Progress realized in the automatic control by ultrasonics of austenitic stainless steel welds using focalized transducers

Technical Report · Fri Jun 01 04:00:00 EDT 1973

OSTI ID:4938523

Saglio, R; Roule, M

The ultrasonic control of austenitic stainless steel welds is almost impossible with classical transducers because of the reflections at the grain boundary which gives a signal-to-noise ratio that is too weak. The use of focalizing transducers makes it possible, on one hand, to improve the signal-to- noise ratio by a value which can reach 40 db and, on the other hand, because of the fineness of the ultrasonic beam obtained, to dimension the faults with a precision sharply superior to that obtainable with a plane transducer. Examples of the industrial realization of automatic devices using focalizing transducers for control of angle welds, T welds, and streak welds on small tubes are presented. A new method is available for the ultrasonic control in the case of very absorbant materials or materials having a strong reflectivity at the grain boundaries. The dimensioning of faults becomes more reliable and more precise. (tr-auth)

• Research Organization: CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Technologie
• Sponsoring Organization: Sponsor not identified
• NSA Number: NSA-29-024706
• OSTI ID: 4938523
• Report Number(s): CEA-CONF--2449; CONF-730606--8
• Country of Publication: France
• Language: French

Related Subjects

AUSTENITE
BEAM OPTICS
CONTROL
DEFECTS
FOCUSING
N42400 --Engineering--Materials Testing
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
NOISE
SEAM WELDS
SIGNALS
STAINLESS STEELS
TRANSDUCERS
TUBES
ULTRASONIC TESTING
WELDED JOINTS