Disclosed are a method for improving a surface quality of an alloy micro-area via a supersaturated film and use thereof. The method includes: adding nickel chloride to a sodium chloride-ethylene glycol electrolyte until the electrolyte is saturated, and conducting electrochemical machining.

A tool electrode for an EDM system for repairing a micromixer tube of a combustor, the EDM system and a related method, are provided. The tool electrode includes an elongated member; and a disk having a first side, a second side, an opening in a center thereof, and a slot extending from the first side to the second side and from the opening to an outer periphery of the disk. The elongated member is coupled to the disk and extends through the opening from the first side of the disk and beyond the second side of the disk. The disk is used to remove a damaged end portion of a micromixer tube from within the tube, and without debris damaging the tube or a cutting tool damaging other tubes in a set of micromixer tubes.

An electrical discharge machining (EDM) fixture for machining a part includes a support structure fixable onto a work surface, a base plate fixed to the support structure, a toggle clamp positioned on one side of the base plate, and a secondary clamp positioned on an opposite side of the base plate. A plurality of contact points are respectively associated with the toggle clamp and the secondary clamp, and a tool ball is fixed to the base plate.