基于组合热源模型的中厚板MIG焊模拟

MIG welding simulation of medium plate based on combined heat source model

为实现对复杂形状熔池下中厚板MIG焊过程的准确模拟,通过提取焊缝熔合线,拟合多项式方程,建立了具有特殊空间分布的电弧+熔滴组合热源模型。分别基于该模型和双椭球热源模型对6 mm厚6082-T6铝合金MIG焊进行了有限元模拟,计算了焊接温度场和焊后应力场。结合两种热源模型的模拟结果,从实际焊缝形状、热循环曲线、应力分布测量值三方面进行对比分析。结果表明,组合热源模型调节参数少,其温度场能更好地反映复杂形状熔池,应力场与实测值吻合度更高,适合开坡口的中厚板MIG焊过程模拟。

In order to accurately simulate the MIG welding process of medium thick plate under complex shape molten pool,a combined heat source model with special spatial distribution of arc+droplet was established by extracting the weld fusion line and fitting the polynomial equation.Based on the model and the double ellipsoid heat source model,the finite element simulation of 6 mm thick 6082-T6 aluminum alloy MIG welding was carried out,and the welding temperature field and post-welding stress field were calculated.Combined with the simulation results of the two heat source models,a comparative analysis was made from the actual weld shape,thermal cycle curve and stress distribution measurement values.The results show that the combined heat source model with weld fusion line has fewer regulating parameters,the temperature field can better reflect the complex shape of the weld pool,and the stress field is more consistent with the measured value,so it is suitable for the simulation of MIG welding process of medium thick plate with groove opening.