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The plates with 20mm thickness of 7A52 aluminum alloy were welded by electron beam welding and TANDEM welding with ER5356 filler,respectively.The microstructure and mechanical properties of the joints were investigated.The results showed that the microstructure of EBW metal was finer and tighter than TANDEM welding.The heat-affected zone of the EBW joint was narrower,its hardness was higher and the tensile strength improved obviously compared to TANDEM welding.Excellent quality control of the EBW joint was made without abnormal porosity,inclusions and micro-cracks.Therefore,the EBW joint of 7A52 aluminum alloy showed excellent performance.
The plates with 20mm thickness of 7A52 aluminum alloy were welded by electron beam welding and TANDEM welding with ER5356 filler, respectively. Microstructure and mechanical properties of the joints were investigated. The results showed that the microstructure of EBW metal was finer and tighter than TANDEM welding. The heat-affected zone of the EBW joint was narrower, its hardness was higher and the tensile strength improved substantially compared to TANDEM welding. Excellent quality control of the EBW joint was made without abnormal porosity, inclusions and micro-cracks. Beforefore, the EBW joint of 7A52 aluminum alloy showed excellent performance.