火花突合熔接中の温度分布と最適熔接條件の決定(第 2 報)

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In the second report, a mathematical analysis of temperature distribution during flash welding is presented to discuss satisfactorily the establishment and the form of the stabilized temperature distribution, and to introduce mathematically the fundamental non-dimensional parameters which are essential in correlating the temperature data in various metals and alloys. Linear, parabolic as well as the general flashing patterns are discussed. The fundamental parameters are : ⩛=(T-T_o)/(T_m-T_o), and η=(na/k^n)^<1/(2n-1)>ξ, where T is the temperature, T_o the initial temperature, T_m the melting point of the material being flashed, and ξ is the distance from the instantaneous flashing interface, k the thermal diffusivity, n and a are constants to determine the displacement of moving platen with a relation X_p=at^n, t being the time from the start of flashing. In parabolic flashing, η=(g_p/k^2)^<1/3>ξ where g_p is the platen acceleration. The effect of cooling by the clamping jaws is the more pronounced when a parameter : η_1=(g_p/k^2)^<1/3>(l_o-B_c+vD) is the smaller, where l_o is one half the initial clamping distance, D the diameter or thickness of speciamen, v=1/2 for round and v=1 for rectangular sections, and B_c the critical burn-off per specimen. The critical burn-off is estimated with : B_c=(g_p/k^2)^<-1/3>. It has also been shown that the effect of heat of transformation in steels is negligible, and a reasonable and theoretical determination of the average value of thermal diffusivity over the temperature range from room temperature to melting point, has been proposed.
社団法人溶接学会の論文
1955-07-10

火花突合熔接中の温度分布と最適熔接條件の決定(第 2 報)

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