Limiting dome height (LDH) tests were used to evaluate the formability of laser butt welded blanks of the dual phase 980 steel in comparison with the base metal. Two different lasers were used: diode and Nd:YAG, giving a wide range of welding thermal cycles. A sharp decrease in LDH was observed in the welded specimens due to the formation of a softened zone in the outer heat affected zone. Softened zone characteristics were correlated with the LDH. Larger softened zones led to a larger reduction in the LDH. The welding orientation relative to the rolling direction or to the punch surface did not influence the formability, as the softened zone dominated the formability behavior. It was observed that in both uniaxial and biaxial strain tests, the fracture occurred in the softened zone of the welded samples consistently slightly farther out from the weld centerline than in the location of the minimum hardness.
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October 2008
Research Papers
Effect of Laser Welding on Formability of DP980 steel
N. Sreenivasan,
N. Sreenivasan
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada
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M. Xia,
M. Xia
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada; Central Iron and Steel Research Institute
, Beijing 100081, P.R.C.
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S. Lawson,
S. Lawson
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada
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Y. Zhou
Y. Zhou
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada
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N. Sreenivasan
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada
M. Xia
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada; Central Iron and Steel Research Institute
, Beijing 100081, P.R.C.
S. Lawson
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, Canada
Y. Zhou
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, ON, N2K 4K8, CanadaJ. Eng. Mater. Technol. Oct 2008, 130(4): 041004 (9 pages)
Published Online: September 9, 2008
Article history
Received:
April 3, 2007
Revised:
October 17, 2007
Published:
September 9, 2008
Citation
Sreenivasan, N., Xia, M., Lawson, S., and Zhou, Y. (September 9, 2008). "Effect of Laser Welding on Formability of DP980 steel." ASME. J. Eng. Mater. Technol. October 2008; 130(4): 041004. https://doi.org/10.1115/1.2969246
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