The paper summarises results of measurements of remelting area geometry,
thermal efficiency and melting efficiency
characterising the surface remelting process applied to castings of MAR-M-509
cobalt alloy. The remelting process was
carried out with the use of GTAW (Gas Tungsten Arc Welding) method in
protective atmosphere of helium, at the electric
current intensity in the range from 100 A to 300 A, and the electric arc
scanning velocity vs in the range from 200 mm/min to
800 mm/min. The effect of current intensity and electric arc scanning velocity
on geometrical parameters of remeltings,
thermal efficiency, and melting efficiency characterising the remelting
process has been determined.