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采用COMSOL软件对7A05铝合金激光-MIG复合焊焊接过程的电弧等离子体温度进行了数值模拟,并与实际焊接过程的高速摄影结果进行了比较。结果表明:在激光功率较高时,随着MIG电流的增加,作用区的温度波动较小;当激光功率达到一定程度后,再增加激光功率对作用区的温度场影响较小。当激光与电弧电极的热源间距为2mm时,在作用区上方的阴极区出现平台式温度,这对形成具有稳定流速和质量的熔滴状态具有重大意义。电弧电流200 A,功率3.5 k W,热源间距2 mm为较优的工艺参数,此时阴极电极附近出现温度平台区,作用区温度变化最小。
The arc plasma temperature of 7A05 aluminum alloy laser-MIG composite welding was numerically simulated by COMSOL software and compared with the high-speed photographic results of the actual welding process. The results show that when the laser power is high, with the increase of MIG current, the temperature fluctuation in the action zone is small. When the laser power reaches a certain level, the laser power has little effect on the temperature field in the zone. When the distance between the heat source of the laser and the arc electrode is 2 mm, a plateau temperature appears in the cathode region above the active region, which is of great significance for forming a droplet state with stable flow rate and mass. Arc current of 200 A, power of 3.5 k W, heat source spacing of 2 mm for the better process parameters, the temperature near the cathode electrode plateau area, the role of the area temperature changes minimum.