脉冲旁路耦合电弧MIG焊的动态数学建模及过程控制

发布时间：2018-05-20 10:22

本文选题：脉冲旁路耦合电弧 + 熔化极惰性气体保护焊　；参考：《机械工程学报》2015年20期

【摘要】：脉冲旁路耦合电弧熔化极惰性气体保护(Metal inert-gas,MIG)焊是一种新型的低热输入焊接方法,它通过特定的接法引入旁路电弧与主路电弧实现热、力的耦合,利用旁路电弧的分流作用,实现熔化母材热量与熔化焊丝热量的独立控制,从而在精确控制母材热输入的同时保证熔滴的自由过渡形式,可以实现铝-钢等异种金属的连接。为了理论分析不同焊接参数对焊接过程的影响,通过等效、线性化处理与迭代数值求解算法,建立可以正确描述焊接物理过程的动态数学解析模型;针对焊接过程中耦合电弧稳定性较差且直接影响焊接质量的问题,提出通过检测弧压波动的反馈信号、实时调节送丝速度、进而控制耦合电弧稳定性的闭环控制方案,并基于快速原型系统进行焊接过程控制仿真与试验。仿真结果表明,当焊接过程受到干扰后,采用闭环控制方案可以显著提高耦合电弧的稳定性;焊接试验证明了控制仿真的预测与分析,进行闭环控制后,焊接过程更加稳定同时得到了成形良好的铝-钢异种金属接头。
[Abstract]:Pulsed Bypass coupled Arc Metal inert-gas shielded metal inert-gas MIG welding is a new type of low-heat input welding method, which introduces bypass arc and main arc to realize heat and force coupling through a specific method, and utilizes shunt effect of bypass arc. The heat of melting base metal and welding wire can be controlled independently, which can control the heat input of base metal accurately and ensure the free transition form of droplet, and the connection of dissimilar metals such as aluminum and steel can be realized. In order to theoretically analyze the influence of different welding parameters on welding process, a dynamic mathematical analytical model which can accurately describe the welding physical process is established by equivalent, linearization and iterative numerical solution algorithm. Aiming at the problem that the stability of coupling arc is poor and the welding quality is affected directly, a closed-loop control scheme is put forward to control the stability of coupling arc by detecting the feedback signal of arc voltage fluctuation and adjusting the wire feeding speed in real time. The welding process control simulation and test are carried out based on the rapid prototyping system. The simulation results show that when the welding process is disturbed, the stability of the coupling arc can be significantly improved by using the closed-loop control scheme, and the prediction and analysis of the control simulation are proved by the welding experiment, and the closed-loop control is carried out. The welding process is more stable and a well formed aluminum-steel dissimilar metal joint is obtained.
【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;
【基金】：973计划前期研究专项(2014CB660810) 国家自然科学基金(51165023) 兰州理工大学红柳杰出青年教师培养计划甘肃省自然科学基金资助项目
【分类号】：TG444.74

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