Ultrasonic Spot Welding of AZ31B to Galvanized Mild Steel

Conference · Thu Dec 31 23:00:00 EST 2009

OSTI ID:981782

Pan, Dr. Tsung-Yu ^[1]; Franklin, Teresa ^[2]; Pan, Professor Jwo ^[2]; Brown, Elliot ^[3]; Santella, Michael L ^[4]

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1. Ford Motor Company
2. University of Michigan
3. EB Scientific
4. ORNL

Ultrasonic spot welds were made between sheets of 0.8-mm-thick hot-dip-galvanized mild steel and 1.6-mm-thick AZ31B-H24. Lap-shear strengths of 3.0-4.2 kN were achieved with weld times of 0.3-1.2 s. Failure to achieve strong bonding of joints where the Zn coating was removed from the steel surface indicate that Zn is essential to the bonding mechanism. Microstructure characterization and microchemical analysis indicated temperatures at the AZ31-steel interfaces reached at least 344 C in less than 0.3 s. The elevated temperature conditions promoted annealing of the AZ31-H24 metal and chemical reactions between it and the Zn coating.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 981782
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
BONDING
CHEMICAL REACTIONS
COATINGS
MICROSTRUCTURE
STEELS
ULTRASONIC WAVES
WELDED JOINTS
WELDING