Charge and heat transfer from arc plasma to metal particle in GMA welding or PTA surfacing
Atmospheric pressure argon arc plasma with metal spherical particle is studied numerically. The particles of the radius of 10-5 – 10-4 m and 10-3 m are considered. That corresponds to particles of additive material in plasma transferred arc (PTA) surfacing and droplets of electrode metal in gas metal arc (GMA) welding, respectively. The plasma is described in a hydrodynamic approach with account for its thermal and ionization non-equilibrium near the particle. The electric current flowing through the particle and the heat flux transferred to the particle in the arc plasma are found.
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