焊透深度和前进侧位置对FSW贮箱锁底接头性能的影响  

Efect of FSW Pin Length and AS Location on Mechanical Properties of Lock Joint of Tank

作　　者：郝云飞[1] 王国庆[2] 厉晓笑[1] 赵衍华[1] 刘伟[1] 

机构地区：[1]首都航天机械公司,北京100076 [2]中国运载火箭技术研究院,北京100076

出　　处：《宇航材料工艺》2014年第6期14-19,共6页Aerospace Materials & Technology

摘　　要：文摘开展了2219MCS叉形环和2219C10S短壳组成的锁底接头的搅拌摩擦焊工艺试验,详细分析了搅拌针长度和前进侧位置对锁底接头Hook型缺陷、力学性能、断裂方式的影响规律。结果表明:搅拌摩擦焊锁底接头在短壳一侧存在Hook型缺陷,短壳位于前进侧时的搭接界面上翘曲率和迁移量均大于叉形环位于前进侧,且随着搅拌针长度的增加,搭接界面的向上迁移量逐渐增大。相同的焊透深度时,叉形环位于前进侧的力学性能优于短壳位于前进侧;相同的前进侧位置时,随着焊透深度的逐渐增加,接头力学性能逐渐降低。锁底接头搭接界面缺陷形貌及迁移量的变化是引起力学性能变化的主要原因。优化的试验结果显示,当焊透深度和短壳板材厚度相同,且叉形环位于焊缝前进侧的力学性能最优,常温可达到300 MPa,低温可达到370MPa,延伸率均超过3.5%。锁底接头的拉伸断裂方式与焊缝前进侧位置密切相关。当短壳位于前进侧时,从短壳一侧热力影响区断裂;当叉形环为前进侧时,从焊缝焊核区断裂。An extensive investigation has been carried out on the friction stir welded lock joint consisted of a 2219MCS ring and a 2219C10S barrel, and the effect of the FSW pin length and AS location on the Hook defect, me- chanical property and fracture mode of the lock joint has been systematically analyzed in this paper. As the results in- dicated that, there is a hook defect located in junction of the assembly interface and nugget zone, and the warping rate and the migration amount of the junction when 2219C10S barrel located in AS location is greater than 2219MCS ring located in AS. And the migration amount of the junction increased with the FSW pin length. The results of the tensile tests indicated that the mechanical performance of the lock joint with the 2219MCS ring located in AS is better than the 2219C10S barrel located in AS, and the mechanical properties reduced gradually with the increase of the FSW pin length. As analyzed, the morphology of the hook defect and the migration amount are the main reasons for the change of the mechanical properties with the AS location and FSW pin length. The optimized investigation results show that the room temperature mechanical strength can be up to 300 MPa, the low temperature strength is 370 MPa, and the ductility is all more than 3.5%. The tensile failure mode of the FSWed lock joint is closely related to the AS location of the 2219MCS ring or 2219C10S barrel.

关 键 词：锁底接头 搅拌摩擦焊接 Hook型缺陷 力学性能 

分 类 号：TG4[金属学及工艺—焊接]