瞬時発現の線熱源ならびに移動点熱源による厚い母板の温度上昇の冷却速度

概要

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Temperature cooling rate is calculated for points near bead line in thick plate when linear heat source is applied instantaneously along all the range of bead whose length is l. Fig. 4 shows CR (cooling rate passing a definite temperature T_s) along the bead, and we see that CR at bead end is 2 times the bead center of infinite length. For the point whose distance from the bead end is 2 times γ_m, CR is 0.56 times the bead end. Here γ_m means the perpendicular distance from the bead, where the maximum temperature is equal to T_s, and γ_m is shown in equ. (29). Equ. (4) gives the relation of CR and temperature T_s, input heat q_0. Fig. 7 shows the effect of bead length, and we see that for l>2γ_m, CR for the bead end is practically equal to that for l=∞, and for l<1.5γ_m, CR is equal to that of the point heat whose heat is equal to q_0・l. For a moving point heat source, cooling rate is also calculated for starting and stopping ends of bead and those values are compared with that of infinite velocity. From Fig. 8 we see the ratio tends to unity for X>10.
1976-10-05