KEYHOLE STABILITY AND SENSING INPLASMA ARC WELDING PROCESS

摘要

Stable keyhole and constant joint penetration are critical in ensuring weldrnquality during keyhole plasma arc welding (PAW). Understanding of the keyhole isrnfundamental for developing a sensor to monitor the stability of keyhole PAW and thernvariation in the joint penetration. Because the back-side width of weld pool is sensitivernto the stability of the keyhole and the variation in the penetration, an efflux plasmarncharge sensor (EPCS) is proposed to monitor the back-side width of the weld pool. Arnlinear model has been established to estimate the penetration from the sensor signal.rnExperiments verified the potential of the proposed sensor in monitoring stability ofrnkeyhole.