Fiber laser welding of dual-phase galvanized sheet steel (DP590): traditional analysis and new quality assessment techniques

Stephanie Miller; Erik Pfeif; Andrei Kazakov; Esther Baumann; Marla Dowell

doi:10.1117/12.2211186

18 March 2016 Fiber laser welding of dual-phase galvanized sheet steel (DP590): traditional analysis and new quality assessment techniques

Stephanie Miller, Erik Pfeif, Andrei Kazakov, Esther Baumann, Marla Dowell

Author Affiliations +

Proceedings Volume 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V; 97410I (2016) https://doi.org/10.1117/12.2211186
Event: SPIE LASE, 2016, San Francisco, California, United States

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.

Citation Download Citation

Stephanie Miller, Erik Pfeif, Andrei Kazakov, Esther Baumann, and Marla Dowell "Fiber laser welding of dual-phase galvanized sheet steel (DP590): traditional analysis and new quality assessment techniques", Proc. SPIE 9741, High-Power Laser Materials Processing: Lasers, Beam Delivery, Diagnostics, and Applications V, 97410I (18 March 2016); https://doi.org/10.1117/12.2211186

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