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针对旁路耦合电弧焊的特点,建立了一种适于用旁路耦合电弧焊的复合热源模型.利用该热源模型对不同焊接参数下的旁路耦合电弧焊温度场进行了数值分析,得到了总电流相同时不同旁路电流下的焊缝熔深、母材温度和特征点焊接热循环曲线的模拟结果,分析了旁路耦合电弧焊焊接参数对母材热输入的影响,并将特征点热循环曲线的模拟结果与相同条件下的试验结果进行了比较.结果表明,焊接总电流相同时母材热输入随着旁路电流的增加而降低,且越靠近焊缝母材热输入的降幅越大,特征点焊接热循环曲线的模拟结果与试验结果基本一致,旁路耦合电弧焊温度场模型是合理的,所建立的热源模型能够正确反映焊接参数与母材热输入之间的关系.
Aiming at the characteristics of shunt coupling arc welding, a compound heat source model suitable for shunt coupling arc welding was established. By using the heat source model, the temperature field of shunt coupling arc welding under different welding parameters was numerically analyzed. When the total current is the same, the weld penetration, the temperature of the base metal and the characteristic curve of the welding cycle are simulated. The influence of the parameters of the bypass welding on the heat input of the base metal is analyzed. The simulation results of the thermal cycling curves are compared with the experimental results under the same conditions.The results show that the heat input of the base metal decreases with the increase of the bypass current when the total welding current is the same and the closer the heat input of the base metal The simulation results of the thermal cycling curve of the feature point welding are basically consistent with the experimental results. The temperature field model of the bypass coupled arc welding is reasonable. The established heat source model can correctly reflect the relationship between the welding parameters and the heat input of the base metal.