...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Numerical simulation of weld pool geometry in laser beam welding
【24h】

Numerical simulation of weld pool geometry in laser beam welding

机译：激光束焊接中熔池几何形状的数值模拟

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A linear correlation between the depth and the length of the weld pool is found in laser beam welding experiments with varied Laser beam power and constant welding speed. On the other hand, the weld pool length changes only slightly with increased welding speed and constant laser beam power. The existing analytical and numerical models fail to explain these dependences. The observed effects are essentially conditioned by the fluid how in the weld pool caused by the thermocapillary effect, by the friction forces of the metal vapour passing through the capillary and by the convexity of weld pool and fusion zone caused by thermal expansion of the weld pool and the joined workpieces. In order to predict the weld pool length more accurately the model developed by Sudnik et al in 1996 is enlarged by the heat transport produced by the recirculating how in radial sections of the weld pool. Verification of the model for 16MnCr5 steel with sheet thicknesses of 2 and 6 mm shows that it is suitable for predicting the weld pool geometry and for analysing the thermodynamics of the process. In order to gain a better understanding of the structure of heat transport in the weld pool, the different modes of transport are compared in respect of their contribution to the depth-to-length ratio of the weld pool. A calculation of the weld pool length for welding speeds of 1-8 m min(-1) with a laser beam power of 2.5 kW shows that the relative contributions of the transport modes are as follows. Approximately 50-90% of the weld pool length (increasing with welding speed) results from conductive and translatory heat transport (with the fusion zone convexity contributing approximately 20-30%). The remaining 50-10% of the weld pool length (decreasing with welding speed) result from convective heat transport. The model predicts the shoulder in the weld pool trough. It also explains the change in the weld pool length by the effect of the gap width, by the transition from through welding to penetration welding and by improvements in beam quality. [References: 29]
机译：在变化的激光束功率和恒定的焊接速度的激光束焊接实验中，发现熔池深度和长度之间存在线性关系。另一方面，随着焊接速度的增加和恒定的激光束功率，熔池长度仅略有变化。现有的分析和数值模型无法解释这些依赖性。观察到的效果主要受流体的影响，这些流体是由热毛细作用引起的，在焊池中的状态如何，通过毛细管的金属蒸气的摩擦力，以及由焊池的热膨胀引起的焊池和熔合区的凸度和连接的工件。为了更准确地预测焊缝长度，Sudnik等人在1996年开发的模型通过在焊缝径向截面中的循环方式产生的热传递进行了扩展。对薄板厚度为2和6 mm的16MnCr5钢模型的验证表明，它适用于预测焊缝几何形状和分析过程的热力学。为了更好地了解熔池中的热传输结构，比较了不同的传输方式对熔池深长比的影响。以2.5 kW的激光束功率对1-8 m min（-1）的焊接速度进行的熔池长度计算表明，传输模式的相对贡献如下。大约50-90％的熔池长度（随着焊接速度的增加而增加）是由传导和平移的热传递引起的（熔化区的凸度贡献了大约20-30％）。剩余的50-10％的熔池长度（随焊接速度的增加而降低）是由对流传热引起的。该模型预测焊缝槽中的肩部。它也解释了由于间隙宽度的影响，从直通焊到深熔焊的过渡以及光束质量的改善，熔池长度的变化。 [参考：29]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号