Development and application of specially-focused ultrasonic transducers to location and sizing of defects in 75 mm- to 127 mm-thick austenitic stainless steel weld metals

Conference · Sat Aug 01 00:00:00 EDT 1992

OSTI ID:10167912

Dalder, E N.C.; Benson, S; McKinley, B J; Carodiskey, T

Special UT transducer parts, capable of focusing incident signals within a 25 mm {times} 25 mm {times} 25 mm volume in an austenitic stainless weld metal at depths that varied from 25 mm to 127 mm, were developed and demonstrated to be capable of detecting a defect with cross section equivalent to that of a 4.76 mm-dia flat-bottom hole. Defect length sizing could be accomplished to {plus_minus}50% for 100% of the time and to {plus_minus}25% on selected defect types as follows: porosity groups, 100%; cracks, 67%; combined slag and porosity, 60%; and linear slag indications, 59%. Extensive linear elastic-fracture-mechanics analyses were performed to establish allowable defect sizes at functions of stress, based on a cyclic-life criterion of 10{sup 3} full power cycles of the MFTF-B magnet system. These defect sizes were used to determine which UT indicating were to be removed and repaired and which were to be retained and their recorded sizes and locations.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10167912
• Report Number(s): UCRL-JC-111577; CONF-9211134-2; ON: DE93015975
• Resource Relation: Conference: 2. symposium on cyclic deformation, fracture, and nondestructive evaluation of advanced materials,Miami, FL (United States),16-17 Nov 1992; Other Information: PBD: Aug 1992
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DEFECTS
DETECTION
ULTRASONIC TESTING
STAINLESS STEELS
WELDED JOINTS
MFTF DEVICES
SUPERCONDUCTING MAGNETS
TRANSDUCERS
INSPECTION
FRACTURE MECHANICS
420500
700480
665412
MATERIALS TESTING
COMPONENT DEVELOPMENT
MATERIALS STUDIES
SUPERCONDUCTING DEVICES