DEVELOPMENT OF A NONDESTRUCTIVE TEST FOR EVALUATION OF ADHESION OF ELECTRODEPOSITS ON STEEL AS IN SILVER-PLATED AIRCRAFT BEARINGS

摘要

This report surveys the nondestructive test methods currently being used for the inspection of silver-plated aircraft bearings. Details of the two principal test methods are given.nThe selection of the test method depends on whether a copper or nickel strike is applied to the bearing shell before silver plating. The shot peening test, wherein the surface of the silver plate is lightly shot peened under controlled conditions is principally used on bearings having a copper strike. The nickel strike bearings are tested by heating the bearing to 950℉, followed by rough boring, or machining to size and then X-raying the bearing surface.nShot peening will produce wrinkles in poorly bonded areas. The heat-ing method produces blisters, which are readily revealed by X-ray examina-tion following machining.