Influence of Rare Earth Ce on Hydrogen Content and Weld Porosity of Sr Modified Al-5Si Aluminum Alloy Welding Wires
ZHANG Peng1, XUE Songbai1, FEI Wenpan1, WANG Bo1, HAN Yilong1, PEI Yinyin2, ZHONG Sujuan2
1 College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China 2 State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450002,China
Abstract: The effects of rare earth Ce on the hydrogen-absorption tendency of Sr modified molten Al-5Si welding wire, hydrogen content of the welding wire and porosity of the welds were investigated by means of pressure reduction and solidification method, solid-state hydrogen measurement and X-ray detection, respectively. A notable increase in the hydrogen content of Al-5Si aluminum alloy welding wire and porosity of the welds was observed when 0.02wt% Sr was added exclusively. Additionally, when 0wt%~0.05wt% Ce was introduced into Al-5Si-0.02Sr wel-ding wire, the increase of Ce content brought about the decline in hydrogen content of Al-5Si-0.02Sr-xCe welding wire. And Al-5Si-0.02Sr-xCe welding wire achieved the minimum hydrogen content of 0.07 mL/(100 g Al) under the condition of 0.05wt% Ce, which was 81.6% lower than that of Al-5Si-0.02Sr welding wire. Further raise of Ce content to 0.1wt% failed to make any difference in the hydrogen content of Al-5Si-0.02Sr welding wire. In terms of the weld porosity, it generally shared the same variation trend of hydrogen content of the welding wire caused by the increasing Ce content. Moreover, welds free of gas pore was successfully accessible, when Ce content was no less than 0.05wt%. Adding Ce to Al-5Si-0.02Sr welding wire could scarcely exert any effect on the tensile properties of the welding joints, but obviously improve the bending pro-perties and ductility.
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2020, Vol. 34 
