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TECHNICAL PAPERS

The Effects of Post-Weld Cold Working Processes on the Fatigue Strength of Low Carbon Steel Resistance Spot Welds

[+] Author and Article Information
R. Spitsen

 The Boeing Co., Everett, WA 98204

D. Kim

School of Engineering and Computer Science,  Washington State University, Vancouver, WA 98686

B. Flinn

Department of Materials Science and Engineering, University of Washington, Seattle, WA 98195-2120

M. Ramulu

Department of Mechanical Engineering, University of Washington, Seattle, WA 98195

E. T. Easterbrook

 StressWave Inc., Kent, WA 98032

J. Manuf. Sci. Eng 127(4), 718-723 (Jan 28, 2005) (6 pages) doi:10.1115/1.2034514 History: Received August 27, 2004; Revised January 28, 2005

The investigation on the use of a post-weld cold working process to improve fatigue strength of low carbon steel resistance spot welds is presented. The cold working process generates uniform and consistent large zones of compressive residual stresses in resistance spot-welded low carbon steel structures using a specially designed indentation device. The effect of the indentation process parameters on the mechanical properties of the resistance spot weld was investigated. Comparisons of the mechanical properties and qualitative results between the as-resistance spot-welded specimens and the post-weld cold worked resistance spot-welded specimens have been made in this investigation. Fatigue testing was also conducted to evaluate the effect of post-weld cold working process on the fatigue characteristics of resistance spot welds. Results showed that a significant improvement in the fatigue strength has been achieved through the post-weld cold working process.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of tested specimens

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Figure 2

Schematic diagrams of the post-weld cold working process and the indenter geometry

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Figure 3

Effect of indentation size on material microhardness (ND: 3.2mm)

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Figure 4

Effect of indentation pressure on material microhardness (ND: 3.2mm)

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Figure 5

Microstructure of as-welded and post-weld cold worked samples

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Figure 6

Typical load vs. displacement curve for as-welded and post-weld cold worked specimens (tensile testing condition: strain rate 2.54mm∕min)

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Figure 7

Main effects on maximum load (dotted line indicates the average maximum load of as-welded specimens)

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Figure 8

L-N curve for 1008 spot welded specimens (R Ratio: 0.1, 25Hz, post-weld cold worked specimens IP: 1000MPa, IS: 4.6mm)

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