Abstract
A flight process of fused metal in arc spraying is divided into four stages, that is, fusion stage from wire, flying stage in arc plasma, flying stage in the air, and adhesion stage on substrate. The fused metal temperatures are estimated at tow stages on the flight process. One of them, Tc, is estimated at the adhesion stage with a silicone oil calorimeter, and the other, Ti, at the fusion stage by the calculation of heat input.
The following results are obtainable from the steimations,
(1) Tc and Ti depend on a wire feed speed parameter v+/(v++v-), and the Tc versus v+/(v++v-) curve shows a similar shape to the Ti curve, where v+ is the positive electrode side and v- negative.
(2) The temperature Tc at the adhesion stage is higher than temperature Ti at the fusion stage through out the experimental values of v+/(v++v-).
(3) The heating effect of the fused metal in the arc plasma is thought to be greater than the cooling effect of the fused metal in the air. This accounts for the higher temperature attained at the adhesion stage than the temperature at the fusion stage.
