For joining aluminium and galvanized steel sheet with high efficiency and quality,the 6061 aluminium sheet and SPCC galvanized steel sheet were welding-brazed using Fronius cold metal transfer(CMT) equipment.Results show that the sample can be well welded using the proposed parameters of expert system;cross-section of the joint can be divided into three zones: the Zn-rich zone,the aluminium melted zone and the reaction layer between aluminium and steel;EDS results show that the Zn-rich zone is mainly composed of Zn and Al,and the reaction phase in the reaction layer between aluminium and steel is Fe2Al5.There are flaws in the joint,such as blow holes,cold laps and eutectic shrinkage cavities.Tensile tests show the average joint strength value was up to 80MPa;hardness tests show the average hardness of the Fe2Al5 layer,the galvanized steel and the melted aluminium are HV410,HV130 and HV55,respectively.
Key words
aluminium alloy /
galvanized steel /
welding-brazing /
microstructure /
mechanical property
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References
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