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通过试验测定了高灯杆浸镀锌液的表面换热系数 ,分析了焊缝区温度场的分布 ,采用三维有限元模型定量研究了热浸镀时浸入起始端、浸入角度、速度、深度和换热系数波动等工艺条件对灯杆座焊缝区域周向温差和表里温差的影响。计算结果显示不同的浸入起始端对温差没有明显影响。降低浸镀锌液的换热系数 ,采用小角度快速浸入可以降低焊缝区域温差。为了降低焊缝区域的温差 ,建议热浸镀时由底板端快速浸至焊缝上方 30mm以上。
The surface heat transfer coefficient of high-zinc rod immersion zinc coating was measured through experiments and the distribution of temperature field in the weld zone was analyzed. The three-dimensional finite element model was used to quantitatively study the influence of immersion start, immersion angle, velocity, depth and The effect of heat transfer coefficient fluctuation on the circumferential temperature difference and the temperature difference between the surface and the base of weld seam in the pole seat. The calculated results show that different immersion start points have no significant effect on temperature difference. Reduce the heat transfer coefficient of immersion zinc plating, using a small angle of rapid immersion can reduce the weld temperature difference. In order to reduce the temperature difference in the weld zone, it is recommended that the hot-dip coating be quickly dipped to 30 mm or more from the bottom end of the weld seam.