Microstructure and Properties of Mg/Al Dissimilar Joints by GTAW with Al-Si Filler Wire

Abstract:

Mg/Al dissimilar materials were welded successfully by GTAW with SAlSi welding wire of Al-Si system. The nice surface forming and free defects of joints are formed. Mg/Al welded joint were tested and analyzed by means of optical microscope, scanning electron microscope, microhardness tester. The test results show that in the fusion zone of Mg side, it shows the intense columnar crystalline structure and little intergranular precipitates, and has more dendritic intergranular precipitates. However, the weld zone shows the typical columnar structure zone. There is no high hardness brittle phase in fusion zone of Mg side. The hardness of weld zone is slightly higher than one of Mg substrate, and far less than the Al substrate.

• Periodical: Advanced Materials Research (Volumes 941-944)
• Pages: 2035-2038
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.941-944.2035
• Online since: June 2014
• Authors: Hong Yan Du*, Ya Jiang Li, Juan Wang
• Keywords: GTAW Welding, Mg/Al Dissimilar Materials, Microhardness, Microstructure

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