PTA Weld Overlay
PTA is a controlled weld overlay process that deposits thick, metallurgically bonded hardfacing layers on parts operating under wear, impact and high loads.
When is it the right choice?
PTA is chosen when a thicker deposit than thermal spray, a strong metallurgical bond and weld-based rebuilding of worn geometry are required.
Selection Based on Project Conditions
What does it deliver when used correctly?
- Ability to build thick wear-resistant layers
- Metallurgical bond
- High abrasive wear resistance with carbide particles
- Can be combined with geometry restoration
FAQ
What is PTA weld overlay (hardfacing)?
PTA (Plasma Transferred Arc) is a hardfacing process in which a powder or wire filler alloy is melted by a plasma arc and metallurgically fused onto the base material. Compared with thermal spray processes, it produces thicker layers with low dilution.
Which alloys are applied by PTA?
Cobalt-based Stellite grades, NiCrBSi alloys and nickel-based powders with tungsten carbide additions are commonly used. The alloy is selected according to the type of wear and the level of impact.
When is PTA preferred over HVOF?
PTA is considered where there is major dimensional loss, heavy impact or a need for a metallurgical bond; HVOF is considered for thin, dense surfaces with tight tolerances. For a detailed comparison, see our HVOF vs PTA guide.
How thick can a PTA overlay be?
The typical range is a few millimetres (generally 2–8 mm). The required thickness is determined by the wear depth of the part.
Is It Right for Your Part?
Send us photos, technical drawings and operating conditions, and we will evaluate the process and material system together with you.