Understanding effects of welding on strength and formability is critical to support wider application of advanced high strength steels in automotive components. In this study, High Strength Low Alloy (HSLA) and DP980 (Dual Phase, ) sheet steels were welded with a diode laser. Mechanical properties of welds and parent metals were assessed by tensile and limiting dome height tests, and related to microhardness distribution across the welds. The formability of HSLA welds was insensitive to the welding process and comparable to that of parent metal. For the DP steel, weld formability was much lower than that of corresponding parent metal, which appeared to be due to the formation of soft zones in the outer region of the Heat affected zone (HAZ) of the welds. It was found that increase of welding speed resulted in a slight increase of formability of the DP steel, associated with a reduction in the microhardness difference between base metal and HAZ soft zones.
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e-mail: nzhou@uwaterloo.ca
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July 2007
Technical Papers
A Comparative Study of Formability of Diode Laser Welds in DP980 and HSLA Steels
M. Xia,
M. Xia
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada; Central Iron & Steel Research Institute
, Beijing, P. R. China
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N. Sreenivasan,
N. Sreenivasan
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada
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S. Lawson,
S. Lawson
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada
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Y. Zhou,
Y. Zhou
Centre for Advanced Materials Joining,
e-mail: nzhou@uwaterloo.ca
University of Waterloo
, Waterloo, Ontario, Canada
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Z. Tian
Z. Tian
Central Iron & Steel Research Institute
, Beijing, P. R. China
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M. Xia
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada; Central Iron & Steel Research Institute
, Beijing, P. R. China
N. Sreenivasan
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada
S. Lawson
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canada
Y. Zhou
Centre for Advanced Materials Joining,
University of Waterloo
, Waterloo, Ontario, Canadae-mail: nzhou@uwaterloo.ca
Z. Tian
Central Iron & Steel Research Institute
, Beijing, P. R. ChinaJ. Eng. Mater. Technol. Jul 2007, 129(3): 446-452 (7 pages)
Published Online: January 4, 2007
Article history
Received:
June 19, 2006
Revised:
January 4, 2007
Citation
Xia, M., Sreenivasan, N., Lawson, S., Zhou, Y., and Tian, Z. (January 4, 2007). "A Comparative Study of Formability of Diode Laser Welds in DP980 and HSLA Steels." ASME. J. Eng. Mater. Technol. July 2007; 129(3): 446–452. https://doi.org/10.1115/1.2744417
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