脉冲DE-GMAW过程熔滴受力分析及电流波形设计研究

发布时间：2018-06-24 04:36

本文选题：脉冲旁路耦合电弧熔化极惰性气体保护焊 + 熔滴受力分析　；参考：《机械工程学报》2015年14期

【摘要】：针对为了实现铝-钢高效高质量的连接,提出一种高效低热输入的脉冲旁路耦合电弧熔化极惰性气体保护焊(Double-electrode gas metal arc welding,DE-GMAW)方法。为了使其焊接过程熔滴平稳过渡,分析旁路电弧对熔滴过渡时电流密度的影响,确定脉冲DE-GMAW熔滴过渡时电磁力的作用机制,在主路为脉冲电流情况下,分别设计旁路波形与主路组合形式即为恒定电流、交替脉冲电流和同步脉冲电流三种形式的研究,并使用高速摄像拍摄熔滴过渡图像,进行对比分析试验验证。结果表明,焊接电流波形及组合形式不同会导致作用于焊接熔滴的受力发生改变,从而使得焊接过程的稳定性与焊接质量也发生变化,对比分析得出采用同步脉冲电流时的脉冲旁路耦合电弧熔化极惰性气体保护焊焊接过程稳定、熔滴过渡均匀一致且焊缝成形平整美观。
[Abstract]:In order to realize the high efficiency and high quality connection between aluminum and steel, a pulse bypass coupled arc inert gas welding (DE-GMAW) method with high efficiency and low heat input was proposed. In order to make the droplet transfer smoothly in the welding process, the influence of bypass arc on the current density of droplet transfer is analyzed, and the mechanism of electromagnetic force during the pulsed DE-GMAW droplet transfer is determined. The combined forms of bypass waveform and main circuit are designed to be constant current alternating pulse current and synchronous pulse current respectively. The image of droplet transfer is captured by high speed camera and compared with the experimental results. The results show that the variation of welding current waveform and combination will result in the change of the force acting on the welding droplet, and the stability and quality of the welding process will also be changed. The results show that the welding process is stable, the droplet transfer is uniform and the weld formation is smooth and beautiful when the pulsed pulse current is used.
【作者单位】：兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;长城汽车股份有限公司汽车技术中心车身工程研究院;
【基金】：国家自然科学基金(51165023) 兰州理工大学红柳青年培养计划(Q201202)资助项目
【分类号】：TG444.74

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