摘要
为了减少铝合金激光焊接内部气孔,提升焊缝质量,采用摆动的光纤激光对6mm-5083铝合金锁底对接接头进行摆动激光-MIG复合焊接。研究了摆动激光束的频率、振幅对焊缝内部气孔数量和熔深的影响,并采用正交试验研究了激光功率、焊接速度、焊接电流、摆动频率对焊缝内部质量的影响,获取了最优参数,进而分析了最优参数下焊缝的微观组织及力学性能。试验结果表明,激光束摆动频率及振幅的提升均有助于消除气孔缺欠,各因素对气孔率的影响大小依次为光束摆动频率、焊接电流、焊接速度、激光功率,当采用功率6400W、焊接电流136A、焊接速度28mm/s、摆动频率240Hz、摆动振幅1 5mm的参数焊接6mm-5083铝合金时,焊缝内部无明显气孔,接头平均硬度为70.4HV,焊缝强度278MPa,达到母材91.9%。
In order to reduce the internal porosity and improve the quality of aluminum alloy weld seam, the wobbling fiber laser is performed on the 8 mm 5083 aluminum alloy locked bottom butt joint in laser-MIG hybrid welding.The influence of the weaving frequency and amplitude of the laser beam on the porosity and the penetration was studied.Orthogonal experiments were carried out to investigate the primary and secondary relations between the influence of laser power, welding speed, welding current and weaving frequency on the formation of weld porosity. The optimal parameters were obtained and the microstructure and mechanical properties of the weld joint under the optimal parameters were analyzed. The result shows that the laser beam swing frequency and amplitude are helpful to eliminate stomatal imperfections. The effect of the factors on the porosity is following by the laser weaving frequency, welding current, welding speed, laser power. To weld6 mm 5083 aluminum alloy by using the parameters, power 6800 W, welding current 136 A, welding speed 28 mm/s, weaving frequency 240 Hz, wobble amplitude 1.5 mm, we can get joint with no obvious pores, which average hardness is 70.4 HV, and the tensile strength of welded joints can reach 278 MPa, reaching 91.9% of the base metal.
作者
祁小勇
周京
刘硕夫
叶兵
王爱华
QI Xiaoyong;ZHOU Jing;LIU Shuofu;YE Bing;WANG Aihua(Hubei Key Laboratory of Laser Advanced Manufacture Technology, Wuhan 430223, China;Wuhan Huagong Laser Engineering Co., Ltd., Wuhan 430223, China;SAIC Volkswagen Automotive Co., Ltd., Shanghai 201800, China)
出处
《航空制造技术》
2019年第6期71-78,共8页
Aeronautical Manufacturing Technology
关键词
激光技术
摆动激光–MIG复合焊
5083
铝合金
摆动频率
摆动振幅
气孔
Laser technology
Wobbling laser-MIG hybrid welding
5083 aluminum alloy
Wobbling frequency
Wobbling amplitude
Porosity
