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Abstract
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 107 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.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Funding
This work is supported by China Postdoctoral Research Foundation of China (CN ) Science Foundation Funded Project (grant number 2016M601753), Funding of National Natural Science Foundation of China (grant number 51405208), Machinery Science Research Institute Group Co., Ltd Technology Development Fund Project (grant number AZXJJ2031903), Major Projects of Natural Science Research in Colleges and Universities in Jiangsu (grant number 19KJA460009), the International Postdoctoral Exchange Fellowship Program (grant number 20190108), and ‘Blue and Green Project’ of Universities of Jiangsu Province.