and the thraot raito Qw upon delayed cracks during manual arc welding on high-strength steel.
