未焊透缺陷深度对LY12铝合金搅拌摩擦焊焊缝电导率的影响-材料工程.PDF

LY 12 1 LY12 Effect of the Lack of Penetration on the Conductivity of LY12 Aluminum Alloy Friction Stir Welds , , , ( , 006 ) ZHANG Xiao-fan, XING Li, YANG Cheng-gang, KE L-i ming ( Aeronautical Key Laboratory of the Hot-w orking Technology for M aterials, Nanchang Hangkong University, Nanchang 006 , China) : , LY 12 , , , , , , , , : ; ; ; : T G45 . 9 : A : 1001-4 81(2010) 02-001 -04 Abstract: T he eddy current conductivity gauge w as used to measure the conductivity distribution of the w eld cross section and the conductivity at the original w eld line w ith different depth of the lack of penetration ( LOP) defect in the friction stir w eld of LY 12 aluminum alloy. T he results show that, the conductivity in the nugget zone is higher than the base metal, and there is a transient zone betw een these tw o areas. T he variation of conductivity is related w ith the microstructure in the w eld. The depth of the LOP defect affects the distribution of the conductivity in the w eld. If the depth of the LOP is small, the conductivity of the w elds is almost same as the w elds w ithout any defect. On the contrary, If the depth of the LOP is big, the conductivity at the centre of the w eld decreased dramatic- ally , and the deeper the defect is, the low er conductivity is. Key words: friction stir w elding; LOP; eddy current; conductivity [ 5] ( Friction Stir Welding, FSW) , , [ 6