摘要
木材摩擦焊接是一种具有发展前景的无胶胶合技术,为深化对木材焊接技术的认识,介绍了木材摩擦焊接技术的研究进展,探讨了焊接技术的发展方向。介绍了焊接原理、焊接效果、焊接影响因素及焊接性能改善的研究现状,讨论了摩擦焊接过程中温度与时间的函数模型,综述了焊接理论的有限元模型及焊接接头破坏机制的研究,结合木材焊接的特点及研究现状,提出了未来研究的设想。结果表明,除了木材种类、纹理方向、含水率及添加剂等共同影响因素外,对于不同的焊接方式,焊接效果的影响因素不尽相同,线性摩擦焊接的主要影响因素有施加压力、焊接频率和振幅、焊接时间、保压压力及保压时间等,旋转摩擦焊接的主要影响因素有木榫旋转速率、给进角度与速率、圆木榫直径与预留钻孔孔径的比值等。焊接界面的部分材料在水中会发生溶解,防水性能的缺陷限制了摩擦焊接技术在室外构件中的应用,焊接前的预处理能有效提高耐水性,部分添加剂的使用能起到改善焊接性能的作用。焊接传热模型有助于了解焊接过程发生的物理化学变化,有限元模型有助于从力学角度分析焊接构件的破坏机制。木材焊接技术可能向着结构构件工业化生产的方向发展,深入了解焊接构件的破坏机制、通过成熟工艺改善焊接效果、制造出便于工业化生产的焊接设备将会是未来研究的重点。
Wood friction welding is a promising non-adhesive gluing technology.In order to deeply understand this technology the research progress of the technology was introduced,and the development directions was discussed.The research status of welding principle,welding effect,welding factors and welding performance improvement were introduced.The function model of temperature and time in welding process was discussed.The finite element model and the research on the failure mechanism of welded joint were introduced.Combined with the characteristics and research status of wood welding,the future research ideas were proposed.The results showed that in addition to the common influencing factors such as wood type,texture direction,water content and additives,the influence factors were various from welding methods.The main factors of linear friction welding were applied pressure,welding frequency,amplitude,and welding time,etc.,while the factors of rotational friction welding were the rotation rate of the raft,the feeding angle,the velocity,the ratio of the diameter of the raft and the reserved borehole diameter,etc.Some materials of the welding interface would dissolve in water.The defects of waterproof performance limited the application of the technology in outdoor structures.Pretreatment and additives could effectively improve the welding performance.The heat transfer model helped to understand the physical and chemical changes that occurred in the welding process,as well as the finite element model helped to analyze the failure mechanism of welded components from the mechanical point of view.The technology may be developed in industrial production of structural components.It is the focus of future research to understand the failure mechanism of welded components,to improve the welding effect through mature processes,and to manufacture equipment for industrial production.
作者
王洁
靳慧
WANG Jie;JIN Hui(Jiangsu Key Laboratory of Engineering Mechanics,School of Civil Engineering,Southeast University,Nanjing 211189,Jiangsu,China)
出处
《西北林学院学报》
CSCD
北大核心
2019年第6期191-196,258,共7页
Journal of Northwest Forestry University
基金
国家重点研发计划资助项目(2017YFC0805100)
江苏省工程力学分析重点实验室开放课题资助项目(LEM16A10)
关键词
木材焊接
线性摩擦焊接
旋转摩擦焊接
焊接效果
有限元
wood welding
linear friction welding
rotary friction welding
welding effect
finite element
