摘要
采用ER4043焊丝对6061-T6铝合金板和AISI 1045镀锌钢板进行激光熔钎焊,铝合金板的坡口面角度为30°,钢板的坡口面角度分别为30°和60°,研究了钢侧钎焊界面的显微组织和微区成分,测试了接头的拉伸性能。结果表明:钢板坡口面角度为60°时接头在焊趾和焊根处的钎焊界面处均形成富锌区,并出现微孔洞,其他区域界面处形成了连续的金属间化合物层;钢板坡口面角度为30°时接头仅在焊趾处形成富锌区,整个钎焊界面处均形成了连续的金属间化合物层;在2种接头中,钢板坡口面下部区域的金属间化合物层厚度均较大,并且钢板坡口面角度为30°时接头中的金属间化合物层厚度大于钢板坡口面角度为60°时的;钢板坡口面角度分别为30°,60°时,接头的平均抗拉强度分别为120.3,151.7 MPa,拉伸断裂均发生在钢/焊缝界面处,均为解理断裂。
6061-T6 aluminum alloy plate and AISI 1045 galvanized steel plate were welded by laser fusion brazing with ER4043 welding wires;the bevel angle of the aluminum alloy plate was 30°,and that of the steel was 30°and 60°,respectively.The microstructure and micro-zone composition of the brazing interface on the steel side were studied,and the tensile properties of the joint were tested.The results show that zinc-rich areas and microvoids were formed at weld toe and weld root on the brazing interface of the joint when the bevel angle of steel plate was 60°,and a continuous intermetallic compound layer was formed at other areas on the interface.For the joint wth the steel plate bevel angle of 30°,zinc-rich areas were only formed at the weld toe,and a continuous intermetallic compound layer was formed at the entire brazing interface.In the two joints,the thickness of the intermetallic compound layer on the lower area of the steel plate groove surface was higher.The thickness of the intermetallic compound layer in the joint with the steel plate bevel angle of 30°was greater than that with the steel plate bevel angle of 60°.The average tensile strength of joints with the steel bevel angles of 30°and 60°was 120.3,151.7 MPa,respectively.The two joints fractured at the steel/weld interface during tension,and both fractured in cleavage fracture form.
作者
杨扬
周信
于霜
柏余杰
吕亚男
YANG Yang;ZHOU Xin;YU Shuang;BAI Yujie;Lv Yanan(Department of Mechanical and Electrical Engineering,Suzhou Vocational Institute of Industrial Technology,Suzhou 215104,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2021年第12期55-61,共7页
Materials For Mechanical Engineering
关键词
激光熔钎焊
铝合金
镀锌钢
金属间化合物
拉伸性能
laser fusion brazing
aluminum alloy
galvanized steel
intermetallic compound
tensile property
