Technical challenges in narrow-gap root pass welding during tandem and hybrid laser-arc welding of a thick martensitic stainless steel

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DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/MSF.879.1305
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TypeArticle
Journal titleMaterials Science Forum
ISSN1662-9752
Volume879
Pages13051310
AbstractAs part of a collaborative program to develop advanced manufacturing processes for next-generation hydraulic turbines, this study investigated the technological challenges for joining 25-mm thick martensitic stainless steel (MSS) plates using tandem and hybrid laser-arc welding. Although candidate materials for the intended application typically include wrought AISI 415 and cast CA6NM, a martensitic 410 stainless steel (SS) was especially selected in this study due to its greater crack sensitivity. A narrow-gap groove was designed to minimize the amount of 410NiMo filler metal required to fill the groove using a multi-pass single-sided welding technique. All the welding trials were performed using a 5.2 kW fiber laser. The root-pass quality was characterized in terms of weld bead geometry, defects and microstructure. The main technical challenges observed for the root pass were lack of penetration, lack of fusion and cracking, as detailed in this work.
Publication date
LanguageEnglish
AffiliationAutomotive and Surface Transportation; Aerospace; National Research Council Canada
Peer reviewedYes
NPARC number23001161
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Record identifierd9086d6d-afdb-4f17-820e-7b6909dd82f7
Record created2016-12-19
Record modified2016-12-19
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