摘要
目的提高紫铜激光焊接接头的力学性能,并分析激光工艺参数对焊缝外观及焊缝微观组织的影响规律。方法分别对蓝光半导体激光与近红外光纤激光焊接紫铜的工艺参数进行优化设计,采用光学显微镜观察焊缝的外观形貌,采用拉力机测试焊缝的抗拉强度,采用金相显微镜观察和分析焊缝的微观组织。结果当采用近红外光纤激光进行焊接时,功率为2000 W,焊接速度为20 mm/s,焊缝抗拉强度为156 MPa。当采用蓝光半导体激光进行焊接时,功率为500 W,焊接速度为20 mm/s,焊缝抗拉强度为246 MPa,达到母材抗拉强度的80%。结论由于铜对蓝光波长的吸收率较高,当采用蓝光半导体激光进行焊接时,热量输入较低,焊缝的变形相对较小,并且焊缝中心各个方向上的温度梯度相同,容易形成等轴晶,有利于力学性能的提高。
The work aims to improve the mechanical properties of red copper laser welded joint,and analyze the effects of laser process parameters on appearance and microstructure of weld.The process parameters of welding red copper by blue diode laser and near infrared fiber laser were optimized.The appearance of the weld was tested by microscope,the tensile strength of the weld was tested by tensile machine,and the microstructure of the weld was tested by metallographic microscope.When welding with near infrared laser,the power was 2000 W,the welding speed was 20 mm/s,and the tensile strength of weld was 156 MPa.When welding with diode laser,the power was 500 W,the welding speed was 20 mm/s,and the tensile strength of weld was 246 MPa,reaching 80%of the tensile strength of the base metal.Due to the high absorption rate of copper to blue ray wavelength,when welding with blue diode laser,the overall heat input is low,the deformation of weld was low relatively,and the temperature gradient in each direction of the weld center is the same,which is likely to form equiaxed crystals.It is conducive to the improvement of mechanical properties.
作者
李志敏
刘志强
LI Zhi-min;LIU Zhi-qiang(Xuchang Electric Vocational College,Henan Xuchang 461000,China;Xuchang Vocational and Technical College,Henan Xuchang 461000,China)
出处
《精密成形工程》
北大核心
2022年第9期142-148,共7页
Journal of Netshape Forming Engineering
关键词
紫铜激光焊接
工艺参数优化
对比研究
抗拉强度
微观组织
laser welding of red copper
optimization of process parameters
comparative study
tensile strength
microstructure
