Twin-carbon arc welding

It was switched on by operating bringing two electrodes closer by a mechanism which also adjusted arc length.

[2]: 75  In case a DC supply is used, the positive electrode will disintegrate and consume at a much faster rate as compared to negative electrode, because two-thirds of the total heat is generated at the positive anode.

In AC welding, because of alternate reversals of polarity, both the electrodes will be affected equally and present no problem.

The magnitude of arc current required for welding depends upon both electrode diameter and plate thickness.

[4] A simple version of a TCAW apparatus was designed in Ethiopia, it has reduced costs and improved the accessibility of welding services.