Friction Stir Spot Welding of DP780 Carbon Steel

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1179/136217109X12518083193630· OSTI ID:993770

Santella, Michael L ^[1]; Hovanski, Yuri ^[1]; Frederick, David Alan ^[1]; Grant, Glenn J ^[1]; Dahl, Michael E ^[1]

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1. ORNL

Friction stir spot welds were made in uncoated and galvannealed DP780 sheets using polycrystalline boron nitride stir tools. The tools were plunged at either a single continuous rate or in two segments consisting of a relatively high rate followed by a slower rate of shorter depth. Welding times ranged from 1 to 10 s. Increasing tool rotation speed from 800 to 1600 rev min{sup -1} increased strength values. The 2-segment welding procedures also produced higher strength joints. Average lap shear strengths exceeding 10 {center_dot} 3 kN were consistently obtained in 4 s on both the uncoated and the galvannealed DP780. The likelihood of diffusion and mechanical interlocking contributing to bond formation was supported by metallographic examinations. A cost analysis based on spot welding in automobile assembly showed that for friction stir spot welding to be economically competitive with resistance spot welding the cost of stir tools must approach that of resistance spot welding electrode tips.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 993770
• Journal Information: Science and Technology of Welding and Joining, Vol. 15, Issue 4; ISSN 1362-1718
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUTOMOBILES
BONDING
BORON NITRIDES
CARBON STEELS
DIFFUSION
ELECTRODES
FRICTION
ROTATION
SHEAR PROPERTIES
VELOCITY
WELDED JOINTS
WELDING