Ultrasonic inspection of hot thick steel products

Canella, Guido; Monti, F.

doi:10.1016/0308-9126(80)90119-4

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…Ultrasonic velocity in carbon or low alloy steel materials does not change significantly within the ambient temperature range from -35°C to +60°C, although, it does decrease slightly with increase in temperature (2,5) as shown in Figure -1 (4) . For most carbon alloy steels, the temperature co-efficient of ultrasonic velocity is approximately -0.009 percent / °C.…”

Section: Variation In Ultrasonic Velocitymentioning

confidence: 92%

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Ultrasonic study for flaw detectability in ferritic butt welds at high temperatures

Baby¹,

Balasubramanian²,

Pardikar³

2003

Insight - Non-Destructive Testing and Condition Monitoring

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This paper describes the problems encountered during ultrasonic testing of welds at high temperatures, the overall assessment of sound propagation at high temperatures and an innovative technique to circumvent the problems using the conventional probes. In the absence of high temperature transducers an attempt has been made by the authors to examine the welds in the high temperature zone up to 300°C by using contact angle beam probes (less than 4MHz) and scanning from the region (beyond 5 th Vee path) at room temperature. The experimental study involved embedment of natural defects like cracks, incomplete penetration, porosity etc., in the ferritic butt weld (16mm thickness) at predetermined locations. The comparative study was carried out between the responses obtained from the defects at ambient temperature and elevated temperatures. The analysis of the results have shown that the attenuation of ultrasound increases as the temperature at the weld zone increases. It can be seen from the results of the experiments that by making the attenuation corrections at elevated temperatures it is possible to inspect the welds below 300°C without substantial performance loss at test frequencies less than 4MHz.

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Section: Variation In Ultrasonic Velocitymentioning

confidence: 92%

“…Large angles change more rapidly than small angles for a given change in the value of the sine of the angle. Therefore 70° probe change more per unit temperature change than 45° (5,6) . Table -3 (2) shows some typical observed temperature -beam angle relationship.…”

Section: Variation In Beam Anglementioning

confidence: 97%

Ultrasonic study for flaw detectability in ferritic butt welds at high temperatures

Baby¹,

Balasubramanian²,

Pardikar³

2003

Insight - Non-Destructive Testing and Condition Monitoring

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“…A laser-EMAT that is applied in the inspection of steel billet at temperatures in excess of 800 • C thus requires cooling. Ultrasonic inspection of surface and internal defects has the advantages of defect sizing and localization [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Steel billet inspection using laser-EMAT system

Jian

Baillie

Dixon

2007

J. Phys. D: Appl. Phys.

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A pulsed laser to generate ultrasound has been used with an electromagnetic acoustic transducer (EMAT) to successfully detect ultrasonic waves for the fast online inspection of steel billets. Simulations of the ultrasonic signals have been performed by the finite element method to explain the laser-generated ultrasonic field and to compare it favourably with the signals detected by a water-cooled EMAT. With an understanding of the nature of the generated ultrasonic field, the separation between the laser and EMAT can be optimized for internal defect inspection using bulk waves and surface defect inspection, using Rayleigh waves, as the pulsed laser source can generate both these wave modes simultaneously.

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Measurement and Testing in Rolling: Current State and Trends

Williams

1982

Information Symposium Measurement and Control Techniques in Rolling

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Ultrasonic inspection of hot thick steel products

Cited by 7 publications

References 1 publication

Ultrasonic study for flaw detectability in ferritic butt welds at high temperatures

Ultrasonic study for flaw detectability in ferritic butt welds at high temperatures

Steel billet inspection using laser-EMAT system

Measurement and Testing in Rolling: Current State and Trends

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