Study on Multiple Composed Electrode (Report 1)

About single source type and multiple source type

Abstract

Regarding covered arc electrode, hitherto various studies and developments have been made for the improvement of the welding efficiency.
In these studies, using the multiple composed covered electrode, that is, metal wire and metal pipe lapped and flux coating layer provided respectively (see Fig.1), the characteristics of welding arc were investigated.
This new type of the electrode was available for 3 kinds of wire connecting methods, as shown in Fig.2, and comparison was carried out between them.
The results showed that by double source type in which the current in either side of core wire or core pipe became comparatively high, the melting rate was increased. As the respective current densities became equal, the melting rate was decreased and became about equal to the melting rate of single source type (see Fig.9).
Using this welding electrode, specially when the current was supplied to the core wire only, the melting rate was most increased and it was found that thermal efficiency was also increased.