Mechanical properties of dissimilar metal joints composed of DP 980 steel and AA 7075-T6

Squires, Lile; Lim, Yong Chae; Miles, Michael; Feng, Zhili

doi:10.1179/1362171815Y.0000000013

Mechanical properties of dissimilar metal joints composed of DP 980 steel and AA 7075-T6

Journal Article · Wed Mar 18 00:00:00 EDT 2015 · Science and Technology of Welding and Joining

DOI:https://doi.org/10.1179/1362171815Y.0000000013· OSTI ID:1185835

Squires, Lile ^[1]; Lim, Yong Chae ^[2]; Miles, Michael ^[1]; Feng, Zhili ^[2]

Brigham Young Univ., Provo, UT (United States). Manufacturing Engineering Technology
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

In this study, a solid state joining process, called friction bit joining, was used to spot weld aluminium alloy 7075-T6 to dual phase 980 steel. Lap shear failure loads for specimens without adhesive averaged ~10kN, while cross-tension specimens averaged 2·8 kN. Addition of adhesive with a thickness up to 500 μm provided a gain of ~50% to lap shear failure loads, while a much thinner layer of adhesive increased cross-tension failure loads by 20%. Microstructures of the welds were martensitic, but the hardness of the joining bit portion was greater than that of the DP 980, owing to its higher alloy content. Softening in the heat affected zone of a welded joint appeared to be relatively small, though it was enough to cause nugget pullout failures in some lap shear tension specimens. Finally, other failures in lap shear tension were interfacial, while all of the failures in cross-tension were interfacial.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185835

Journal Information:: Science and Technology of Welding and Joining, Journal Name: Science and Technology of Welding and Joining Journal Issue: 3 Vol. 20; ISSN 1362-1718

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Mechanical properties of dissimilar metal joints composed of DP 980 steel and AA 7075-T6

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