Arc Spraying

Arc spraying is the highest productivity thermal spraying process. A DC electric arc is struck between two continuous consumable wire electrodes that form the spray material. Compressed gas (usually air) atomises the molten spray material into fine droplets and propels them towards the substrate.

The process is simple to operate and can be used either manually or in an automated manner. It is possible to spray a wide range of metals, alloys and metal matrix composites in wire form. In addition, a limited range of cermet coatings (with tungsten carbide or other hard materials) can also be sprayed in cored wire form, where the hard ceramic phase is packed into a metal sheath as a fine powder. The table shows the typical performance of arc spraying compared with other thermal spraying processes.

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