正弦波和单脉冲MIG焊薄片铝合金方法研究

Research on contrasting monopulse and sinusoid modulated pulse MIG welding methodology for sheet aluminum alloy

针对铝合金焊接稳定性、控制参数优化与鲁棒性等问题,特别是铝合金薄片极易焊穿等难点,通过引入降能系数kt、正弦波电流振幅系数kAI以及时间振幅系数kAt等,分别建立了通用的单脉冲与对称正弦波调制脉冲MIG焊接参数关系式,且分别进行了1 mm薄片铝合金焊接试验验证其可行性。经试验对比证实了正弦波调制脉冲MIG焊方法具有焊接参数取值范围宽、鲁棒性好、易于操控、能稳定地获得理想的鱼鳞纹焊缝等显著优点,为研制能够顺利进行厚度小于1.5 mm薄片铝合金焊接的稳定的高性能焊机提供了新的理论和实验基础。

On problems of the stability,control parameter optimization and robustness in aluminum alloy welding,especially on difficulties that aluminum alloy sheets is very easy perforation in welding process,By introducing the decrease energy coefficient kt,sinusoid current swing coefficient kAI and time swing coefficient kAt,this article respectively established the universal relationship formulas of parameters in the monopulse MIG welding and the symmetry sinusoid modulation pulse MIG welding.And processing 1 mm sheet aluminum alloy welding tests respectively validated their feasibility.The test contrast has validated that the sinusoid modulation pulse MIG welding has distinct advantages,such as large welding parameter working confine,good robustness,easy control and steadily producing ideal ripple weld seam,etc.,and provides a new theoretical and test foundation on developing of stable and high performance welding machines to be able to process less 1.5 mm sheet aluminum alloy welding.