アーク溶接時の冶金反応に関する研究(第 3 報) : アーク溶接時の脱酸反応
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概要
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In our previous papers, deoxidation reactions in arc melting were reported. According to those results, the following became clear : (1) Deoxidation reaction in arc melting can be treated as a reaction at some mean temperature. (2) The reaction is recognized as a first order reaction. (3) The reaction rate is proportional to the current and inversely proportional to the volume in the molten pool. In this paper, the Si and Si-Mn deoxidation reactions in arc welding were studied on the basis of the previous results. Weldings, using a mother plate (with or without an oxidizing surface) which contained Si, Mn and a wire in which oxygen was contained, were performed under certain pressures of Argon. This prevents the absorption of oxygen from the atmosphere into the molten pool. From those experiments, the relation between the oxygen content and the welding condition as well as the content of Si, Mn was investigated and analysed using the reaction equation proposed. This equation was obtained under the assumption that the pool was in a state of complete mixing and also by the application of the rate equation reported in our previous paper, as follows : [numerical formula] where [%0] is oxygen content in pool; [%0]_i is initial oxygen content; [%0]_e is apparent equilibrium oxygen content in pool; I is current; S is nugget area; f is welding speed; k_o is rate constant. The experimental results show that the oxygen content does not change perceptibly, even though the welding speed or the current may change where the initial oxygen content and the content of Si, Mn are constant. On the other hand, the values of I/Sf are almost constant within the limits of this experiment. Therefore, it is understood that the above results are mainly caused by the right side of the equation being constant. Furthermore, the relation between the value of k_0 calculated by the equation and the contents of Si, Mn, shows the same tendency as teh one related to arc melting. Therefore, the equation proposed does not contradict the previous result in arc melting. From the above, quantitative treatment of deoxidation reactions in arc welding may be possible by applying this equation.
- 社団法人溶接学会の論文
- 1969-09-25
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