Review of the nondestructive evaluation of weldments

Technical Report · Tue Aug 10 04:00:00 EDT 1982

OSTI ID:6936484

Boyd, D M; Shackelford, J F

The nondestructive evaluation (NDE) of weldments has been reviewed from the perspective of LLNL needs. An emphasis is made on the verification of strain history and residual stress predictions of thermomechanical models. Two classes of measurement techniques are identified: on-line welding inspection (of strain history) and postprocessing inspection (of residual stress). In the first category, quantitative NDE has been demonstrated by strain gage and moire techniques. Other methods, such as acoustic emission and ultrasonics, are useful for process control rather than strain history characterization. For postprocessing characterization of residual stress, x-ray diffraction remains as the established, quantitative NDE. Recent progress has been made in speed and equipment portability for such inspections. The most promising alternative to x-ray diffraction is the use of the acoustoelastic effect. This results from rapid progress in ultrasonic measurement technology. However, substantial development work remains due to the sensitivity of ultrasonic velocity to specimen microstructure. The state-of-the-art NDE methods are adequate to treat many welding problems of importance to LLNL. The most productive areas for LLNL research effort in this field include high temperature strain measurement and residual stress measurement by x-ray diffraction and ultrasonics.

• Research Organization: Lawrence Livermore National Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6936484
• Report Number(s): UCID-19417; ON: DE82021947
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
INDUSTRIAL RADIOGRAPHY
INSPECTION
JOINTS
MATERIALS TESTING
MEASURING METHODS
MICROSTRUCTURE
NONDESTRUCTIVE TESTING
RESIDUAL STRESSES
SCATTERING
STRAINS
STRESSES
TEMPERATURE DEPENDENCE
TESTING
ULTRASONIC TESTING
WELDED JOINTS
X-RAY DIFFRACTION