Simulation of the Backward Flow of the Melted Pool into the Laser Keyhole

来源 :稀有金属材料与工程 | 被引量 : 0次 | 上传用户:sven321
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
When laser beam is ceased,the melt metal flows downward to fill the keyhole during keyhole welding.Mathematical models and VOF(volume of fluid)techniques have been developed to study the refilling process.The simulation results show that the surface tension pressure plays more important role than the total pressure of fluid flow in the molten pool,and the violent interaction between liquid metal and keyhole air and whirlpool in the fluid flow influence the dimension of keyhole air region and the velocity of molten pool. The laser beam is ceased, the melt metal flows downward to fill the keyhole during keyhole welding. Mathematical models and VOF (volume of fluid) techniques have been developed to study the refilling process. The simulation results show that the surface tension pressure plays more important role than the total pressure of fluid flow in the molten pool, and the violent interaction between liquid metal and keyhole air and whirlpool in the fluid flow influence the dimension of keyhole air region and the velocity of molten pool.
其他文献
1938年春,在陪都重庆沙坪坝街上开有一家上海杂志公司,出版并销售一些世界文学名著及国内文坛佳作,每天从早到晚,门庭若市。提起这家书店的开办,得从徐悲鸿大师说起。  书店经理陈汝言,江苏太仓人。1937年的淞沪炮声,迫使他流亡到山城。他看到沙坪坝高等学府林立,学生上万,却无一家像样的书店,便决定开一家好书店及出版社。但经费从何而来呢?当时,支持他开书店的知名教授如胡小石等均度日维艰,爱莫能助。多亏
在高年级作文分层教学中,教师要把握教材编排特点,进行有效分层教学指导;在阅读教学中要渗透写作方法的指导,对每一个层次的学生提出不同的阅读要求;采用灵活多样的写作训练
期刊