摘要
在2024/7075异种铝合金搅拌摩擦焊的搭接试验中,重点对比分析3 mm与4 mm两种针长下搭接接头横截面形貌及断裂载荷的差异.结果表明,搅拌头转速的增加会加剧上板与下板材料间的混合程度,小的搅拌针扎入量更易获得大的有效板厚与有效搭接宽度.当转速在800~1 200 r/min变化时,使用3 mm针长搅拌头所得搭接接头EST值随着转速先减小后增加,4 mm针长所得EST值则随着转速的增加而逐渐增加;3 mm针长与4 mm针长分别在800 r/min与1 200 r/min下获得了搅拌摩擦焊搭接接头的最大断裂载荷值,其值分别是10.3 k N与10.7 k N;搭接接头主要呈现拉伸断裂.
During the experiment dissimilar 2024/7075 Al alloys were friction stir lap welded. The cross sections and lap shear failure loads of lap joints under 3 mm and 4 mm pin lengths were compared. The experimental results showed that the mixing of materials between the upper and lower sheets was heightened with increasing rotational speed of tool. Lower plunge depth of tool pin more easily attained the higher effective sheet thickness and bigger effective lap width. When the rotational speed varied from 800 r/min to 1 200 r/min,the ESTs got by 3 mm pin length decrease firstly then increase with the rotational speed increase,and the ESTs got by 4 mm pin length increase with the rotational speed increase. The maximum shear failure loads of friction stir lap welding joint by 3 mm and 4 mm pin lengths were attained at 800 r/min and 1 200 r/min,respectively. And the values were 10. 3 kN and 10. 7 kN. The welding lap joints mainly presented tensile fracture mode.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2018年第6期91-95,共5页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(51075102)
