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Proceedings Paper

Fiber laser welding of dual-phase galvanized sheet steel (DP590): traditional analysis and new quality assessment techniques
Author(s): Stephanie Miller; Erik Pfeif; Andrei Kazakov; Esther Baumann; Marla Dowell
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Paper Abstract

Laser welding has many advantages over traditional joining methods, yet remains underutilized. NIST has undertaken an ambitious initiative to improve predictions of weldability, reliability, and performance of laser welds. This study investigates butt welding of galvanized and ungalvanized dual-phase automotive sheet steels (DP 590) using a 10 kW commercial fiber laser system. Parameter development work, hardness profiles, microstructural characterization, and optical profilometry results are presented. Sound welding was accomplished in a laser power range of 2.0 kW to 4.5 kW and travel speed of 2000 mm/min to 5000 mm/min. Vickers hardness ranged from approximately 2 GPa to 4 GPa across the welds, with limited evidence of heat affected zone softening. Decreased hardness across the heat affected zone directly correlated to the appearance of ferrite. A technique was developed to non-destructively evaluate weld quality based on geometrical criteria. Weld face profilometry data were compared between light optical, metallographic sample, and frequency-modulated continuous-wave laser detection and ranging (FMCW LADAR) methods.

Paper Details

Date Published: 18 March 2016
PDF: 12 pages
Proc. SPIE 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V, 97410I (18 March 2016); doi: 10.1117/12.2211186
Show Author Affiliations
Stephanie Miller, National Institute of Standards and Technology (United States)
Erik Pfeif, National Institute of Standards and Technology (United States)
Andrei Kazakov, National Institute of Standards and Technology (United States)
Esther Baumann, National Institute of Standards and Technology (United States)
Marla Dowell, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 9741:
High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V
Friedhelm Dorsch; Stefan Kaierle, Editor(s)

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