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陈志元，颉平平，王一，等.2A14铝合金VPTIG焊交叉焊缝组织与力学性能［J］.电焊机，2023，53（10）：97-102.
CHEN Zhiyuan, XIE Pingping, WANG Yi, et al.Study on Microstructure and Mechanical Properties of 2A14 Aluminum Alloy VPTIG Welded Cross Joint[J].Electric Welding Machine, 2023, 53(10): 97-102.
采用变极性钨极氩弧焊（单面两层，VPTIG打底+VPTIG盖面）工艺对2A14-CS态δ6 mm铝合金进行VPTIG,1,+VPTIG,2,交叉焊缝焊接试验，对比研究交叉焊缝与单一VPTIG焊缝的微观组织和力学性能。结果表明，交叉焊缝相较单一VPTIG焊缝拉伸性能下降，其抗拉强度下降5.4%~6.6%，断后延伸率下降19.2%~23.6%，塑性下降更明显。交叉焊缝硬度与单一VPTIG焊缝硬度规律一致，从母材到焊缝中心硬度均呈现先下降后局部上升再下降的趋势，但交叉焊缝焊缝区及靠近焊缝的部分热影响区硬度较单一VPTIG焊缝明显下降。交叉焊缝微观组织呈树状枝晶和胞状枝晶形态，其打底层焊缝相较单一VPTIG焊缝晶粒更粗大且大小不均匀分布，导致交叉焊缝的力学性能下降。交叉焊缝断裂机制与单一VPTIG接头断裂机制一致，为混合型断裂机制，即以晶界韧性断裂为主，并伴随有微裂纹源受力扩展开裂、微孔聚合型断裂。交叉焊缝断口相较单一VPTIG接头断口呈现韧窝少且浅、微裂纹源受力扩展开裂更明显的特征。
In this paper, the welding test of VPTIG,1,+VPTIG,2, cross joint of 2A14-CS state δ 6mm aluminum alloy is carried out by single-side two-layer welding (argon arc backing+argon arc capping) process, and the microstructure and mechanical properties of the cross joint and single VPTIG welded joint are compared. The results show that the tensile strength of cross joint decreases by 5.4%~6.6% compared with that of single VPTIG welded joint; the elongation after fracture decreases by 19.2%~23.6%, and the plasticity decreases more significantly. The hardness of cross joint is consistent with that of single VPTIG welded joint; from the base metal to the weld center, the hardness shows a trend of first decreasing, then locally increasing and then decreasing, but the hardness of the weld zone of the cross joint and the part of the heat affected zone near the weld is significantly lower than that of the single VPTIG welded joint. The microstructure of the cross joint is in the form of dendrite and cellular dendrite. Compared with the single VPTIG welded joint, the grain size of the backing layer cross weld is thicker and unevenly distributed, which leads to the decline of the mechanical properties of the cross joint. The fracture mechanism of cross joint is the same as that of single VPTIG joint, which is a mixed fracture mechanism; that is, grain boundary ductile fracture is the main fracture, accompanied by microcrack source stress propagation crack and microporous polymerization fracture. However, compared with single VPTIG joint, the fracture of cross joint has fewer dimples and is shallow, and the microcrack source has more obvious characteristics of stress propagation cracking.
2A14铝合金VPTIG交叉焊缝微观组织力学性能
2A14 aluminum alloyVPTIGcross jointmicrostructuremechanical properties
鄢东洋， 郭彦明， 董曼红， 等. 贮箱结构用2A14和2219铝合金的特性研究与分析［J］. 导弹与航天运载技术， 2019（3）： 102-107.
YAN D X， GUO Y M， DONG M H， et al. Analysis and discuss on the characteristics of 2A14 and 2219 aluminum alloy used in the rocket tank［J］. Missiles and Space Vehicles， 2019（3）： 102-107.
刘春飞. 新一代运载火箭箱体材料的选择［J］. 航空制造技术， 2003（2）： 22-27.
Liu C F. Material selection for new2type launch vehicle tank［J］. Aeronautical Manufacturing Technology， 2003（2）： 22-27.
刘观日， 雷勇军， 刘德博， 等. 推进剂贮箱用2A14 铝合金接头应力腐蚀性能研究［J］. 宇航材料工艺， 2017， 47（2）： 43-46，55.
LIU G R， LEI Y J， LIU D B， al. Stress corrosion study of 2A14 alloy joint used on propellant tank［J］. Aerospace Materials & Technology， 2017， 47（2）： 43-46，55.
李渊，李晓延，李辉，等. 2A14铝合金TIG焊组织及力学性能不均匀性分析［J］.电焊机，2018，48（07）：57-61.
LI Y， LI X Y， LI H， al. Analysis on nonuniformity of microstructure and mechanical properties of VPTIG welded aluminum alloy joints［J］. Electric Welding Machine， 2018， 48（07）： 57-61.
李艳军， 康举， 吴爱萍， 等. TIG 焊工艺对LD10 铝合金接头气孔的影响［J］. 焊接学报， 2014， 35（4）： 38-40.
LI Y J， KANG J， WU A P， al. Influence of TIG welding parameters on porosity in LD10 aluminum alloy joint［J］. Transactions of The China Welding Institution， 2014， 35（4）： 38-40.
李颖，张聃，徐奎，等. 2A14 T6铝合金FSW及VP-TIG 焊接对比分析［J］. 电焊机，2019，49（02）：19-23.
LI Y， ZHANG D， XU K， al. Comparative analysis of FSW and VP-TIG for 2A14 T6 aluminum alloy［J］. Electric Welding Machine， 2019， 49（02）： 19-23.
孔祥峰， 林涛， 陈华斌. 2219 铝合金交叉焊缝的微观组织与力学性能分析［J］. 上海交通大学学报， 2010， 44： 95-98.
KONG X F， LIN T， CHEN H B. Microstructures and mechanical property of 2219 aluminum alloy crossing joint［J］. Journal of Shanghai Jiaotong University， 2010， 44： 95-98.
赵英杰， 孟占兴， 孙广达， 等. 2A14 铝合金熔焊与搅拌摩擦焊交叉焊缝组织与力学性能［J］. 宇航材料工艺， 2020（4）： 97-102.
ZHAO Y J， MENG Z X， SUN G D， al. Microstructure and mechanical properties of 2A14 aluminum alloy intersection joints by tig welding and friction stir welding［J］. Aerospace Materials & Technology， 2020（4）： 97-102.
张海， 封小松， 刘仁培. 2219 铝合金FSW-VPPA 交叉焊缝组织与力学性能［J］. 焊接学报， 2012， 33（7）： 77-80.
ZHANG H， FENG X S， LIU R P. Microstructure and mechanical properties of 2219 aluminum alloy intersection weld by FSW and VPPA［J］. Transactions of The China Welding Institution， 2012， 33（7）： 77-80.
刘文胜， 刘东亮， 马运柱，等. 变形温度对2A14铝合金显微组织和力学性能的影响［J］. 中国有色金属学报， 2015， 25（2）： 308-314.
LIU W S， LIU D L， MA Y Z， al. Effects of deformation temperature on microstructure and mechanical properties of 2A14 aluminum alloy［J］. The Chinses Journal of Nonferrous Metals， 2015， 25（2）： 308-314.
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