2017-1(22)

Design, manufacturing and commissioning of nuclear industry equipment

Article NameHybrid Laser Arc Welding of High Grade X80 and X120 Pipeline Steels
AuthorsS. Gook*1, A. Gumenyuk*,**2, M. Rethmeier*,**3
Address

* Fraunhofer Institute for Production Systems and Design Technology IPK, Pascalstraße 8-9, Berlin 10587
1 e-mail: sergej.gook@ipk.fraunhofer.de
ORCID iD: 0000-0002-4350-3850
WoS ResearcherID: F-8636-2017
** Federal Institute for Materials Research and Testing BAM, Unter den Eichen 87, Berlin 12205

2 e-mail: andrey.gumenyuk@bam.de
ORCID iD: 0000-0002-8420-5964
WoS ResearcherID: D-6864-2017;

3 e-mail: michael.rethmeier@bam.de
ORCID iD: 0000-0001-8123-6696
WoS ResearcherID: B-9847-2009

AbstractThe aim of the present work was to investigate the possibilities of hybrid laser arc welding regarding reliable production of longitudinal welds of high strength pipe steels X80 and X120 and to evaluate achievable mechanical properties of laser hybrid welds. The study focused on weld toughness examination in low temperature range up to -60 °C. Suitable filler materials were identified in the context of this task. It could be shown that metal cored electrodes guaranteed sufficient Charpy impact toughness at low temperature for both investigated materials. Modern arc welding technologies such as modified pulsed spray arc were used to promote deeper penetration of the filler material into the narrow laser welding gap. Edge preparation with a 14 mm deep root face was considered as optimum, because no penetration of the filler material could be detected beyond this depth limit and therefore any metallurgical influences on the weld metal properties through the welding wire could be excluded.
Keywordshigh strength steel, hybrid laser arc welding, modified spray arc, longitudinal weld, pipeline
LanguageEnglish
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