Nondestructive Testing and Inline Monitoring of Laser Beam Narrow-Gap Weldings of Thick Metal Sheets

Speaker:
Schubert, Frank; Fraunhofer IKTS; Germany

Authors:
Schubert, F.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Bendjus, B.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Cikalova, U.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Stephan, M.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Hipp, R.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Schulze, E.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Barth, M.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany
Bor, Z.; Fraunhofer Institute for Ceramic Technologies and Systems IKTS; Germany

ID: ECNDT-0536-2018
Download: PDF
Session: In-process monitoring for Additive Manufacturing
Room: H1
Date: 2018-06-13
Time: 13:30 - 13:50

Welded structures based on thick metal sheets are usually produced by conventional welding technologies but to an increasing degree also by laser multi-pass narrow gap welding. With the latter technique metallic components with a large wall thickness of up to 100 mm can be efficiently welded. Due to economic reasons a conventional NDT approach based on ultrasonic testing of completely welded components after the welding process is inefficient. 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 but not yet available. In the present article we describe a multi-method approach based on three different techniques: Phased Array Ultrasonic Testing, Acoustic Emission Testing and Laser Speckle Photometry. We present intermediate results of inline measurements and comparisons with conventional NDT using ultrasonic immersion testing.