On Laser Welding of Thin Steel Sheets
This paper presents a process-structure-property relationship study of laser welds as a continuous consolidation method for joining thin monophased steel foils, thereby providing a more effective, less costly method to construct automotive catalytic converters. A body centred cubic (bcc) iron-chromium-aluminium alloy doped with Mischmetal was utilised in this study. Both pulsed and continuous wave modes were used to establish the limit welding diagrams for lap joint configuration. Actual laser welding parameters were selected using several testing conditions. The laser welds behaved substantially different from the base material under creep and high temperature oxidation. The difference was mainly attributed to the changes in grain morphology, precipitation of aluminium nitrides and carbides, and relocalisation of the reactive elements during liquid metal flow upon keyhole formation, solidification and cooling.
E. M. El-Giar et al., "On Laser Welding of Thin Steel Sheets," Science and Technology of Welding and Joining, vol. 17, no. 7, pp. 571-580, Maney Publishing, Jun 2012.
The definitive version is available at http://dx.doi.org/10.1179/1362171812Y.0000000050
Materials Science and Engineering
Keywords and Phrases
Automotive catalytic converters; Base material; Body-centred cubic; Consolidation methods; Continuous wave modes; Grain morphologies; Lap joint; Laser welding parameters; Laser welds; Liquid metal flows; Misch metal; Monophased; Process-structure-property relationship; Reactive elements; Steel foils; Tensile; Testing conditions; Aluminum; Aluminum nitride; Carbides; Catalytic converters; Chromium; Creep; Liquid metals; Nitrides; Scanning electron microscopy; Steel; Thermooxidation; Welds; Laser beam welding; High temperature oxidation; SEM
International Standard Serial Number (ISSN)
Article - Journal
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