2219铝合金搅拌摩擦焊结构ECA评定  

Engineering Critical Assessment on Friction-Stir-Welded 2219 Aluminum Alloy Structure

作　　者：曹学敏 田志杰[2] 熊林玉[2] 马核 张彦华[1] CAO Xuemin;TIAN Zhijie;XIONG Linyu;MA He;ZHANG Yanhua(School of Mechanical Engineering and Automation,Beihang University,Beijing 100191;Capital Aerospace Machinery Company,Beijing 100076)

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100191 [2]首都航天机械公司,北京100076

出　　处：《宇航材料工艺》2019年第2期66-71,共6页Aerospace Materials & Technology

基　　金：国防基础科研资助(JCKY2014203A001);民用航天预研资助(科工一司[2014]618号)

摘　　要：基于含缺陷结构断裂评定的COD设计曲线与净截面屈服失效判据,对2219铝合金搅拌摩擦焊结构进行了工程临界评定(ECA)。分析了2219铝合金搅拌摩擦焊接头焊核区、热机影响区、热影响区和母材区的临界裂纹尺寸,确定了不同载荷水平下2219铝合金搅拌摩擦焊结构的表面缺陷容限,并对特定内压下2219铝合金运载火箭贮箱筒段搅拌摩擦焊纵缝进行了ECA评定,为2219铝合金搅拌摩擦焊结构的断裂控制提供了参考。研究结果表明,纵向前进边热影响区为2219铝合金搅拌摩擦焊接头断裂控制的关键区域,特定内压条件下给定的表面缺陷可以接受。Based on the failure criteria including COD design curves and net section yield, engineering critical assessment (ECA) on 2219 aluminum alloy structure welded by friction stir welding (FSW) was carried out. Critical crack sizes of Nugget zone (NZ), thermo-mechanically affected zone (TMAZ), heat affected zone (HAZ) and base material (BM) of 2219 aluminum alloy FSW joint were calculated. The surface defect tolerances of friction-stir-welded 2219 aluminum alloy structure under different stress-level were obtained, and ECA on longitudinal FSW joint of launch vehicle tank under a certain pressure inside the cylinder was executed. ECA method in this study provides a reference for fracture control of friction-stir-welded aluminum alloy structure. Results show that HAZ at the longitudinal advancing side is the key area for the fracture control of the 2219 aluminum alloy FSW joint. The given surface defects are acceptable under specific internal pressure.

关 键 词：2219铝合金 搅拌摩擦焊 ECA评定 贮箱 

分 类 号：TG4[金属学及工艺—焊接]