标题：Sensing controlled pulse key-holing condition in plasma arc welding
作者：Jia Chuan-bao; Wu Chuan-song; Zhang Yu-ming
作者机构：[JIA Chuan-bao] Shandong University, 济南, ShanDong 250061, China.;[WU Chuan-song] Shandong University, 济南, ShanDong 250061, China.;[ZHANG Yu-ming] 更多
通讯作者地址：[Wu, CS]Shandong Univ, Inst Mat Joining, Jinan 250061, Peoples R China.
关键词：controlled pulse key-holing;efflux plasma voltage;keyhole;plasma arc welding
摘要：According to the strategy of controlled pulse key-holing, a new sensing and control system was developed for monitoring and controlling the keyhole condition during plasma arc welding (PAW). Through sensing and processing the efflux plasma voltage signals, the quantitative relationship among the welding current, efflux plasma voltage and backside weld width of the weld was established. PAW experiments show that the efflux plasma voltage can reflect the state of keyhole and backside weld width accurately. The closed-loop control tests validate the stability and reliability of the developed keyhole PAW system.