6005A-5083铝合金焊接接头的微观组织与力学性能研究  

Study on microstructure and mechanical properties of the 6005A-5083 aluminum alloy welded joint

作　　者：潘柏清 丁浩 刘雄 王向东 PAN Baiqing;DING Hao;LIU Xiong;WANG Xiangdong(Manufacturing center,CRRC Times Electric Co.,Ltd.,Zhuzhou 412001,China)

机构地区：[1]株洲中车时代电气股份有限公司制造中心,湖南株洲412001

出　　处：《电焊机》2020年第6期30-38,I0004,共10页Electric Welding Machine

基　　金：中车株洲电力机车研究所有限公司机动城柜体典型构件可靠性及寿命研究项目(K10TZ20P0500)。

摘　　要：为提高接头质量和可靠性,通过微观组织观察、室温拉伸、硬度、疲劳等试验对6005A-5083焊接接头的显微组织和力学性能进行研究。结果表明:6005A-5083铝合金焊接接头焊缝成形良好,无明显焊接缺陷,焊缝组织未见异常。6005A侧熔合区存在轻微的Mg元素偏析,5083侧合金元素分布均匀。接头抗拉强度、屈服强度和伸长率的平均值分别为181MPa、115MPa、7.2%,其断口呈现韧性断裂特征,通过S-N曲线拟合得到的疲劳极限不低于75 MPa。焊接接头焊缝区域、5083侧热影响区、6005A侧热影响区宽度分别约为10mm、10mm和35mm。该焊接接头存在软化区,6005A侧熔合区为较薄弱环节。In order to improve the quality and reliability,a series of experiments including microstructure observation,room temperature tensile tests,hardness tests and fatigue tests were carried out on 6005A-5083 aluminum alloy arc welded joints.The results show that the 6005A-5083 welded joints are well formed without obvious defects.The slightly Mg segregation is observed near 6005A fusion zone while the microstructure and alloying elements distribute evenly in the 5083 fusion zone.The mean tensile strength,yield strength and elongation of the welded joints are 181 MPa,115 MPa and 7.2%,respectively.The tensile fracture morphology shows ductile characteristic.The fatigue limit obtained through S-N curve is more than 75 MPa.The width of the weld seam is about 10 mm and that between the weld seam and heat affected zone near 5083 base metal is also approximately 10 mm.Whereas the width between the weld seam and heat affected zone near 6005A base metal is about 35 mm.An obvious softening zone is determined in the heat affected zone near 6005A base metal,which might be the weakness point of this joint.

关 键 词：6005A-5083焊接接头 微观组织 力学性能 氩弧焊 

分 类 号：TG457.14[金属学及工艺—焊接]