基于COMSOL的铝合金激光-MIG复合焊耦合作用研究  

Study on Laser-MIG Hybrid Welding Coupling Effect of Aluminum Alloy Based on COMSOL

作　　者：刘红伟[1,2] 王群[2] 李京龙[1] 马志华[2] LIU Hongwei WANG Qun LI Jinglong MA Zhihua(Northwestern Polytechnical University, Xi＇an 710072, China Ningbo Branch of China Academy of Ordnance Science, Ningbo 315103, China)

机构地区：[1]西北工业大学,陕西西安710072 [2]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《热加工工艺》2016年第19期218-222,共5页Hot Working Technology

基　　金：宁波市创新团队项目(2014B81004)

摘　　要：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 temperature field of arc plasma during laser-MIG hybrid welding process of 7A05 aluminum alloy was simulated by COMSOL software, and the results were compared with high speed photographic results in actual welding process. The results show that when the laser power is high, the temperature fluctuation of action area is small with the increase of MIG current.When the laser power reaches a certain degree, increasing the laser power has little effect on the temperature field of action area.When the heat source distance between the laser and the arc electrode is 2 mm, the platform type temperature appears in the cathode area above the action area, which has great significance to the formation of droplet with steady flow velocity and mass. The arc current of 200 A, the power of 3.5 kW, the heat source distance of 2 mm are optimum process parameters, there is a temperature plateau area near the cathode electrode, and the temperature fluctuation of action area is the least.

关 键 词：7A05 铝合金 CO2 激光 -MIG 复合焊 激光功率 MIG 电流 热源间距 

分 类 号：TG456.9[金属学及工艺—焊接]