Method and device for coating turbine components

摘要

A method and portable device for modifying or coating a surface of turbine components in the field includes an ESD torch electrically connected with ESD equipment. The ESD torch includes an inert gas source, vibration source, and electrode disk of conductive material. The electrode disk is disposed within the ESD torch, shielded by an inert gas and coupled with the vibration source. The electrode disk is rolled over the surface, which actuates the electrode disk and deposits the conductive material from the electrode disk onto the surface of the workpiece to form the compositionally controlled protective coating. The compositionally controlled protective coating deposited by the electrode disk forms a metallurgical bond with the surface of the workpiece to prevent erosion of the workpiece.

主权项

1. A method for modifying a workpiece comprising:
providing the workpiece having a first surface; preparing the first surface of the workpiece; providing a portable coating device including:
electro-spark deposition (ESD) equipment, andan ESD torch electrically connected with the ESD equipment, the ESD torch including:
an inert gas source;a housing, the housing being arranged and disposed to contain and support an electrode disk holder therein, and position a torch cup removably attached to the housing;an electrode disk including a conductive material, the electrode disk disposed within the electrode disk holder and removably attached to the electrode disk holder by a pin, the electrode disk shielded by an inert gas; anda vibration source operably coupled with the electrode disk holder, the vibration source being arranged and disposed to linearly vibrate the electrode disk holder independent of the housing, the linear vibration of the electrode disk holder extending the electrode disk from and retracting the electrode disk within the torch cup to create an air gap between the electrode disk and the workpiece; and rolling the electrode disk of the ESD torch over the first surface, the rolling comprising creating an air gap between the electrode disk and the workpiece by vibrating the electrode holder within the housing, the vibration source providing the vibrating of the electrode holder; wherein rolling deposits the conductive material from the electrode disk onto the first surface to form a compositionally controlled protective coating over the first surface of the workpiece; and wherein the compositionally controlled protective coating forms a metallurgical bond with the first surface of the workpiece.