Thermal Spray is used to build up surfaces on both new and damaged machinery components. The built up surface is typically added to mitigate wear, prevent corrosion or for dimensional restoration.
Thermal spray creates a mechanical bond between the parent material (substrate) and the applied material. Different materials exhibit different bond strengths and porosity levels. Wynnum Engineering will recommend and supply the appropriate material and can supply material composition certificates (unless proprietary). Wynnum Engineering can arrange metallographic inspection on sample coupons if required.
Parts requiring Thermal Spray must be grit blasted prior to the application of the desired material. As such, some parts may require dis-assembly or may not be a suitable candidate for Thermal Spray. If this is the case, Wynnum Engineering will recommend an alternative repair utilizing a welding process or a mechanical repair such as sleeving.
It is also important to note that in most cases any NDT (Dye Penetrate or Florescent Penetrate Inspections) should be carried out on the substrate rather than a coating due to the risk of inherent porosity generating a false result.
Wynnum Engineering utilizes the following Thermal Spraying methods:
Twin Wire Arc Spraying
Flame Powder Spray
Flame Wire Spray
Spray and Fuse
Commonly applied materials:
Nickel / Iron alloys
High Chromium content alloys
Molybdenum
Stainless steels
Cupronickel
Aluminium Bronze
Aluminium and Zinc alloys
Stellite brand materials and equivalents
Bronze
Ceramics
Other anti-wear materials upon request
