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Laser-GMA-hybrid welding of longitudinally welded large-diameter pipes of grades API-X80/X100 to increase the toughness and the production efficiency

: Rethmeier, Michael; Gumenyuk, Andrey; Gook, Sergej

Postprint urn:nbn:de:0011-n-3667824 (1.9 MByte PDF)
MD5 Fingerprint: ecbd5572f86da615734ec4d7aa98c9bf
Created on: 27.11.2015

Stahl-Institut VDEh, Düsseldorf:
METEC & 2nd ESTAD 2015. Proceedings DVD-ROM : European Steel Technology and Application Days, Düsseldorf, Germany, CCD Congress Center Düsseldorf, 15 - 19 June 2015
Aachen: TEMA Technologie Marketing, 2015
ISBN: 978-3-00-049542-7
11 pp.
European Steel Technology and Application Days (ESTAD) <2, 2015, Düsseldorf>
International Metallurgical Trade Fair with Congresses (METEC) <9, 2015, Düsseldorf>
Bundesministerium für Wirtschaft und Technologie BMWi
IGF; 16415 N; FOSTA
Einsatz des Laserstrahl-MSG-Hybridschweißverfahrens an längsnahtgeschweißten Großrohren der Güte API-X80/ -X100 zur Steigerung der Zähigkeit und Erhöhung der Wirtschaftlichkeit
Conference Paper, Electronic Publication
Fraunhofer IPK ()

The aim of the present work is to investigate the possibilities of the hybrid laser arc welding regarding the reliable and cost effective production of longitudinal welds on the high strength pipeline steels X80 and X120 and to evaluate the achievable mechanical properties of the laser hybrid welds. The study focused on the investigations of the weld seam toughness in the low temperature range (-60 °C and -40 °C). Suitable filler materials have been identified in the context of this task. It could be shown that the metal powder filler wires, micro alloyed with Ni and partly with Cr and Mo, guaranteed sufficient Charpy impact toughness at low temperature for the both investigated materials (average value 190J for X80 at -60 °C and 53 J for X120 at -40 °C). The modern arc technologies such as modified pulsed spray arc have been used to promote the deeper penetration of the filler material in the narrow laser weld. The edge preparation with a root face of 14 mm has been proposed as optimum, because no penetration of the filler material could be detected over this depth limit and therefor any metallurgical influences on the properties of the weld metal through the welding wire are not possible.