低合金鋼の溶接割れにおよぼす予・後熱の効果に関する研究(第 1 報) : 冷間割れを防止するための予・後熱における基礎的諸問題

概要

論文の詳細を見る
Some basic problems in the application of supplementary heat to a weld joint before or after welding have been investigated using a mild steel, medium carbon steels, 50 to 100kg/(mm)^2 high tensile steels and low alloy steels. The results indicate that (1) cold cracking can not occur at temperatures above the critical point, which is 80℃ in the case of HT-80 steel joint, (2) the activation energy determined by the incubation time is 11000cal/mol at temperatures over-30℃ and 2300cal/mol below -30℃, (3) the activation energy determined by the effect of post-heating on cracking is 13000cal/mol independently of steel grade, and (4) the preheat temperature may be reduced by using post-heating, but thermal stress cracking may occur under certain conditions under which blue brittleness or precipitation brittleness takes place.
社団法人溶接学会の論文
1974-07-05