逆变GMAW焊机短路过渡波形控制研究

为了实现对GMAW焊短路过渡过程精确和优化控制,首先研究短路过渡不同阶段的熔滴过渡过程,在充分利用IGBT逆变GMAW焊机优异的动态响应性能的基础上,研究了多种不同的短路过渡波形控制方式,并提出一种短路燃弧状态控制法.当短路发生后,电流先保持在一较低值,然后以斜率可以调节的双折线规律上升.在燃弧阶段,调节控制回路参数,控制燃弧电流的变化速度,保证充足的燃弧能量.实验表明,采用该种控制方式的GMAW电源可以有效的减少焊接飞溅,改善工艺性能.

Research on waveform control of Gas metal arc welding

Analyzed the characteristic of short circuit droplet transfer and researched on wave controlled short circuit transfer on the basis of IGBT inverter power source. Developed a new kind of short circuit - arc stage control system. At the beginning of the short circuit, the output current could be kept at a low level, then it will rise at a high speed at first and a lower speed a short time later, in which period, the rising speed of short circuit current could be adjusted. During the arc time, changing rate of current could be adjusted by modulating the parameter of the control circuit, which ensures the proper output power of the arc. It is proved that the spatter rate could be reduced to a very low level with this new kind of wave control circuit, and weld bead is improved.