MIG熔接における自己制御特性の原因について

Abstract

In this papea, we report the effect of IR drop in electrode and net arc energy on the so-called self requlating characteristics of MIG Welding. The radiant heat from molten pool of base metal is too small to explain the phenomena, as shown in the previous paper (Japanease W.J. Vol. 25 No. 2 1956).It must be noticed that, when we ajusted arc length shorter, the part of electrode from feeding contact point to, the arc becomes longer, in ordinary adjustment (Fig. 1-B). To separate the causes of the phenomena, we measured the melting speed when the arc length and wire length from the feeding contact point to the arc are changed respectively as shown Fig.1.According to our expeaiment, about 15% of the increase of the melting speed when the arc length is ajusted shorter, (which is the characteristics of the so-called self regulation), is due to the increase of the joule's heat above mentioned. See Table 1 & 2. Fig. 3 show the variation of the dorp along the wire of 100mm length when the same current is flowed. IR drop in Table 1 & 2 are estimated from those occillograms.The increase of electrode drop of arc when the arc is ajusted shorter, which is discussed in the previous paper, may explain to remainder.