The resistance spot welding of 6063-716 aluminum alloy and l6 Mn steel was studied by nugget alloying.The results indicated that the Al-steel joint had characteristics of welding-brazing.The nugget zone consisted main...The resistance spot welding of 6063-716 aluminum alloy and l6 Mn steel was studied by nugget alloying.The results indicated that the Al-steel joint had characteristics of welding-brazing.The nugget zone consisted mainly of α-Al solid solution with dislocations and fine Mg_2Si particles.The interface zone had a double-layer structure:Fe_2Al_5 layer at steel side and Fe_4Al_(13) layer at Al nugget side.The nugget alloying has a significant effect on the joint properties by changing phase composition and refinement of grains.When alloy elements Cu,Zn,Ti and Ni were added,the tensile shear load of Al-steel joints reached 2 780 N,2 910 N,2 915 N and 2 929 N respectively,which increased by 24.1%,29.9%,30.1%and30.7%respectively compared with that(2 241 N) of joint without nugget alloying.Therefore,it is an effective way for improving mechanical properties of resistance spot welded Al-steel joints.展开更多
基金supported by National Natural Science Foundation of China(51275204)
文摘The resistance spot welding of 6063-716 aluminum alloy and l6 Mn steel was studied by nugget alloying.The results indicated that the Al-steel joint had characteristics of welding-brazing.The nugget zone consisted mainly of α-Al solid solution with dislocations and fine Mg_2Si particles.The interface zone had a double-layer structure:Fe_2Al_5 layer at steel side and Fe_4Al_(13) layer at Al nugget side.The nugget alloying has a significant effect on the joint properties by changing phase composition and refinement of grains.When alloy elements Cu,Zn,Ti and Ni were added,the tensile shear load of Al-steel joints reached 2 780 N,2 910 N,2 915 N and 2 929 N respectively,which increased by 24.1%,29.9%,30.1%and30.7%respectively compared with that(2 241 N) of joint without nugget alloying.Therefore,it is an effective way for improving mechanical properties of resistance spot welded Al-steel joints.