Temperature of the base metal during coating, monitored by infrared pyrometer, thermocouple or temperature-indicating crayon. Many specs cap it around 150 to 200 °C to avoid oxidizing the bond line, softening heat-treated parts and building excess residual stress, while some ceramic and DVC processes deliberately run hotter. It is managed with surface speed, cooling air and pauses between passes.
Pyrometer says substrate temperature is 340 F, stop and let it cool, the spec max is 300.
Also heard as
- part temperature
- substrate temp
Related terms
Cooling air
Jets of compressed air or CO2 aimed at the part during spraying to keep its temperature in check.
Preheat
Warming the substrate before spraying to drive off moisture and reduce stress at the coating interface.
Cook
Booth slang for overheating a part during spraying, usually from slow traverse, short standoff or no pauses.
Residual stress
Stress locked into a coating and substrate after spraying, from splat shrinkage, cooling and impact.