溶接熱影響部の結晶粒粗大化に関する研究(第8報)
結晶粒成長式の溶接条件選定への応用
1977 年 46 巻 10 号 p. 713-720
詳細
1977 年 46 巻 10 号 p. 713-720
In this report, it was confirmed that the results obtained in previous report could be applied to the selection of welding conditions in order to improve the toughness in weld-heat affected zone (HAZ) of hieh tensile steels.
Main results obtained are as follows.
(1) Toughness of high tensile steels with various microstructures can be improved by refinement of prior austenite grain.
(2) Austenite grain size in HAZ of electron beam welding can be calculated using Eq. (1) derived in previous report.
(3) In electron beam welding of 100 kg/mm2 grade high tensile steel, it was calrified that toughness' in HAZ could be improved considerably if heat input per penetration depth was controlled under 2.6 KJ/cm2, using Eq. (1).
