新型双脉冲MIG焊接电源
Research of a novel double-pulsed MIG welding power supply
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摘要: 为提升双脉冲MIG焊接设备的整体性能，研制了一台基于全碳化硅功率器件的双脉冲MIG逆变焊接电源，逆变频率可达100 kHz，有利于实现电弧的精细化控制.以STM32F405RGT6为控制核心，搭建了逆变焊机的控制系统硬件电路，其由主控制电路、数字面板以及送丝控制电路等构成.根据双脉冲MIG焊的任务需求设计了相应的控制软件，采用增量式PID算法控制输出量，通过单脉冲输出+脉动送丝控制，实现双脉冲焊接.结果表明，所研制的逆变焊接电源具有快速的动态响应，能有效配合脉动送丝进行焊接，焊缝鱼鳞纹清晰，无明显缺陷.Abstract: In order to improve the overall performance of double-pulsed MIG welding equipment, a novel welding power is developed based on silicon carbide power devices. The inverting frequency is up to 100 kHz, which is beneficial to precisely control welding arc. Control circuit of the proposed welding power is composed of the main control circuit, a digital panel, wire feeder control circuit, in which STM32F405RGT6 is the control core. A corresponding control software is designed according to double-pulsed MIG welding task requirements. The incremental PID algorithm is used to control the output and double-pulsed welding is realized by single pulse output with pulsating wire feeding. Test result shows that the proposed welding power supply has a fast-dynamic response, which can effectively cooperate with the pulsating wire feeding to weld. The fish scales of the weld are clear without obvious defects.
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