双弧脉冲MIG焊专用电源设计及试验分析

Design of special power source for dual-arc pulsed MIG welding and test analysis

双弧脉冲MIG焊是一种低能量输入焊接方法,其原有的双电源供电系统结构复杂、协同控制困难、易受干扰.为此提出了双弧脉冲MIG焊一体化专用电源的设计思路,将主弧和旁弧两路脉冲电流使用同一控制系统进行统一协调控制.设计了基于有限双极性全桥逆变的主电路和基于DSP2812的控制电路,搭建了一体化专用电源系统整体模型,并通过仿真验证了其可行性.在此基础上,利用设计的专用电源原型机进行了铝钢低能量焊接工艺试验.结果表明,一体化专用焊接电源能够满足双弧脉冲MIG焊低能量焊接的要求,在低能量输入下可以获得较好的焊接效果.

Dual-arc pulsed MIG welding is a low-energy input welding method. The original dual pulse power supply system employed in dual-arc pulsed MIG welding is complex,difficult to control and susceptible to interference. For this problem,a design scheme of integrative special power supply for dual-arc pulse MIG welding was proposed. The synergetic control of two pulse current flowing through main and bypass arc was achieved by the same control system. A main circuit based on the limited bipolar full bridge inverter and a control circuit based on DSP2812 were designed. Then,the model for integrated special power supply system was built and the feasibility of the design scheme was verified by simulation. On this basis,low-energy input welding tests were also carried out to join aluminum alloy to galvanized steel. The results showed that the designed integrative special power supply can meet the requirement of dual-arc pulsed MIG welding and well welding quality can be achieved under low-energy input conditions.