PAW受控脉冲穿孔状态的检测与控制  

Sensing and control on the keyhole condition during controlled pulse key-holing plasma arc welding

作　　者：贾传宝[1] 武传松[1] 张裕明 

机构地区：[1]山东大学材料连接技术研究所,济南250061 [2]Center for Manufacturing,University of Kentucky,lexington,KY40506,USA

出　　处：《焊接学报》2009年第2期4-8,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金项目资助(50540420570);中国机械工程学会焊接学会创新思路预研经费资助(07-12-002)

摘　　要：根据受控脉冲穿孔的控制策略,研制出等离子弧焊接(PAW)小孔状态的检测与控制系统,采用等离子弧尾焰电压作为表征小孔状态的传感检测信号,对不同焊接电流作用下的焊接过程进行实时监测,系统可以同时采集焊接电流和尾焰电压信号,并对信号进行分析、处理,建立了焊接电流、尾焰电压和背面熔宽三者之间的定量关系曲线.结果表明,尾焰电压信号能够迅速准确地反映出小孔状态和焊缝背面熔宽.根据检测试验得到的数据,建立穿孔型PAW焊接闭环控制系统,通过对普通平板和改变散热条件工件进行闭环控制焊接试验,获得了适当的焊缝背面熔宽及良好的焊缝质量,证明了该系统运行稳定、可靠.According to the strategy of controlled pulse key-holing,a new sensing and control system is developed for monitoring and controlling the keyhole condition during plasma arc welding(PAW).Through sensing and processing the efflux plasma voltage signals acquired during the welding processes with different levels of welding current,the quantitative relationship of the welding current,efflux plasma voltage and backside weld width of the weld is established.PAW experiments show that the efflux plasma voltage can reflect the state of keyhole and backside weld width accurately.Based on this,welding experiments under closed-loop control are conducted on ordinary plate and workpiece with varied thermal conditions,which have validated the stability and reliability of the developed keyhole PAW system.

关 键 词：受控脉冲穿孔 尾焰电压 小孔 等离子弧焊 

分 类 号：TG444[金属学及工艺—焊接]