Metallurgical Industries, Inc.

Timothy A Wertz

Ira L Friedman

Gilbert A Saltzman

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.

Method of refurbishing cast gas turbine engine components and

A cutting tool is provided with a fabricated cutting edge which is applied using a low heat plasma transferred arc and powdered metal. The heat affected zone between the applied edge and the substrate is maintained at a minimum with low dilution and penetration of the applied material relative to the substrate.

Process of fabricating a cutting edge on a tool and a cutting tool made

The shrouded turbine blade is provided with a wear resistant surface on the seals as well as along the abutment faces including the notched edges. The wear surfaces are characterized in being metallurgically bonded to the base material of the shroud without significant dilution by the base material. This is accomplished by using transparent plasma arc welding at a low amperage and a low temperature. The wear resistant surface can be of a material different from the base material of the shroud proper.

Rebuilt shrouded turbine blade and method of rebuilding the same

The worn tip of a turbine blade is restored by applying a metallurgically bonded wear resistant surface at the tip. The wear resistant surface is applied using a transferred plasma arc and powdered metal particles.

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Manahawkin, NJ, United States of America

Timothy A Wertz