Method of removing surface defects of a steel product
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsWataru Shimada, Seigo Hiramoto
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Abstract
A method of removing surface defects from the surface of a steel product, such as a slab designed for rolling, wherein the defects are melted by an arc generated by an arc welding apparatus having a non-consumable electrode, a guide nozzle about the electrode to maintain an inert gas atmosphere immediately thereabout, and a shield nozzle about the guide nozzle to inject a mainly carbon dioxide gas therefrom, and a deoxidizer is applied to the molten pool formed in the welding operation so as to cover the surface thereof with a slag formed by the deoxidizer which is oxidized.
Claims4
In a method of removing surface defects of a steel product by melting the defects of the surface with an arc, the improvement characterized by
- using an arc generator which comprises a non-consumable electrode protected with an inert gas and means for shielding a molten pool formed on the surface of the steel product from air with a shield gas, comprising mainly carbon dioxide gas, and
- applying a deoxidizer to the molten pool to deoxidize it and cover the surface of the molten pool with a slag formed therewith by the deoxidizer which is oxidized.
Dependencies are inferred from the claim text.