铝-铜异种材料对接搅拌摩擦焊温度场数值模拟

Numerical simulation of the temperature field for butt friction stir welding of dissimilar 6061-T6 and T2 alloys

根据铝-铜异种材料对接搅拌头偏置搅拌摩擦焊接特点,利用ANSYS软件,模拟焊接过程中的瞬态变化温度场以及焊缝区域各点的热循环曲线.通过对比分析了移动焊接稳定阶段焊缝横向、纵向及厚度方向各点的最高温度变化;对比不同焊接参数的变化对焊接温度变化的影响,确定主要影响因素为搅拌头转速.通过试验采集特征点热循环曲线与模拟比较的结果吻合度良好,验证了热源模型与散热模型的准确性.温度场模拟结果表明,异种材料偏置搅拌摩擦焊过程中温度最高值出现在焊缝中心偏铝合金侧位置.

Based on the offset friction stir welding( FSW)characteristics of the Al-Cu dissimilar,the ANSYS software was used to simulate the transient temperature field and the welding thermal cycle curve of the fusion zone during the welding process. The maximum temperature in the transverse,longitudinal and thickness directions of the weld during the welding stabilization stage were compared and analyzed. The effect of the welding parameters on the welding temperature was investigated.The results showed that the rotation speed played a leading role in the welding temperature field. The computed results were in good agreement with the actual thermal cycling curve of feature points,which verified the accuracy of the heat source model.The results of the simulated temperature field indicated that the peak temperature appeared in the position of the partial aluminum alloy side of the weld center.