摘要
对2 mm 2A12-T4铝合金薄板采用复合搅拌摩擦点焊进行焊接,测试不同旋转半径下的复合搅拌摩擦点焊接头的抗剪力,并观察和分析复合搅拌摩擦点焊接头在拉伸时的断裂途径及微观组织.结果表明:当其他参数不变时,复合搅拌摩擦点焊接头抗剪力和断裂途径随旋转半径和塑性环形貌的不同而变化;在旋转半径为1.2 mm时,接头的抗剪力达到最大值为2 948 N;随着旋转半径增大,热输入增大,接头塑性环区增宽并致密,使接头抗剪力增大,但过大的旋转半径则因热输入过大,使塑性环区致密度降低,并出现孔洞等缺陷,接头抗剪力降低;焊点塑性环区晶粒最细小,组织致密,硬度最高.
The com-stir friction stir spot welding is adopted to make lap joints on the thin aluminum alloy board 2A12-T4 with a thickness of 2 mm.The joints are tested by shearing resistance at different rotary radii of com-stir FSSW.Fracture path and microstructure are observed and analyzed.Experimental results show that when other parameters remain constant and the rotary radius is 1.2 mm,the maximum shearing resistance of the joint can be realized and is 2 948 N.Moreover,as the rotary radius increases,the heat input increases.Macroscopic structure of stirred-zone widens and compacts,and shearing resistance increases,too.But large rotary radius may lead to large heat input,and it decreases the density of the macroscopic structure of stirred-zone.Also,holes and other defects occur,and the joint shearing resistance reduces.The metal flows intensively in the stirred zone that has some characteristics including minute grain size,compact structure and hard zones.
出处
《江苏科技大学学报（自然科学版）》
CAS
北大核心
2011年第5期423-426,共4页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
江苏省自然科学基金资助项目(BK2010342)
江苏省科技支撑计划基金资助项目(BE2009126)
关键词
铝合金
复合搅拌摩擦点焊
塑性环
抗剪力
aluminum alloy
com-stir friction stir spot welding
macroscopic structure of stirred-zone
shearing resistance
