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XU Zhiwu, LI Zhengwei, FENG Yan, YAN Jiuchun. Microstructure and mechanical properties of Mg/Al friction stir lap welding joint assisted by stationary shoulder[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 1-6. DOI: 10.12073/j.hjxb.20170401
Citation: XU Zhiwu, LI Zhengwei, FENG Yan, YAN Jiuchun. Microstructure and mechanical properties of Mg/Al friction stir lap welding joint assisted by stationary shoulder[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2017, 38(4): 1-6. DOI: 10.12073/j.hjxb.20170401

Microstructure and mechanical properties of Mg/Al friction stir lap welding joint assisted by stationary shoulder

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  • Received Date: October 28, 2016
  • In this work, stationary shoulder was used in friction stir lap welding (FSLW) of dissimilar magnesium alloy to aluminum alloy. Effect of the welding speed on microstructure and mechanical properties of the lap joint were mainly studied. Results show that the stationary shoulder can enhance the material mixing between the two alloys. The stir zone (SZ) is characterized by a big onion ring after welding, in which plenty of intermetallic compounds (IMC) can be obtained. Excellent metallurgical bonding can be observed at the lap interface. Microhardness of the onion ring is higher than other regions of the joint due to the IMC. X-ray diffraction (XRD) pattern analysis shows that the main IMCs formed in the SZ are Al3Mg2 and Al12Mg17. Lap shear failure load of the joint firstly increases and then decreases with increasing the welding speed. The maximum load is obtained when using 40 mm/min.
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