高灯杆热浸镀温度场的有限元分析

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。

Finite Element Analysis of Temperature Distribution in Hot-Galvanizing for High Lamp-Post

The heat exchange coefficient of dipping Zn liquid was determined by experiment and the temperature distribution of welding zone was analyzed using three dimensional finite element model. The effects of processing parameters such as starting position, dipping angle, dipping speed, dipping depth and heat exchange coefficient on temperature difference in circumferential direction and temperature difference between surface and center of welding zone of high lamp-post base were investigated quantitatively. The analysis result shows that there is no obvious effect of dipping from bottom plate or shaft pipe on temperature difference. The temperature difference of welding zone can be decreased with small dipping angle, high dipping speed and low heat exchange coefficient of dipping Zn liquid. To decrease temperature difference of welding zone, it is suggested that the high lamp-post should be dipped from bottom plate quickly to a position 30.0 mm above welding zone.