Plasma-transferred arc welding (PTA welding) is a thermal process for applying wear and corrosion resistant layers on surfaces of metallic materials. The highly energetic plasma arc melts the surface of the base material. At the same time, the powdery filler material is inserted into the arc and also molten. During solidification, a substance-to-substance bond between the filler material and the base material is created.
The advantages of this process are a low dilution rate, a small heat-affected zone and a high deposition rate. The production of the powdery filler material is easier compared to similar welding wires and welding rods. Thus, many surface properties needed for special applications can be economically produced.