作　　者： ; ; ; ;

机构地区： 北京航空航天大学机械工程及自动化学院

出　　处： 《北京航空航天大学学报》 2009年第1期61-64,112,共5页

摘　　要： 研制出一台超音频直流脉冲TIG(Tungsten Inert Gas)焊电源,对该电源的拓扑结构及工作原理进行了介绍.与常规直流TIG焊电源相比,该电源可输出不同频率、均具有陡峭的上升、下降沿的脉冲电流,电流变化率大于50 A/μs.该电源的基值电流、峰值电流、脉冲电流频率、占空比等焊接工艺参数调节方便,使该电源不仅能够焊接薄板,而且能够适用于中厚板的焊接.通过对比常规直流TIG焊和超音频直流脉冲TIG焊焊接的1Cr18Ni9Ti奥氏体不锈钢焊缝的微观组织,发现采用超音频直流脉冲TIG焊工艺的焊缝粗晶区变窄,晶粒细化现象显著.试验结果表明:所研制的超音频脉冲TIG焊电源具有良好的弧焊适用性. An ultrasonic frequency pulse tungsten inert gas welding power source was developed. The power source topology and work principle were introduced. By contrast with current waves output from conventional tungsten inert gas welding power source, faster rising and falling pulse current edges were output from this power source at every ultrasonic pulse frequency. The pulse current change rate was up to 50 A per micro- second. The power source was suited for welding not only sheet metal, but also medium and thick metal for base current, peak current, duty, pulse current frequency and other weld technology parameters expediently adjusted. By comparing with 1Cr18Ni9Ti austenitic stainless steel joints welded by conventional tungsten inert gas welding, these joints welded by the ultrasonic frequency pulse tungsten inert gas welding were shown grain refinement and narrow coarse grain zone in weld beads. The experiment results show that the ultrasonic frequency pulse tungsten inert gas welding power source is applicable to arc welding.

关 键 词： 超音频脉冲 焊 细化晶粒

领　　域： [金属学及工艺]