低靭性鋼熱影響部のシャルピー吸収エネルギーに及ぼす溶接条件の影響

抄録

For brittle fractures in welding connections, it is important to pay attention to toughness decrease in weld heat affected zone (HAZ). In this paper, relationship between Charpy absorbed energy of simulated HAZs of “low toughness steel” and welded conditions were investigated. As the results, welding heat input did not affect the absorbed energy of simulated CGHAZ, but the absorbed energy became very large by decrease in maximum temperature in case of single-run welding. And heat welded conditions, by that Charpy absorbed energy became large in the CGHAZ in case of multi-layer welding, were investigated.