Friction Stir Lap Welding of Magnesium Alloy to Steel: A Preliminary Investigation
An initial study was made to evaluate the feasibility of joining Magnesium alloy AZ31 sheet to galvanized steel sheet in lap configuration using friction stir welding (FSW). Two different automotive sheet steels were used for comparative evaluation of the dissimilar joining potential; a 0.8mm thick, electro galvanized (EG) mild steel, and a 1.5mm thick hot dipped galvanized (HDG) high-strength, low-alloy steel (HSLA). These steels were joined to 2.33mm thick AZ31B magnesium sheet. A single FSW tool design was used for both dissimilar welds, and process parameters were kept the same. Average peak load for the AZ31-1.5 mm steel weld joint in lap shear mode was found to be 6.3 ± 1.0 kN. For the AZ31-0.8 mm steel weld, joint strength was 5.1 ± 1.5 kN. Microstructural investigation indicates melting of the Zn coating at the interface and subsequent alloying with the Mg sheet resulting in formation of solidified Zn-Mg alloy layer at AZ31/steel interface.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 994025
- Report Number(s):
- PNNL-SA-70692; VT0505000
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 41A(12):3173-3182, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, 41A(12):3173-3182 Journal Issue: 12 Vol. 41; ISSN 1073-5623; ISSN 1543-1940
- Country of Publication:
- United States
- Language:
- English
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