Abstract
The results of measurement of the parameters which represent the fluctuating properties of the light from arc plasma are described, following the previous report, and some considerations are made in order to clarify the mechanism of the fluctuation.
The rasults are as follows;
1) The fluctuation of the light of comparatively high frequency (angular frequency >30) is due to the repeating process, in which the tip of the wire melts and grows up to the globule, then the globule parts from the wire, and that of comparatively low frequency (angular frequency=2π-6π) is due to the alternation of the arc generating point which is caused by globular transfer.
2) The fluctuation of the light in dip transfer CO2 arc is caused by the short and refiring cycle of the wire to the work piece.
3) The arc becomes stable and the fluctuation disappears gradually according as the gas mixing ratio of Ar to CO2 becomes large and the melted metal of the wire begins spray transfer.
