Ca对AZ31镁合金CO_2激光焊接接头组织和性能的影响  

Effect of Ca Addition on the Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Laser Welds

作　　者：严红革[1] 陈琼[1] 陈吉华[1] 俞照辉[1] 田津[1] 石金磊[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2010年第9期55-59,共5页Journal of Hunan University:Natural Sciences

基　　金：新世纪优秀人才支持计划资助项目(NCET-06-0701)

摘　　要：采用添加填充材料的CO2激光焊接工艺对AZ31镁合金薄板进行焊接,研究了不同Ca含量对焊缝金属的显微组织和力学性能的影响.结果表明:当激光功率为1 500W,焊接速度为3 m/min时,AZ31镁合金CO2激光焊接的焊缝金属中添加一定量的σCa<0.19%元素,可以得到成分相对较均匀、组织细小的焊缝.当填充带材为AZC04(焊缝中Cσa=0.19%)时,焊缝区晶粒相对细小,析出相细小弥散,此时焊接接头的力学性能最优,焊接效率基本可达到100%.AZ31 magnesium alloy sheets were welded by CO2 laser welding with filler metal process. The effect of different amount of calcium （Ca） additions on the AZ31 laser welded joints was studiesd, and its effect on the microstructure and mechanical properties was investigated. In the fusion zone, the grains were refined with an appropriate amount of Ca addition （no more than 0.19wt%Ca）, resulting in the im- proved mechanical properties of the joints. The optimum welds were obtained with the AZC04 filler metal strip （0. 19wt%Ca contained in the fusion zone）, the grains and the precipitates in the fusion zone were both refined, and the welding efficiency of the joints was up to 100% for the base metal.

关 键 词：镁合金 CO2激光焊接 填充金属带材 CA 

分 类 号：TG456.7[金属学及工艺—焊接]