Research on brazing and artificial aging process of 3003/6A02/3003 aluminum alloy cladding sheet
1.5 mm-thick three-layered cladding sheets of aluminum alloy were prepared,with 6A02 as core materials and 3003 as cladding materials,by melting and casting,clad-ding,hot rolling,cold rolling and annealing.The treatments were carried out on the sheet,i.e.brazing simulation at 600℃,air cooling,water cooling,and artificial aging at 160℃,170℃,180℃,190℃and 200℃respectively for 2 h.The performance test results show that after 190℃artificial aging,the air-cooled sheets obtain the maximum tensile strength,yield strength and microhardness,i.e.297.1 MPa,251.8 MPa and 115.0 HV respective-ly.Overaging has already occurred at 200℃.The water-cooled sheets,after 200℃artifi-cial aging obtain the maximum tensile strength,yield strength and microhardness,i.e.320.7 MPa,291.3 MPa and 122.5 HV respectively.The grains of core materials after bra-zing are a slight greater than those before brazing,but do not grow further after artificial ag-ing.The irregular second phase in the core material is Al-Fe-Si-Mn-Cu phase which remains in the matrix after brazing.
new energy vehicle3003/6A02/3003 aluminum alloy cladding sheetbra-zingartificial aging