Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 15, Issue 4, Pages 271-278Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/136217109X12518083193630
Keywords
Friction stir; Spot weld; Carbon steel; Automotive; Joint strength; Bonding
Funding
- US Department of Energy, Assistant Secretary for Energy Efficiency and Renewable Energy, Office of FreedomCAR
- Vehicle Technologies, with UT-Battelle, LLC [DE-AC05-00OR22725]
Ask authors/readers for more resources
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(-1) increased strength values. The 2-segment welding procedures also produced higher strength joints. Average lap shear strengths exceeding 10.3 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available