5083铝合金/E36钢熔钎焊接头组织及力学性能  

Microstructure and mechanical properties of 5083 aluminum alloy/E36 steel fusion-brazed joint

作　　者：郭柏征 闫德俊 董红刚[1] Guo Baizheng;Yan Dejun;Dong Honggang(Dalian University of Technology,Dalian 116024,Liaoning,China;CSSC Huangpu Wenchong Shipbuilding Co.,Ltd.,Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships,Guangzhou 510715,China)

机构地区：[1]大连理工大学,辽宁大连116024 [2]中船黄埔文冲船舶有限公司,广东省舰船先进焊接技术企业重点实验室,广州510715

出　　处：《焊接》2020年第3期29-34,I0016,共7页Welding & Joining

基　　金：国家自然科学基金资助项目(51374048);广东特支计划项目(2019TQ05C752)。

摘　　要：文中采用Zn-Al22药芯焊丝实现了4 mm厚5083铝合金与E36钢异种材料的TIG熔钎焊。重点研究了焊接电流对铝/钢熔钎焊接头成形、界面金属间化合物以及抗拉强度的影响。结果表明,熔钎焊接头钢侧界面生成了η-Fe2Al5Znx金属间化合物层,其中还分布有少量δ-FeZn10相;随着焊接电流逐渐增大,焊缝金属在E36钢表面的润湿铺展逐渐提升,熔宽逐渐增大,η-Fe2Al5Znx金属间化合物层增厚,δ-FeZn10相也随之增多;当焊接电流超过120 A时,界面层生成Fe-Zn金属间化合物层;较薄的η-Fe2Al5Znx金属间化合物层和分布在η-Fe2Al5Znx层中的δ-FeZn10有助于提高接头抗拉强度;铝/钢熔钎焊接头均断裂于钢侧界面,当焊接电流为110 A时,接头抗拉强度达到最大值120 MPa。Fusion-brazed joint between 4 mm thick 5083 aluminum alloy and E36 steel was obtained by GTAW with Zn-Al22 flux-cored filler wire.The influence of welding current on formation of joint,intermetallic compounds and tensile strength of the joint was investigated.η-Fe 2 Al 5 Zn x intermetallic compound layer with small amount of scatteredδ-FeZn 10 formed at the steel/weld interface.While increasing the welding current,the weld width grew larger,the spreading and wetting of molten metals on the surface of E36 steel was promoted,and the thickness ofη-Fe 2 Al 5 Zn x intermetallic compound layer and the amount ofδ-FeZn 10 also increased.When the welding current was above 120 A,Fe-Zn intermetallic compound layer formed in the interface.The thinη-Fe 2 Al 5 Zn x intermetallic compound layer and the scatteredδ-FeZn 10 withinη-Fe 2 Al 5 Zn x is beneficial for improving the tensile strength of the joint.All aluminum alloy/steel fusion-brazed joints fractured through the steel/weld interface,and the tensile strength of the joint reached the peak value of 120 MPa when the welding current was 110 A.

关 键 词：熔钎焊 铝/钢异种金属 金属间化合物 抗拉强度 

分 类 号：TG401[金属学及工艺—焊接]