Plasma Transferred Arc Welding
Plasma transferred arc welding is a high-precision welding process using a transferred plasma arc and powder filler. It produces metallurgically pure, wear-resistant surface claddings.
Physical-Chemical Mechanism of Action
Plasma transferred arc welding uses a strong plasma arc to fuse metal. Powder filler is injected and mixed with the melt simultaneously. This results in a homogeneous microstructure without pores or impurities.
Metallurgical Relevance & Risks in Welding
This process produces high-quality, wear-resistant surfaces with minimal porosity and high stress levels. It is particularly suitable for hardfacing workpieces under high load. However, incorrect powder filler or inaccurate control of process parameters can lead to impurities, missing protective layers, or uneven hardness.
Workshop Practice & Action Guidelines
Plasma transferred arc welding requires specialized equipment. The powder filler must be precisely dosed, and process parameters such as voltage, current, and gas flow must be carefully set. The workpiece must be clean and dry to avoid contamination. Proper cooling is crucial to achieve a uniform hardness distribution.