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Plasma spray can be used to produce coatings. of virtually any metallic, cermet, or ceramic ma-. terial. The coatings are used for most of the types. of applications described in a subsequent section. The transferred plasma-arc process adds to. plasma spray the capability of substrate surface heat-. ing and melting. Figure 7 is a schematic repre-. sentation of the process.
For gas tungsten arc welding (GTAW), pure argon is more commonly used as a shielding gas. Helium/argon mixtures can be used for applications that require high heat transfer, but those applications arenât widespread. Pure helium or mixtures with a high percentage of helium sometimes are used with GTAW machines with direct current electrode negative.