焊接电流对5052铝合金TIG焊接接头组织与性能的影响
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摘要
为研究焊接电流对5052铝合金非熔化极惰性气体保护焊(TIG)焊接质量的影响,对100～120 A电流下TIG焊接所得焊接接头的显微组织、力学性能和耐蚀性进行了探讨。结果表明,当焊接电流从100 A增加到120 A时,5052铝合金TIG焊接接头的强度随电流的增大而增大,塑性随电流的增大而减小;当电流为115 A时所得接头的综合力学性能最好,此时抗拉强度为212.1 MPa,达到母材抗拉强度的90.8%,断面收缩率为28.9%,比母材50.3%的断面收缩率降低约一半。随着焊接电流的增大,腐蚀的类型从点蚀为主转变到以晶间腐蚀为主,但腐蚀电流的变化规律不明显。
To investigate the influence of welding current on the welding quality of the TIG welding of 5052 aluminum alloy, the mechanical properties, microstructure and corrosion resistance of the welded joints obtained by different currents which array form 100 A to 120 A were discussed. The results showed that when the welding current is 100～115 A, with the increases of welding current, the strength of the welded joint increases, and the corrosion tendency decreases, but the plasticity decreases. When the current is 115 A, the joint possesses the best comprehensive mechanical performance, and the tensile strength is 212.1 MPa, reaching 90.8 % of the tensile strength of the base metal, and the reduction of area is 28.9 %, about half of which is lower than the 50.3 % of the base metal. With the increase of welding current, the corrosion type changed from pitting corrosion to intercrystalline corrosion, but the change rule of corrosion current was not obvious.
To investigate the influence of welding current on the welding quality of the TIG welding of 5052 aluminum alloy, the mechanical properties, microstructure and corrosion resistance of the welded joints obtained by different currents which array form 100 A to 120 A were discussed. The results showed that when the welding current is 100～115 A, with the increases of welding current, the strength of the welded joint increases, and the corrosion tendency decreases, but the plasticity decreases. When the current is 115 A, the joint possesses the best comprehensive mechanical performance, and the tensile strength is 212.1 MPa, reaching 90.8 % of the tensile strength of the base metal, and the reduction of area is 28.9 %, about half of which is lower than the 50.3 % of the base metal. With the increase of welding current, the corrosion type changed from pitting corrosion to intercrystalline corrosion, but the change rule of corrosion current was not obvious.
引文
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[2] KIM S J,PARK J C,CHONG S O.Investigation on Corrosion Protection Potential by Electrochemical Experiment in Sea Water of 5052-O Al Alloy for Leisure Ship[M].Mokpo city,South Korea:Mokpo City Pivision of Morinc System Engineering,2010.
[3] SINGH D,DASH P K.Role of damage parameters in remaining life assessment of composites in aircraft structures[J].ProcediaEngineering,2012,38:2702-2712.
[4] MIN H E,FUGUO L I,WANG Z.Forming limit stress diagram prediction of aluminum alloy 5052 based on GTN model parameters determined by in situ tensile test[J].中国航空学报(英文版),2011,24(3):378-386.
[5] KIM J S,KIM I J,KIM Y G.Optimization of welding current waveform for dissimilar material with DP590 and Al5052 by Delta-spot welding process[J].Journal of Mechanical Science & Technology,2016,30(6):2713-2721.
[6] KWON Y J,SHIM S B,PARK D H.Friction stir welding of 5052 aluminum alloy plates[J].Transactions of Nonferrous Metals Society of China,2009,19(s1):23-27.
[7] ZHANG Z,YANG X,ZHANG J,et al.Effect of welding parameters on microstructure and mechanical properties of friction stir spot welded 5052 aluminum alloy[J].Materials & Design,2011,32(8-9):4461-4470.
[8] ZHANG H J,WANG M,ZHU Z,et al.Impact of shoulder concavity on non-tool-tilt friction stir welding of 5052 aluminum alloy[J].International Journal of Advanced Manufacturing Technology,2018:96(1-4):1497-1506.
[9] REDDY P J,KAILAS S V,SRIVATSAN T S.Effect of Tool Angle on Friction Stir Welding of Aluminum Alloy 5052:Role of Sheet Thickness[J].Advanced Materials Research,2012,410(1):196-205.
[10] SONG C Y,PARK Y W,KIM H R,et al.The use of Taguchi and approximation methods to optimize the laser hybrid welding of a 5052-H32 aluminium alloy plate[J].Proceedings of the Institution of Mechanical Engineers Part B Journal of Engineering Manufacture,2008,222(4):507-518.
[11] LI Y Q,ZHAO X H,ZHAO H,et al.Study on the effect of welding current during laser beam-resistance seam welding of aluminum alloy 5052[J].China Welding,2008,17(2):42-46.
[12] ZHANG H G,JIN X Z,CHEN G Y,et al.Study on the burning loss of magnesium element in fiber laser welding aluminum alloy 5052[J].Laser Technology,2012,36(6):713-718.
[13] ZHANG J,ZHANG W,LIU W.Research on the welding process of aluminum alloy based on high power fiber laser[C]// Society of Photo-Optical Instrumentation Engineers.Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series.Shanghai,China:Los Anaeles SPIE,2017:10339.
[14] 肖荣诗,陈铠,左铁钏.高强铝合金激光焊接新进展[J].应用激光,2002,22(2):206-208.
[15] 黄旺福,黄金刚.铝及铝合金焊接指南[M].长沙:湖南科学技术出版社,2004:125-126.
[16] KUMAR A,SUNDARRAJAN S.Optimization of pulsed TIG welding process parameters on mechanical properties of AA 5456 Aluminum alloy weldments[J].Materials & Design,2009,30(4):1288-1297.
[17] 徐正.7005/7075中高强度铝合金的应用研究[D].南京:南京理工大学,2007.
[18] 王锡岭.喷射成7xxx系铝合金TIG焊工艺及性能研究[D].镇江:江苏科技大学,2011.
[19] 廖传清,宿国友,高艳芳,等.7075/5A06异种铝合金TIG焊接头的显微组织和力学性能[J].中国有色金属学报,2015,25(1):43-48.
[20] 王培吉,陈康华,姜慧丽,等.7003铝合金TIG焊焊接接头的组织与性能[J].粉末冶金材料科学与工程,2016,21(6):832-839.
[21] 廖慧敏,何鸿雁,杨阳,等.不同焊接热输入下AZ31镁合金TIG焊接接头的显微组织与力学性能[J].机械工程材料,2017,41(3):24-28.
[22] 田志杰,宋泓宇,王忠义,等.热输入对2219铝合金TIG焊缝热影响区组织演变的影响[J].焊接技术,2016,45(2):28-30.
[23] ZHAO M C,SCHMUTZ P,BRUNNER S,et al.An exploratory study of thecorrosion of Mg alloys during interrupted salt spray testing[J].Corrosion Science,2009,51(6):1277-1292.
[24] 云凤玲,徐克.重金属离子对5052铝合金耐蚀性能的影响[J].化学工业与工程,2010,27(2):173-176.