Ultrasonic testing method

Details Ultrasonic testing method Ultrasonic testing method

1995-10-10

1998-09-08

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73624, G01N 2906, G01N 2910, G01N 2924

Patent

active

058047301

ABSTRACT:
A single operation, multi-task, non-destructive testing technique of ultrasonic examination for defect detection, analysis and sizing. The technique utilizes the same angle, mode of propagation, calibration, set-up, and scanning patterns, for all materials, thickness of materials, and configuration of components for which it is applicable. The technique is used to detect, analyze and size planar flaws, such as fatigue cracks, which are connected to the surface opposite that from which the ultrasound is propagated. The technique relies on the fact that specular reflections received from flaws that have penetration into materials will return to the transducer before reflections which are associated with geometric features of the surface to which the flaw is connected. It also relies on the properties of the longitudinal mode of sound propagation at a 65-75 degree angle resulting in reduced specular reflections from opposite wall geometric reflectors such as weld roots and counterbores.

REFERENCES:
patent: 3575042 (1971-04-01), Lovelace et al.
patent: 4170145 (1979-10-01), Kennedy et al.
patent: 4294118 (1981-10-01), Shiraiwa et al.
patent: 4570487 (1986-02-01), Gruber
patent: 4730495 (1988-03-01), Green
patent: 4841489 (1989-06-01), Ozaki et al.

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