In the arc spray process, two wires are inserted into the torch and brought into contact with each other at the nozzle. The electrical load placed on the wires causes tips of the wires to melt when they touch. A carrier gas such as air or nitrogen is used to strip the molten material off the wires and to transport it to the workpiece. Arc spraying is relatively inexpensive, easy to learn, portable, and fairly simple to maintain. Low particle velocities enable high maximum coating thickness for a given material. Recent advancements in nozzle and torch configurations are providing greater control over coating quality and the spray pattern. With the right equipment, it’s possible to produce an elongated spray pattern or to spray components with very small internal diameters. As far as its shortcomings, are spraying is limited to electrically conductive solid wires and cored wires.
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