Plasma transferred arc (PTA) welding gives minimal distortion and high resistance to chipping on parts subject to corrosion, thermal shock, severe abrasion, slurry erosion, or extreme impact forces. A revolution in hardfacing, the full scope of the advantages of this method is still being realized. McCoy is a pioneering company in the use of PTA welding.
PTA welding is a high-energy, low-heat, inert gas welding process that—because of the rapid rate of solidification—produces very high-quality, dense deposits with minimum dilution and deformation to the base material. Minimal distortion and high resistance to chipping is a result of the dense metallurgical structure, which is free of voids, oxide films, and discontinuities. On average, there is from 2% to 5% dilution in the base material, yet the life of the component is increased by anywhere from 2 to 50 times, depending on the component and PTA powder used.
Meeting Your PTA Needs
You need overlays that are resistant to impact, wear, abrasion, and corrosion. We're ready to deliver what you need with our single- or multi-pass capabilities. We overlay ODs and IDs with many hardfacing alloys, as well as corrosion-resistant materials such as tungsten carbide and high-nickel alloys. But we don't stop there. Our facility goes far beyond traditional tungsten carbide PTA powder applications to include Inconel, Stellite, Colmonoy, and chromium carbide powders, and our extensive experience includes applying non-magnetic overlays specific for downhole drilling tools such as flex collars.
Other applications of PTA include:
- Downhole tools
- High-wear piping components
- All ground engagement equipment for the oilsands market
- Crusher teeth
- Breaker screens
- Valve components
- Slurry transport
- Areas where traditional wire-based chromium carbide is not providing significant protection from wear
Full Service
PTA coatings can be ground or machined, depending on the alloy applied. After hardfacing, let McCoy handle your grinding. We can machine or grind almost any surface on which PTA has been applied. It’s just another way we are working to grow into your full-service energy products and services company.
