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Liu, Dashuang; Wei, Ping; Long, Weimin; Zhou, Wei; Wu, Mingfang; Wang, Jiayou
Science and technology of welding and joining, 20/1/2/, Letnik: 26, Številka: 1Journal Article
The effect of ER5356 and ER5087 welding wires on fatigue property of MIG-welded 7N01-T4 aluminium alloy joints was investigated. The microstructure of ER5087 welded joint is similar to that of ER5356 joint. However, the fusion zone of the welding joint with ER5087 has a smaller grain size than that of the joint with ER5356. The fatigue strength of joints welded with ER5356 and ER5087 is 105.9 and 103.2 MPa at 10 7 cycles. During the fatigue process, the crack initiation for joints welded using ER5087 is due to porosity while for ER5356 is due to microcracks from eutectic melting in the heat-affected zone.
