High Frequency Inspection Solution for Austenitic Stainless Steel Welds

Turcotte, J.; Sonatest; Canada

Lachance, F.; Sonatest; Canada
Rioux, P.; Sonatest; Canada
Giguere, D.; Sonatest; Canada
Turcotte, J.; Sonatest; Canada

ID: ECNDT-0123-2018
Download: PDF
Session: Applied PAUT 2
Room: G2
Date: 2018-06-14
Time: 15:40 - 16:00

Austenitic stainless steel is well known for its high mechanical properties and corrosion resistance. This material is used in the oil and gas and nuclear industry, where ultrasonic techniques represent an important proportion of the inspection in the quality control process. However, these alloys often are very attenuating and the sound behaviour of this material is anisotropic. Those characteristics are caused by the grain size and orientation, especially inside the welded volume of a component. Conventional ultrasonic approaches have limited inspection performance, while phased-array with focusing capability and beamforming offers broader coverage and better resolution. This article is going to present a quantitative comparison of the signal quality between some configurations and parameters changes on highly attenuative dissimilar weld samples. Results will show that contrary to popular beliefs; quality of the electronic equipment, focusing capability and inspection configuration, along with probe frequency, can also influence the inspection quality. It will also demonstrate that it is not always required to sacrifice sensitivity and sizing capability over SNR for that kind of inspection.