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Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.44 - p.51

Ultrasonic Guided Wave Approach for Inspecting Concave Surface of the Laser Butt-welded Pipe

Akinori FURUSAWA1,*, Akihiko NISHIMURA1,† Toshihiko TAKEBE2, Masaki NAKAMURA3, Yusuke TAKENAKA4, Shingo SAIJO5, Hiroyuki NAKAMOTO6

1 Applied Laser Technology Institute, Japan Atomic Energy Agency, 65-20, Kizaki, Tsuruga-shi, Fukui, 914-8585, Japan
2 SUGINO MACHINE LTD., 2410 Hongo, Uozu City, Toyama, 937-8511, Japan
3 Laserx Co., Ltd., 7, Kofukada, Shin-Bayashi-tyo, Chiryu-shi, Aichi, 472-0017, Japan
4A-tech Co., Ltd., 2-11-7,Funaishikawaeki-nishi, Tokai-mura, Naka-gun, Ibaraki, 319-1116, Japan
5Sanritz Automation Co., Ltd., 4-21-6, Minaminaruse, Machida-shi, Tokyo, 194-0045, Japan
6Graduate School of System Informatics, Kobe Univ.,1-1 Rokkodai-tyo, Nada-ku, Kobe-shi, Hyogo, 657-8501, Japan

The aim of this work presented here is to investigate the applicability of ultrasonic guided wave for evaluation of laser beam butt-welding quality. First, ten in total test pipes having welding seam are prepared. Two piece of pipe are jointed and continuous laser beam is irradiated on the edges, varying laser irradiation power, welding side and surface profile of the adjacent edges of the pipe. Second, ultrasonic guided wave testing experiment is performed on the pipes. Torsional mode guided wave is excited by Electromagnetic Acoustic Transducers. Finally, the experimental results are analyzed and issues are discussed. The reflection wave bullet from the poor interface of the welding seam is clearly observed, whereas no reflection from fine welded line. From the aspect of laser irradiation power, welding side and surface profile of the adjacent edges, the relation between the interface condition and detection wave bullet are analyzed. It is found that the ultrasonic guided wave technologies have the potential for evaluating laser beam butt-welding seam.
Structural health monitoring, Laser processing, Laser cladding, Hybrid optical fiber scope, Electromagnetic Acoustic Transducer, EMAT, Nondestructive testing
Full Paper: PDF
Article Information
Article history:
Received 12 October 2016
Accepted 29 May 2017