Hybrid fiber laser-arc welding of 10-mm thick Ca6Nm stainless steel

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TypeArticle
Proceedings titleMaterials Science and Technology Conference and Exhibition 2014
ConferenceMS and T 2014 (Materials Science and Technology Conference and Exhibition 2014), Oct. 12-16, 2014, Pittsburgh, PA
ISBN978-163439723-0
Volume3
Pages18911900; # of pages: 10
SubjectCA6NM cast stainless steel; Defects; Hybrid laser-arc welding (HLAW); Mcrostructure; Mechanical properties.; Post-weld heat treatment; Tempering
AbstractSingle pass butt welds were successfully manufactured using a 5.2 kW fiber laser in tandem with arc welding to join 10-mm thick plates of CA6NM, a low carbon martensitic stainless steel in cast form that is widely used for hydroelectric turbines. The joint integrity was evaluated in terms of the weld geometry, discontinuities, microstructure and mechanical properties (tensile and Charpy impact) in both the as-welded and post-weld tempered conditions. Though visible cracks were absent, some defects such as porosity and underfill were observed. The as-welded fusion zone consisted mainly of lath martensite and residual delta ferrite; the latter transformed to tempered lath martensite after post-weld tempering. Four distinct heat affected zones were identifiable through characterization of the microstructure and hardness evolution. Evaluation of the mechanical properties indicated acceptable tensile strength in both the as-welded and post-weld tempered conditions, though the latter was critical for attaining acceptable Charpy impact energy values.
Publication date
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21275946
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Record identifiera0086381-ab8f-4f69-abc3-7cfd430a8ec0
Record created2015-08-12
Record modified2016-05-09
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