Nondestructive evaluation of electron-beam braze joins
A nondestructive evaluation (NDE) program has been carried out using holographic interferometry, microradiography, and eddy current testing for the inspection of electron beam braze joining of dissimilar metals. Stainless steel tubing was joined to a gold-copper disk using a Cusil (copper/silver) brazing alloy. Holographic interferometry provided an indirect measure of strength by detecting the plastic deformation occurring as a result of applying a stress. Microradiography with the aid of computer graphics displays provided a means of measuring braze penetration into the stainless steel tube. Correlation of results with metallographic examination and microhardness measurements show that holography and microradiography each provide quantitative braze quality rankings. Each method correctly identified variations in braze quality independent of electron beam power (the only processing variable in sample fabrication). Eddy current results were consistent with the other NDE methods but appear to be based on variation in surface topography rather than electrical conductivity. The usefulness of the eddy current method for this problem is questionable due to its sensitivity to the small, complex test piece geometry.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5709524
- Report Number(s):
- UCRL-53185; ON: DE82005846
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALLOYS
BRAZED JOINTS
BRAZING ALLOYS
CHROMIUM ALLOYS
CONTROL
CORROSION RESISTANT ALLOYS
EDDY CURRENT TESTING
ELECTROMAGNETIC TESTING
ELECTRON BEAM MELTING
HOLOGRAPHY
INDUSTRIAL RADIOGRAPHY
INTERFEROMETRY
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS TESTING
MELTING
MICRORADIOGRAPHY
NONDESTRUCTIVE TESTING
PHASE TRANSFORMATIONS
QUALITY CONTROL
STAINLESS STEELS
STEELS
TESTING
TUBES
WELDED JOINTS
360101 -- Metals & Alloys-- Preparation & Fabrication
42 ENGINEERING
420500* -- Engineering-- Materials Testing
ALLOYS
BRAZED JOINTS
BRAZING ALLOYS
CHROMIUM ALLOYS
CONTROL
CORROSION RESISTANT ALLOYS
EDDY CURRENT TESTING
ELECTROMAGNETIC TESTING
ELECTRON BEAM MELTING
HOLOGRAPHY
INDUSTRIAL RADIOGRAPHY
INTERFEROMETRY
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS TESTING
MELTING
MICRORADIOGRAPHY
NONDESTRUCTIVE TESTING
PHASE TRANSFORMATIONS
QUALITY CONTROL
STAINLESS STEELS
STEELS
TESTING
TUBES
WELDED JOINTS