工艺参数对铝合金双脉冲MIG焊焊缝成形的影响  

Influence of processing parameters on weld forming in double-pulse MIG welding of aluminum alloy

作　　者：姚屏[1,2] 薛家祥[1] 蒙万俊[1] 朱思君[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广州510640 [2]广东技术师范学院机电学院,广州510635

出　　处：《焊接学报》2009年第3期69-72,共4页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50875088);广东省科技计划基金资助项目(2008B010400006)

摘　　要：双脉冲MIG焊在进行高效铝焊接的同时可获得美观的鱼鳞纹焊缝表面．在单脉冲稳定焊接的基础上，针对自行开发的双脉冲MIG焊逆变电源，分别改变电流、高频频率、低频频率、焊接速度，进行双脉冲焊接铝合金的试验研究．结果表明，强弱脉冲峰值电流和高频频率对焊接过程的稳定性和飞溅有较大的影响，强弱脉冲峰值电流相差40A，高频频率250Hz时焊缝成形好．在一定范围内，焊缝鱼鳞纹宽度与低频频率、焊接速度直接相关．具体而言，焊缝鱼鳞纹宽度随着低频频率的提高而减小，随着焊接速度的提高而增大，并根据统计规律得出了一个经验公式，用以定量反映这种变动关系．当焊接速度与低频频率比值为0．19～0．30时，鱼鳞纹宽度在2-3mm之间，焊接效果较好．Double-pulse MIG welding of aluminum alloy can improve the efficiency of welding and meanwhile get beautiful weld surface with scaly figures.Based on single-pulse welding,the experiments of double-pulse MIG welding of aluminum alloy were carried out by changing the current,high-frequency,low-frequency and welding velocity of the power which is the self-developed double-pulse MIG welding inverter power.Tests shows that strong/weak pulse peak current and high-frequency have great influence on the stability of welding process and spatters.When the difference between strong and weak pulse peak current is 40 A and high-frequency is 250 Hz,the weld forming is good.To a certain extent,the width of the scaly figure on the weld surface is directly related to low-frequency and welding velocity: the width of the scaly figure will decrease with the improvement of low-frequency and widen with acceleration of welding velocity.An empirical formula reflecting the relationship between low-frequency,welding velocity and the width of the scaly figure through statistical methods is obtained,and the results show that when the ratio of welding velocity to low-frequency is from 0.19 to 0.30,the width of the scaly figure is from 2 to 3 mm,which means good welding performance.

关 键 词：双脉冲焊 高频频率 低频频率 焊接速度 鱼鳞纹宽度 

分 类 号：G434[文化科学—教育学]