Twin-carbon arc welding

Unlike single-carbon arc welding, in twin-carbon arc welding (TCAW) the arc is maintained between two carbon (graphite) electrodes: 22  held in a special holder.: 67  The Ac current was usually used. It was switched on by operating bringing two electrodes closer by a mechanism which also adjusted arc length. The two electrodes touch momentarily, then separate and thus an arc is established. TCAW is unshielded and no artificial pressure is applied.: 22 

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