Attenuation in ultrasonic inspection

Attenuation in ultrasonic inspection

THURSTON, R.N. and SHAPIRO, M. J. Interpretation of uWaaonic experiments on finite amplitnde waves. Journal of the Acoustical Society of America, 41, ...

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THURSTON, R.N. and SHAPIRO, M. J. Interpretation of uWaaonic experiments on finite amplitnde waves. Journal of the Acoustical Society of America, 41, No. 4, Part 2, p. 1112 (1967) An analysis performed to relate high-order elastic constants to the growth of harmonics in an initially sinusoidal wave is presented. The equation of one-dimensional motion is explored in the form of a series expansion and some relationships between the expansion coefficients are established. (20 references) (Ultrasonics 1967, abstract 710)

Ultrasonic inspection procedure requirements for full penetralhg lm& welds. Testing, Instruments and Controls, 4, No. 2, p. 25 (1967) The materials and instruments needed are detailed for a pulse echo technique for testing butt welds. Calibration and preparation are described, and the procedure outlined for inspection by shear-wave scanning with the sound wave beam towards, across or along the weld axis. (2 figs) (Ultrasonics 1967, abstract 716)

YING, S. Single narrow

beam ultrasonic transducer with conical and wedge shaped collimators. IEEE transactions on sonics and ultrasonics, SU-14, No. 2, p. 67 (1967) The transducer type indicated in the title was investigated experimentally at a frequency of 2MHz. It was found that, for the optimum combination of collimator parameters, the beamwidth of the main lobe of the radiation pattern was 6” at -3dB. Minor lobes were suppressed to 40dB below axial response. An account is given of factors governing the design of such devices. (3 figs, 1 table, 3 references) (Ultrasonics 1967, abstract 711)

Another ultrasonic drilling developmentat Harwell. Industrial Diamond Review, 27, No. 318, p. 195 (1967) A new version of the ultrasonic drilling machine, reported in July 1966 in Industrial Diamond Review, has been produced at the UHAB Research establishment at Harwell. The machine can operate vertically or horizontally and uses diamond-impregnated probes. It is used to machine glass and ceramic work-pieces. (8 figs) (Ultrasonics 1967, abstract 712)

Attenuation in ultrasonic inspection. Testing, Instruments and Controls, 4, No. 5, p. 25 (1967) The method of quality testing in ferrous and non-ferrous alloys is outlined. It is based on the phenomenon of attenuation of an ultrasonic beam when scattering losses occur with large gram structure in the materials concerned. (Ultrasonics 1967, abstract 713)

Silent sounds whisper warnings. Iron Age, 200, No. 5, p. 58 (1967) The use of an ultrasonic detector to trace splits in boilers and condenser tubes and check hydrogen systems is described. The structure of the detector and the detection techniques are outlined. Ultrasonic energy is present when gas escapes from a leak, and it is this energy which is found by the method now reported, even when no other tangible signs of leakage exist. (Ultrasonics 1967, abstract 714)

Tube drawing via uItrasonics. Iron Age, 200, No. 1, p. 65 (1967) A review of the facts emerging from experience in the use of ultrasound in tube drawing is presented. The reason for the reduction of drawing forces, giving a smoother finish with faster drawing speeds and greater area reduction, is thought to be the substantial reduction in interfacial friction between the tool and the metal drawn. A short discussion is given of the commercial advantages. (Ultrasonics 1967, abstract 715) 276

ULTRASONICS October 1967

Ultrasonic machine tool. Tooling, 21, No. 6, p. 49 (1967) A new machine has been developed over the past five years for the machining of hard and brittle materials. The machine has diamond-impregnated or electro-deposited tools which reciprocate axially at ultrasonic frequencies. The ultrasonic generator operates at 2OkHz and the piezoelectric transducer gives an excursion of less than 0.001 inch. The machine can perform drilling, thread-cutting, grinding, slotting and similar operations. (3 figs) (Ultrasonics 1967, abstract 717)

Ultrasonic thickness measurement. Testing, Instruments and Controls, 4, No. 3, p. 21 (1967) An ultrasonic resonance instrument is reported for determining wall thickness in pressure vessels. The theory of the device is outlined and limitations of the method are stressed, especially with heavily corroded surfaces where clearly defined resonant frequencies are hard to obtain, so that pulse echo techniques should be employed in preference. (2 tables) (Ultrasonics 1967, abstract 718)

Ultrasonics assures structural integrity of first clearspan toll road restaurant. Welding International, July 1967, p. 39 The 32 butt welds supporting the Illinois State Toll Highway Commission’s first clear-span restaurant building have been tested by ultrasonics. The building processes are described and the need for testing stressed. Longitudinal-and shearwave ultrasonic probes were used. In this way many cracks and faults were detected and put right during the erection of the building. The probes were calibrated against reference blocks, matched to the weld metal to be tested. (9 figs) (Ultrasonics 1967, abstract 719)

Ultrasonics make big impact on tube drawing. Metalworking Production, 111, No. 32, p. 50 (1967) Ultrasonic tube drawing, involving application of highfrequency energy at about 15000Hz, to a fixed mandrel, can increase tube production by 35%. The technioue ensures a longer tool life because of cuts in friction and reduction of the draw force by 5-10%. The system has the advantage that it can be applied to existing equipment. The techniqie is said to produce a better surface finish than conventional methods. (2 figs) (Ultrasonics 1967, abstract 720)