Thermal plasma conductivity
The conductivity of the ionized gas in a plasma welding torch, which transfers thermal energy from the arc core to the workpiece edges.
Physicochemical Mechanism of Action
Thermal plasma consists of free electrons and ions. These carry the thermal energy of the arc from the center to the workpiece surroundings, thereby heating the metal.
Metallurgical Relevance & Welding Risks
High plasma conductivity ensures rapid and even heating of the workpiece. This prevents uneven distortion and improves weld quality. However, too low a conductivity can lead to inaccurate temperatures, resulting in porosity or inconsistent microstructure.
Workshop Practice & Action Items
Ensure the plasma gas is correctly dosed and ionized. Monitor the temperature distribution on the workpiece and adjust gas flow or arc power as needed. A conductivity of at least 10^7 S/m is recommended for optimal welding results.