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Drawn Arc Welding
Short cycle drawn arc welding technique is extensively used in our work and has been demonstrated to be absolutely trustworthy. It provides very resistant joints in very short run times, being ideal in applications when high mechanical loads are transmitted: Refractory support, steel structures, bridge constructions, composite slabs, etc.
The technique is to establish an intense electrical arc between the anchor and the base piece, which fuses the surfaces in contact. At the end of the arc, the anchor is pressed into the molten bath through a mechanism of the welding gun solidifying both of them simultaneously.
The duration of the electrical arc is between 0.1 to 1 second, the total welding time is short and the productivity high.
In the short space of time that the welding bath remains molten, it is protected from atmospheric influence by a ceramic ring or an inert gas flow, which covers it all. This provides a clean and uniform welding bead.
The anchor end to be welded is prepared to allow the electrical arc to be established easily and uniformly across the whole surface. This is achieved by fluxing the end using a ball or aluminum spray, depending on the diameter of the anchor.
In those cases in which this quick welding technology is not applicable, our company carries out jobs using the usual electrode method: TIG or MAG.