铝合金LB-RSW焊接中RSW温度场的数值模拟

Numerical simulation of RSW temperature field during aluminum alloys LB-RSW

使用Ansys软件进行了"激光束—电阻缝焊"(LB-RSW)中电阻缝焊(RSW)过程的热结构和热电的循环顺序分析,研究了缝焊电流、焊接速度和滚盘间距对铝板RSW温度场的影响.结果表明,铝板表面温度及滚盘前、后方的温度梯度随着缝焊电流的增加而升高或增大,温度的最高值与缝焊电流的平方近似成正比关系;铝板表面温度随着RSW速度的升高而降低,升降温速度随着焊接速度的增加而增大;铝板表面的最高温度随着滚盘间距的增加而降低,滚盘后方的温度梯度随着滚盘间距的增加而减小.模拟结果与热成像照片吻合良好,为预测激光与电阻热源复合最佳匹配位置和LB-RSW机理研究奠定了基础.

The thermo-structural and thermo-electrical circular order analyses of resistance seam welding(RSW) process in laser beam-resistance seam welding(LB-RSW) were carried out by means of ANSYS,and the influences of RSW current,welding speed and the space between two RSW wheels on temperature field in RSW were studied.The results indicate the surface temperature of aluminum alloy plates and the temperature gradients both in front and back of wheels increase consequently with RSW current increasing.Meanwhile,the maximum temperature value presents direct ratio relationship with the square of current approximately.The surface temperature of aluminum alloy plates reduces with the increase of welding speed.However,the rate of temperature change appears a converse tendency when the welding speed increases.Besides,the maximum surface temperature of aluminum alloys plates decreases with the decrease of the space between two RSW wheels.Furthermore,the temperature gradient behind the RSW wheels also decreases when the space between the two wheels decrease.The simulation results match well with the thermography acquired by infrared thermography technology,which makes it feasible to predict the optimal relative position between laser beam and resistance heat source and to investigate the mechanism of LB-RSW.