Re-consideration over the Reliability of Arc Sensor

- Effect of Unstable Factor and its Avoidance Method -

Abstract

Arc sensor is a conventional technique so as to compensate the aiming deviation which causes from the heat distortion or unevenness of work piece. But, at present, only less than 5% of arc welding robot equips arc sensing function. It is hard to use in actual welding line because of occurring of miss sensing. So we began to reconsider over arc sensing in the meaning of reliability. Our approach is separating arc welding process into several physical phenomena, and research how the unstable factors act to the sensing results. And we try to find the countermeasures toward miss sensing.
Our final target is short arc welding. As the road to that target, this report shows the effect of unstable factors to the arc plasma phenomena. So the experiment is performed with TIG welding on copper plate so as to ignore the melting of electrode and workpiece. By analyzing the effect of unstable factor, we proposed the several countermeasures toward miss sensing.