초록 ▼

The refurbishing process permits an overlay to be formed on a casting to repair cracks, distortions and the like as well as to build up undersized sections. During refurbishing, a plasma arc is established under an electric current of less than 30 amps to form a shallow pool of molten metal on a cas

The refurbishing process permits an overlay to be formed on a casting to repair cracks, distortions and the like as well as to build up undersized sections. During refurbishing, a plasma arc is established under an electric current of less than 30 amps to form a shallow pool of molten metal on a casting. Powdered metal is delivered slightly above the molten pool and, subsequently, the melted powder and molten pool solidify to an overlay having a high integrity, cast structure which is metallurgically bonded to the casting with minimal dilution.

대표청구항 ▼

A process of refurbishing a superalloy casting comprising the steps of generating a plasma arc between an electrode and a section of the casting to be refurbished under an electric current of less than 30 amps to melt a surface of said section into a shallow pool of molten metal without detrimentall

A process of refurbishing a superalloy casting comprising the steps of generating a plasma arc between an electrode and a section of the casting to be refurbished under an electric current of less than 30 amps to melt a surface of said section into a shallow pool of molten metal without detrimentally heating the casting; delivering a controlled amount of welding powder of the same composition as the superalloy casting into said arc at a point slightly above said molten pool for heating and delivery to said molten pool; and subsequently solidifying the delivered powder and molten pool into an overlay, having a high integrity cast structure metallurgically bonded to said casting and being of the same composition as the casting.