In-line inspection of friction stir welds using laser ultrasonic testing
- Klein M. ,
- Osikowicz W. ,
- Fremling J. ,
- et al
- Klein M. ,
- Osikowicz W. ,
- Fremling J. ,
- Lindh-Ulmgren E. ,
- Engman M. and
- Falkenstrom M.
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With regard to the application of friction stir welding (FSW) for the butt weld joining of aluminium alloy extrusions into large panels for ship decks and railway carriages, an investigation is presented into the employment of laser ultrasonic testing (LUT) as a viable technique for in-line inspection of FSW joints. The LUT method involved a pulsed laser beam directed via an optical fibre to the weldment surface and the production of laser generated ultrasonic waves in the ablation regime. The data were organised into a standard ultrasonic B-scan, in which the horizontal axis was time-of-flight for the ultrasonic pulse and the vertical axis was detection position scanned along the welded joint. Trial results for a partially welded aluminium panel with elongated voids are reported. In-line signal processing algorithms for data analysis without operator intervention are discussed.
12th International Symposium, 26-28 Jun 2018, Session 5A: Quality, Paper 03
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