低合金鋼の溶接割れに及ぼす予・後熱の効果に関する研究(第2報) : 化学組成及び組織から見た予・後熱条件(昭和59年度春季全国大会論文発表講演論文)

概要

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The Application of supplementary heat to a weld joint before or after welding have been studied using a mild steel, medium carbon steels, 50 to 100 kg/mm^2 high tensile steels, low alloy steels, martensitic stainless steels and cast steels. The results indicate that (1) When preheating is applied for preventing cold cracking in heat-affected zone, a new carbon equivalent, i.e. Pre. Ceq.=C+0.06Mn+0.03Ni+0.06Cr+0.10Mo, is useful in predicting the cracking susceptibility of a wide variety of steels above-mentioned, (2) the critical preheat and interpass temperatures are reduced by using postheating, (3) these temperatures must be held till postheating at the temperatures above the critical point (T_<2C>) at which hydrogen-induced cracking can not occur, (4) the T_<2C> depends on the chemistry of steel, and the T_<2C> values may be given by T_<2C>(℃)=455 Post Ceq. -110,Post Ceq.=C-0.08Si+0.20Mn+0.03Ni+0.05Cr+0.12Mo+0.84V, and (5) it is desirable for avoiding hot cracking that the preheat and interpass temperatures are lower than Ms point.
社団法人溶接学会の論文
1984-02-05