【摘 要】
：
A mathematical model was established to simulate the weld pool development and dynamic process in stationary laser-MIG hybrid welding. Surface tension and buoya
论文部分内容阅读
A mathematical model was established to simulate the weld pool development and dynamic process in stationary laser-MIG hybrid welding. Surface tension and buoyancy were considered to calculate liquid metal flow patter, moreover, typical phenomena of MIG welding, such as filler droplets impinging weld pool, electromagnetic force in the weld pool, and typical phenomena of laser beam welding, such as recoil pressure, Inverse Bremsstrahlung absorption, Fresnel absorption were all considered in the model. The laser beam and arc couple effect were introduced into this model by the plasma width during hybrid welding. The role of recoil pressure in the weld formation was discussed. Transient weld pool shape and complicated liquid metal velocity distribution from two kinds weld pool to an unified weld pool were calculated. The simulated weld bead geometry with consideration recoil pressure was in good agreement with experimental measurement.
其他文献
对大别山祝家铺辉石岩-辉长岩的U,Pb同位素研究表明,大别山碰撞后镁铁-超镁铁岩的低U,高Pb含量及低U/Pb的特征,可能是亏损软流圈地幔（DMM）或岩石圈地幔与下地壳之间相互作用的结果,而与地幔热柱（Plume）及深俯冲陆壳无关.发现祝家铺辉石岩-辉长岩的高207Pb/204Pb样品具有LOMU端元的特点,Pb,Sr和Nd同位素联合示踪显示祝家铺辉石岩-辉长岩的源区有古老富集岩石圈地幔（LOMU
结合深圳湾公路大桥实例 ,介绍依据《中华人民共和国招标投标法》进行该项目设计招标的组织和实施情况
Combined with the example of Shenzhen Bay Highway Bridge, this p
To achieve the satellite formation control and the succeed formation missions, we present a new stealthy method to determine the relative states between formati
To improve global control of disease and reduce global toxicity, a complex seed distribution pattern should be achieved with great accuracy during brachytherapy
文章通过对现有GIS中空间数据库系统模型的分析与比较,提出了一个适用于智能化空间决策支持系统(SDSS)的空间数据库系统模型。在该数据库系统模型中,通过在数据库上附加一层中间件来解决从空间对象模型到数据库存贮的映射问题,从而较好地实现了空间数据和属性数据的统一管理。
产于胶东玲珑金矿大开头矿段、47号支脉内的原生致密块金, 其重量超过29 kg, 按重量大于5 kg称超大型块金的标准, 命名为"超大玲珑". 在肉眼和显微尺度, "超大玲珑"及其毗邻
To realize the stabilization and the tracking of flight control for an air-breathing hypersonic cruise vehicle, the linearization of the longitudinal model unde
在以前工作的基础上, 进一步对所提出的自适应变分资料同化方法在表面海温(SST)资料同化进行了探讨, 并将其应用到实际的SST资料同化中. 利用一个湍流封闭混合层模式对LOTUS