Abstract
Arc phenomenon and wire fusion in the arc spraying of aluminium and stainless steel are ovserved by a high speed camera. Arc voltage and arc curernt are measured by an oscilloscope. The whole arc spraying process from the wire fusing stage to the particle adhesion is investigated.
Main results of the experiments are summarized as follow;
(1) The arc fluctuates periodically with the period of 0.6-1.2 ms long in this study.
(2) The fused metal flies in the band like shape at relatively low speed in the arc flame.
(3) Arc voltage fluctuates within 50% of its average value corresponding to the motion of the arc under the normal spraying condition, however, the short circuit does not occur.
(4) The fluctuation of arc voltage depends on the spraying condition and material, and it is closely related with the adhesion strength of sprayed coatings.
