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Quality-Control of Laser Welds of Tailored Blanks Using Guided Waves and EMATs

: Salzburger, H.-J.; Dobmann, G.; Mohrbacher, H.

Brusey, B.; Bussiere, J.F.; Dubois, M.; Moreau, A. ; Canadian Institute of Mining, Metallurgy and Petroleum:
Advanced Sensors for Metals Processing
Quebec: Met Soc, 1999
ISBN: 0-919086-92-6
Annual Conference of Metallurgists of CIM - Gateway to the 21th Century <38, 1999, Quebec>
Fraunhofer IZFP ()
laser weld; Laserscheißnaht; quality control; quality inspection; Tailored Blank

In modern design of automobile bodies reduction in weight and maximilization of the structural stiffnes and passive safety are the main challenge. For an essential reduction in weight the "Tailored Blank" has contributed. The single flat sheets are joined by Laser Welding (butt weld). usually the quality of the welds is assured by precise preparation of the plate edges as well by couple of process parameters. However due to the deviations typical defects occur, which make NDT necessary to detect defects as incomplete welding, lack of fusion, misalignment of the weld, holes and porosity. Conventional UT is ruled out because of the necessary liquid coupling medium. Dry UT by EMAT's can solve this task.