Mechanical behavior study of laser-welded joints for DP steel

Qi Yan

doi:10.1117/12.758297

1 February 2008 Mechanical behavior study of laser welded joints for DP steel

Qi Yan

Proceedings Volume 6825, Lasers in Material Processing and Manufacturing III; 68251D (2008) https://doi.org/10.1117/12.758297
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Advanced High Strength Steels (AHSS) are gaining considerable market shares in the automotive industry. The development and application of Dual Phase (DP) steel is just a consistent step towards high-strength steel grades with improved mechanical behavior. Tailor welded blanks with DP steel are promoted in the application of Body-In-White (BIW) structure by the automotive industry. A tailor welded blank consists of several flat sheets that are laser welded together before stamping. Applied cases of tailor welded blanks of high strength steels on the automotive structural parts are investigated in this paper. The mechanical behavior of laser welded joints for DP steel is studied. Microstructure of laser welded joints for DP steel was observed by SEM. Martensite in the weld seam explains the higher strength of welded joints than the base metal. Results show that the strain safety tolerance of laser welded seam for high strength steel can meet the requirement of automobile parts for stamping if the location of laser welded seam is designed reasonably.

Citation Download Citation

Qi Yan "Mechanical behavior study of laser welded joints for DP steel", Proc. SPIE 6825, Lasers in Material Processing and Manufacturing III, 68251D (1 February 2008); https://doi.org/10.1117/12.758297

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