6A01铝合金激光-MIG复合焊和MIG焊接头性能研究
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摘要
分别采用激光-MIG复合焊和MIG焊对3 mm厚的6A01-T5铝合金型材进行焊接,使用体式显微镜、金相显微镜、维氏硬度计、电子万能试验机等研究两种焊接接头的宏观金相、显微组织、硬度分布、拉伸性能和弯曲性能,并用高频疲劳试验机对比分析两种焊接接头平滑件的疲劳性能。结果表明:激光-MIG复合焊和MIG焊接头成形良好;激光-MIG复合焊抗拉强度高于MIG焊,激光-MIG复合焊接头中的焊缝区硬度最低,MIG焊的在离熔合线5 mm的母材"过时效"软化区;激光-MIG复合焊疲劳强度高于MIG焊,焊缝第二相尺寸较小且弥散;激光-MIG复合焊接头综合性能优于MIG焊。
Laser?MIG hybrid welding and MIG welding were used to weld 3 mm thickness 6A01 aluminium alloy,and two kinds welding joints were obtained. In order to research the basic properties of the joints,the macrostructure,microstructure,hardness distribution,tensile and bending properties were analyzed by using stereomicroscope,metallographic microscope,Vickers hardness tester and electronic universal machine. The high?frequency fatigue machine was used to obtain the fatigue strength of joints. The result shows that the quality of both laser?MIG hybrid welding and MIG welding is acceptable,the tensile strength of laser?MIG hybrid welding joint is higher than that of MIG,the minimum hardness part of laser?MIG hybrid welding joint is weld metal,while that of MIG welding joint is soften zone at base metal,5 mm away from fusion line. The smaller size and more dispersed distribution of second phase lead to the higher fatigue strength of laser?MIG hybrid welding joint. The comprehensive properties of joint by laser?MIG hybrid welding are better than those by MIG welding.
Laser?MIG hybrid welding and MIG welding were used to weld 3 mm thickness 6A01 aluminium alloy,and two kinds welding joints were obtained. In order to research the basic properties of the joints,the macrostructure,microstructure,hardness distribution,tensile and bending properties were analyzed by using stereomicroscope,metallographic microscope,Vickers hardness tester and electronic universal machine. The high?frequency fatigue machine was used to obtain the fatigue strength of joints. The result shows that the quality of both laser?MIG hybrid welding and MIG welding is acceptable,the tensile strength of laser?MIG hybrid welding joint is higher than that of MIG,the minimum hardness part of laser?MIG hybrid welding joint is weld metal,while that of MIG welding joint is soften zone at base metal,5 mm away from fusion line. The smaller size and more dispersed distribution of second phase lead to the higher fatigue strength of laser?MIG hybrid welding joint. The comprehensive properties of joint by laser?MIG hybrid welding are better than those by MIG welding.
引文
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[14]尹志民,张爱琼,王炎金. 6005A铝合金型材焊接接头组织与性能[J].轻合金加工技术,2001(1):32-34.
[2]周东海,张志昌,陈婧雯. A6N01S-T5铝合金激光-MIG复合焊接头的性能及疲劳寿命分析[J].轨道交通装备与技术,2017,3:9-14.
[3]刘俊.铝合金激光焊接工艺特性[J].现代制造工程,2003(3):55-56.
[4]GUAN Shaokang,YAO Bo,WANG Yingxin. The progress and prospect of research on aluminium alloys for auto body sheets[J].Materials For Mechanical Engineering,2001,25(5):12.
[5]SANCHEZ?AMAYA J M,DELGADO T,et al. Laser welding of aluminium alloys 5083 and 6082 under conduction regime[J].Applied Surface Science,2009,255(23):9512.
[6]季卫东,陈辉. 10 mm厚6005A铝合金激光-MIG复合焊接[J].电焊机,2014,44(9):128-132.
[7]雷祥,单际国,郑世卿,等.焊接工艺对6005A铝合金激光-MIG复合焊焊缝成形的影响[J].焊接,2008(7):25-32.
[8]陈凯,肖荣诗,左铁钏.高强铝合金激光焊接新进展[J].激光应用,2002(2):206-208.
[9]张翔.高速列车用A6N01-T5铝合金激光-MIG复合焊接头疲劳性能研究[J].热加工工艺,2017,46(7):64-71.
[10]胡雅楠,吴圣川,张思齐,等.基于三维X射线成像的激光复合焊接7020铝合金的组织与力学特性演变[J].中国激光,2016,43(1):84-92.
[11]张国伟,肖荣诗. 5083铝合金厚板超窄间隙光纤激光焊接接头组织与性能[J].中国激光,2014,41(9):108-114.
[12]方喜风,汪认,王小朋,等.高速列车6N01铝合金型材激光-MIG复合焊研究[J].焊接,2015(2):54-58.
[13]杨尚磊,林庆琳. A6N01铝合金焊接接头的微观组织与力学性能[J].中国有色金属学报,2012,22(10):2720-2725.
[14]尹志民,张爱琼,王炎金. 6005A铝合金型材焊接接头组织与性能[J].轻合金加工技术,2001(1):32-34.