On Welding Conditions of CO2-O2 Arc Welding (Report 1)
Relations between Welding Condition and Oscillogram of Arc
1961 Volume 30 Issue 1 Pages 23-29
Details
1961 Volume 30 Issue 1 Pages 23-29
In case of the rising or constant potential type power source for CO2-O2 arc welding, the open voltage is variable, unlike the case of drooping type power source, which has ordinaly a constant open voltage. This experiments were carried out in order to get enough knowledge about effects of open voltage on the arc-state and to select the optimum welding conditions for CO2-O2 arc welding.
Using a constant potential type rectifier and a rising type motor generator on the market, many oscillograms of welding arc were taken under various welding conditions. Arc times, numbers of momentary short circuit per unit time and times to start arc were measured on the oscillograms.
The experimental results are as follows :
1. The arc time reaches 100% when open voltage of C.P.R. is over 32V and that of R.M.G. over 16V, or when arc voltage is over 22V in the cases of both power sources.
2. The number of momentary short circuit decreases remarkably with the increment of open voltage. And the number reaches zero at about 32V of arc voltage.
3. The higher open voltage, the more easily an arc starts. The starting of arc with the used R.M.G. is not as good as the C.P.R..
