铝合金脉冲MIG焊接弧长控制系统

Study on arc length control system for pulsed MIG welding of aluminum alloy

针对铝合金脉冲M IG焊接过程中的弧长稳定性问题,建立了弧长控制系统模型,设计了基于比例切换函数的滑模控制器,并采用基于xPC的实时目标环境,建立了铝合金脉冲M IG焊接快速原型的控制平台.利用MATLAB/SIMULINK进行了弧长控制仿真分析,在建立的快速原型控制平台基础上,进行了铝合金脉冲M IG焊接弧长控制试验.结果表明,利用滑模控制器建立的快速原型控制系统可以实现铝合金脉冲M IG焊接弧长的良好控制,动态响应快、弧长控制稳定,对外部扰动与系统参数摄动具有较强的鲁棒性,保证了铝合金脉冲M IG焊接过程的稳定性.

Research work of wire extension control based on vision sensing was done in pulsed MIG welding process of aluminum alloy.A rapid prototyping control platform was established for pulsed MIG welding of aluminum alloy using real-time target environment based on xPC.With vision sensing of welding zone image and corresponding image processing algorithm,a fuzzy PID closed loop control system for wire extension was designed on the basis of the built rapid prototyping control platform.Then experimental results showed that the method of vision sensing could meet the control requirements of wire extension stability,the rapid prototyping control system built with fuzzy PID controller based on vision sensing could realize the well control of the wire extension in pulsed MIG welding of aluminum alloy and also had strong robustness and quick response ability.