Reference Part, Especially for Nondestructive Testing by Ultrasonic Vibrations, and a Method for the Fabrication of said Part

Author:  Alain Vieu, Christian Flambard
Source:  US Patent 4,203,315
Doc ID:  1979048
Year of Publication:  1979
Abstract:  
One or a number of inserts are each fitted within a housing formed in a reference part, each insert being preferably of cylindrical and having a predtermined defect in density. An intimate metallurgaical bond is formed between the surface of the insert and the housing by depositing a layer of copper on a steel insert when the part is of steel, and by applying a heat treatement. The reference part serves to calibrate testing instruments for ultrasonic metal inspection as well as to determine the character and size of detected defects in density.