摘要
为改善某整流器试样结构焊接工艺,对高温真空镍基合金钎焊过程展开了数值模拟研究,建立了高温钎焊真空炉中镍基合金钎料融化-润湿填充焊缝的流动模型。数值计算基于流体体积(volume of fluid,VOF)方法,综合考虑表面张力、重力、相变潜热等因素,采用层流模型求解得到了钎料随时间变化的流动行为。得到了固、液态钎料体积分布和温度场分布。虽然母材表面出现少部分钎料流失行为,并且在局部观察到有焊瘤的形成,但焊缝内钎料的整体填充效果良好,验证了钎焊工艺的钎料布置和温度控制的合理性。给出了关于时间和温度的钎料填充焊缝体积比的经验公式,为实际钎焊过程提供参考。
Based on the actual welding process of rectifier sample structure,the numerical simulation of high temperature vacuum nickel-based alloy brazing process was carried out,and the flow model of melting-wetting filling weld of nickel-based alloy filler metal in high temperature brazing vacuum furnace was established.The numerical calculation was based on the volume of fluid(VOF)method.Considering the factors such as surface tension,gravity,and latent heat of phase change,the laminar flow model was used to solve the flow behavior of the solder with time.The distribution of solid and liquid solder and the distribution of temperature field were calculated.The phenomenon of braze material loss and weld bead formation on the surface of the base material,along with a good filling effect of the braze material inside the weld seam,verifies the rationality of the arrangement of solder and temperature control in this brazing process.An empirical formula for the volume ratio of braze material filling the weld seam with respect to time and temperature has been provided,offering guidance for actual brazing processes.
作者
任凡
陶善聪
贺金雷
郑轩
周毅
REN Fan;TAO Shan-cong;HE Jin-lei;ZHENG Xuan;ZHOU Yi(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Hetu Intelligent Manufacturing Technology(Beijing)Co.,Ltd.,Beijing 100083,China)
出处
《科学技术与工程》
北大核心
2025年第17期7115-7121,共7页
Science Technology and Engineering
基金
国家自然科学基金(91952105)
中央高校基本科研业务费专项基金(30921011212)
江苏省六大人才峰会项目(2019-SZCY-005)。
关键词
钎焊
钎料流动
流体体积方法
表面张力
braze welding
solder flow
volume of fluid
surface tension
