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Ultrasonic testing method

  • US 5,804,730 A
  • Filed: 10/10/1995
  • Issued: 09/08/1998
  • Est. Priority Date: 10/10/1995
  • Status: Expired due to Fees
First Claim
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1. A method of ultrasonically inspecting a selected portion of a metal object having an accessible surface and an opposite surface for flaws using a transducer including an ultrasonic transmitter and receiver where the transducer is moved longitudinally toward and away from said selected portion and laterally essentially parallel to the selected portion, to detect and size flaws in said selected portion and an instrument for recording returned ultrasonic pulse signals received by said receiver where the ultrasonic signals are transmitted in the longitudinal mode within an envelope having a central axis which forms a selected angle with a line perpendicular to a surface of said piece, comprising the steps ofa) determining a reference position on said object in the selected portion on the opposite surface thereof,b) determining a first scanning position on said accessible surface of said object for transmitting an envelope of pulses with the axis thereof directed toward said reference position whereby the points where the envelope of transmitted pulses will intersect said opposite surface on either side of said reference position and define a first longitudinal distance between said points,c) positioning said transducer at said first scanning position and moving said transducer on said accessible surface of said object laterally while transmitting ultrasonic signals into said object with the axis of said envelope directed at said reference position,d) noting on said instrument as indicative of a flaw the first reflected pulse of a reflection of said transmitted signals and noting the location thereof,e) positioning said transducer on said accessible surface so as to detect a first indicated flaw and moving said transducer laterally to size the length of said a first indicated flaw,f) moving said transducer longitudinally on said accessible surface to size the through wall extent of said a first indicated flawg) repeating steps e) and f) for each indicated flaw, andh) recording the position, length and through wall extent of each detected flaw.

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