2219-T87铝合金拉锻式摩擦塞补焊接头组织及性能
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摘要
对6 mm厚的2219-T87铝合金板进行了拉锻式摩擦塞补焊试验,对焊接接头的微观组织、显微硬度、抗拉强度及拉伸断口进行了观察与测试.结果表明,采用优化的摩擦塞补焊工艺可实现2219-T87铝合金母材和2219-T87铝合金塞棒的冶金连接.拉锻式摩擦塞补焊过程中,塞棒承受拉应力,应优化接头设计和焊接工艺参数从而防止塞棒被拉断.未焊合是接头的主要缺陷,易出现在接头的近上表面处.焊缝区发生明显软化,最低硬度出现在靠近连接界面的塞棒热力影响区,最低值为84.4 HV.接头的抗拉强度可达326.4 MPa,断后伸长率可达4.45%,抗拉强度和断后伸长率分别为母材的71.7%和44.5%,拉伸断口呈韧窝形貌.
Friction pull plug welding(FPPW)experiments were performed for 6 mm thick 2219-T87 aluminum alloy. The microstructures, microhardness, tensile strength and tensile fracture surface of FPPW joints were observed and tested respectively. It is verified that metallurgical combination was realized between 2219-T87 plate and 2219-T87 plug using optimized FPPW process. In FPPW process, plug was subjected to tensile stress. Joint design and welding parameters are optimized to prevent plug from being broken off. Lack of bonding was the main defect for FPPW joint, which was easily formed near the upper surface. Softening was observed in the weld zone, the minimum hardness(84.4 HV) appeared in plug thermomechanical affected zone. The tensile strength and elongation of FPPW joint can reach to 326.4 MPa and 4.45%, which are equivalent to 71.7% and 44.5% of the base metal. The tensile fracture morphologies are characterized by dimples.
Friction pull plug welding(FPPW)experiments were performed for 6 mm thick 2219-T87 aluminum alloy. The microstructures, microhardness, tensile strength and tensile fracture surface of FPPW joints were observed and tested respectively. It is verified that metallurgical combination was realized between 2219-T87 plate and 2219-T87 plug using optimized FPPW process. In FPPW process, plug was subjected to tensile stress. Joint design and welding parameters are optimized to prevent plug from being broken off. Lack of bonding was the main defect for FPPW joint, which was easily formed near the upper surface. Softening was observed in the weld zone, the minimum hardness(84.4 HV) appeared in plug thermomechanical affected zone. The tensile strength and elongation of FPPW joint can reach to 326.4 MPa and 4.45%, which are equivalent to 71.7% and 44.5% of the base metal. The tensile fracture morphologies are characterized by dimples.
引文
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[2]Richard F.Bringing aerospace welding specifications up to standard[J].Welding and Metal Fabrication,2000,68(7):12-14.
[3]Metz D F,Barkey M E.Fatigue behavior of friction plug welds in2195 Al-Li alloy[J].International Journal of Fatigue,2012,43(1):178-187.
[4]Metz D F,Weishaupt E R,Barkey M E,et al.A microstructure and microhardness characterization of a friction plug weld in friction stir welded 2195 Al-Li[J].Journal of Engineering Materials&Technology,2012,134(2):1-7.
[5]栾国红,季亚娟,董春林,等.LY12铝合金摩擦塞补焊接头组织分析[J].焊接学报,2006,27(10):1-3.Luan Guohong,Ji Yajuan,Dong Chunlin,et al.Microstructure of LY12 aluminium alloy welded joint of friction plug welding[J].Transactions of the China Welding Institution,2006,27(10):1-3.
[6]陈忠海,陈家庆,焦向东,等.2024铝合金圆柱形组合的FHPP试验分析[J].焊接学报,2009,30(11):1-3.Chen Zhonghai,Chen Jiaqing,Jiao Xiangdong,et al.Experimental analysis on friction hydro pillar processing of cylindrical coup-ling of 2024 aluminum alloy[J].Transactions of the China Welding Institution,2009,30(11):1-3.
[7]杜波,孙转平,杨新岐,等.异种铝合金摩擦塞补焊接头微观组织及性能[J].机械工程学报,2017,53(4):43-48.Du Bo,Sun Zhuanping,Yang Xinqi,et al.Microstructure and mechanical properties of friction plug welding joints for dissimilar aluminum alloys[J].Journal of Mechanical Engineering,2017,53(4):43-48.
[8]Du Bo,Sun Zhuanping,Yang Xinqi,et al.Characteristics of friction plug welding to 10 mm thick AA2219-T87 sheet:Weld formation,microstructure and mechanical property[J].Materials Science&Engineering A,2016,654:21-29.
[9]Du Bo,Sun Zhuanping,Yang Xinqi,et al.Weakening mechanism and tensile fracture behavior of AA 2219-T87 friction plug welds[J].Materials Science&Engineering A,2017,693:129-135.
[10]赵衍华,刘景铎,张加涛,等.2014铝合金拉锻式摩擦塞补焊接头微观组织及力学性能[J].航空制造技术,2009(23):86-90.Zhao Yanhua,Liu Jingduo,Zhang Jiatao,et al.Microstructure and mechanical property of friction plug welding joint of 2014 Al alloy[J].Aeronautical Manufacturing Technology,2009(23):86-90.
[11]赵衍华,刘景铎,张丽娜,等.2014铝合金搅拌摩擦焊缝的拉锻式摩擦塞补焊[J].航空材料学报,2010,30(1):41-46.Zhao Yanhua,Liu Jingduo,Zhang Lina,et al.Study on Friction Plug Welding of 2014 Aluminum Alloy FSW Joint[J].Journal of Aeronautical Materials,2010,30(1):41-46.
[12]王国庆,赵衍华,孔德跃,等.LD10铝合金熔焊接头缺陷的拉锻式摩擦塞补焊[J].焊接,2010(6):38-42.Wang Guoqing,Zhao Yanhua,Kong Deyue,et al.Friction pull plug welding of LDl0 aluminum alloy defects in TIG joints[J].Welding&Joining,2010(6):38-42.