Microstructure of Butt Joint of High-Silicon Steel Made Using CO2 Laser Welding and Inconel 82 Filler

A nickel-based filler wire, Inconel 82, was applied to weld a high-silicon steel plate with a chemical composition in wt% of 2.6 Si, 0.5 Al and Fe balance. The chemical composition of the heterogeneous weld bead was deviated from that of the conventional alloy due to incomplete mixing/convection bet...

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Bibliographic Details
Published in:Metals (Basel ) 2023-02, Vol.13 (2), p.234
Main Authors: Chiang, Ming-Feng, Chien, Ping-Hui, Lo, Tzu-Yuan, Shiue, Ren-Kae
Format: Article
Language:English
Subjects:
Aluminum
austenite
Base metal
Butt joints
Carbon dioxide lasers
Chemical composition
Experiments
ferrite
Fillers
Iron
Laser beam welding
laser welding
Lasers
Martensite
Microstructure
Nickel
Nickel base alloys
Power
Silicon
Silicon steels
Steel plates
Superalloys
Weld metal
Weld metal pool
Wire
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Summary:A nickel-based filler wire, Inconel 82, was applied to weld a high-silicon steel plate with a chemical composition in wt% of 2.6 Si, 0.5 Al and Fe balance. The chemical composition of the heterogeneous weld bead was deviated from that of the conventional alloy due to incomplete mixing/convection between the filler wire and base metal in the weld pool. The microstructure of the weld bead was examined in greater depth by FESEM/EBSD, EPMA/WDS and STEM/EDS in the experiment. The heterogeneous weld bead was primarily composed of austenite and martensite, and mainly governed by the Ni concentration. A Schaeffler diagram based on the ratio of Cr and Ni equivalents in the selected positions of the weld bead was used to predict the structure and phase(s) of the Fe-based weld bead. A methodology for the analysis of a weld metal with an unconventional alloy composition has been proposed in the study.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13020234