鋼材の熔接諸条件と冷却時間 (第1報) : A. 冷却曲線, 冷却速度および冷却時間について B. 被覆棒および電流の種類が冷却時間に及ぼす影響

概要

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It is the purpose of a series of reports to propose the method predicting the cooling time from 800℃ to 500℃ near fusion line, through a simple procedure from welding conditions for the various usual welding processes. In this report, first, the shape of cooling curve, the nature of cooling rate and cooling time were described. Furthermore, effects of kinds of covered electrode and electric current on the cooling time were observed. The main results are as follows : 1. The theoritical formulas for the temperature distribution and the cooling rate (R) near fusion line of base steels were summarized. 2. The cooling rate R can be expressed generally by the following formula, R=(dT)/(dS)=-k(T-T_0)^n, k : Const. The value of n is about 1.2 for the specimen used to obtain the C-C-T diagram and about 1.8 for the neighbourhood of fusion line by welding. 3. For the prediction of the microstructure and hardness in the heat-affected zone near fusion line from the C-C-T diagram, the use of cooling time from 800℃ to 500℃ is more reasonable than the use of cooling rate.
社団法人溶接学会の論文
1958-12-25