In Situ and Post-Mortem Characterizations of Ultrasonic Spot Welded AZ31B and Coated Dual Phase 590 Steel Joints

Chen, Jian; Lim, Yong Chae; Leonard, Donovan; Huang, Hui; Feng, Zhili; Sun, Xin

doi:10.3390/met10070899

In Situ and Post-Mortem Characterizations of Ultrasonic Spot Welded AZ31B and Coated Dual Phase 590 Steel Joints

Journal Article · Mon Jul 06 00:00:00 EDT 2020 · Metals

DOI:https://doi.org/10.3390/met10070899· OSTI ID:1649203

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

Ultrasonic spot welding using different welding conditions was applied to join dissimilar metals of galvanized DP590 steel and AZ31B magnesium sheets. In situ high-speed imaging, digital image correlation, and infrared thermography were utilized to quantitatively study the interfacial relative motion, surface indentation, and heat generation across the joint faying interface and the sheet/sonotrode interfaces under the welding condition of moderate welding power and short welding time. For welds made with high power and long welding time, lap shear tensile tests as well as fatigue tests were carried out. Different fracture modes were observed after the lap shear tensile tests and fatigue tests performed under different peak loads. Post-weld cross-sectional analysis with scanning electron microscopy coupled with energy dispersive X-Ray spectroscopy revealed the variation of morphology and chemical composition at the joint interface for welds made with different welding conditions.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1649203

Journal Information:: Metals, Journal Name: Metals Journal Issue: 7 Vol. 10; ISSN 2075-4701

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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