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Non-destructive weld inspection during the welding process - possibilities and limitations of an inline monitoring approach

: Schubert, Frank; Bendjus, Beatrice; Cikalova, Ulana; Stephan, Mareike; Hipp, Raffael; Schulze, Eberhard; Barth, Martin; Bor, Zsolt; Heuer, Henning


Proceedings of Meetings on Acoustics 38 (2019), No.1, Art. 032008, 6 pp.
ISSN: 1939-800X
International Congress on Ultrasonics <2019, Brügge>
Journal Article, Conference Paper
Fraunhofer IKTS ()
nondestructive testing techniques; welding; ultrasonic testing; acoustics; Antennas; photometry

Welded joints are usually inspected by ultrasonic non-destructive testing (UT) after completion of the weld. However, such a conventional offline NDT approach is inefficient in case of complex welding techniques, large structural components or expensive materials. If structurally relevant defects are found, a repair is no longer possible and the whole component has to be rejected. For a better identification of defects during the welding process, a temperature-resistant inline monitoring approach is necessary. In the present contribution we describe a multi-method approach based on three different techniques: Phased Array Ultrasonic Testing (PAUT), Acoustic Process Monitoring (AE) and Laser Speckle Photometry (LSP). We present results of inline measurements during Laser-Multi-Pass-Narrow-Gap-Welding of Nickel super alloys and compare the results with posterior ultrasonic immersion testing and metallographic micrographs.