The industrial wire-arc spraying systems that are designed and manufactured by different
companies are all based on concepts discussed in section 1.1.2.1. However, they differ in the
geometry of the torch, the wire-diameter, the feed mechanism for the wires, and the location
where the tips of the wires are located with respect to the torch geometry. In this study, the
ValuArc 200 Twin-Wire-Arc Spraying Gun, manufactured by Sulzer-Metco (Westbury, NY)
was used. Detailed engineering drawings of this gun are presented in Chapter 2, section 2.2.
The parameters that can be controlled in most wire-arc spray systems and affect the
microstructure of the produced coatings include