Influence of the spatial intensity distribution on keyhole stability during high power laser welding

高功率激光焊接过程中空间强度分布对小孔稳定性的影响

• 批准号: 186992358
• 负责人: Professor Dr.-Ing. Frank Vollertsen
• 金额: --
• 依托单位: BIAS - Bremer Institut für Angewandte Strahltechnik GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/186992358?language=en
• 关键词: Influence; spatial; intensity; distribution; keyhole

Beams of modern laser beam sources used for deep penetration welding show different spatial intensity distributions in the focal layer. Experimental observations show that using different laser beam sources affect the dynamics of the welding process. Formation of process pores during laser deep penetration with high aspect ratios depends significantly on process dynamics, especially on the keyhole dynamics. It is assumed that also the formation of process pores can be influenced by the spatial laser intensity distribution. Therefore, the aim of the project is to improve the understanding of the correlations between keyhole dynamics and the spatial laser intensity distribution and to describe the correlation in an analytical model. With the help of the analytical model an optimized spatial laser intensity distribution shall be calculated to improve keyhole stability. An optical system shall be built that allows shaping the laser beam to the previously analytically calculated, optimized spatial intensity distribution to minimize process pore formation during laser deep penetration welding with high aspect ratios.

现代深熔焊接用激光束源的光束在焦点层表现出不同的空间强度分布。实验观察表明，采用不同的激光束源会影响焊接过程的动力学特性。高纵横比激光深侵彻过程中工艺孔的形成很大程度上取决于工艺动力学，尤其是锁孔动力学。假设激光强度的空间分布也会影响工艺孔的形成。因此，该项目的目的是提高对钥匙孔动力学与空间激光强度分布之间相关性的理解，并在分析模型中描述这种相关性。利用该解析模型，计算出优化后的激光空间强度分布，以提高锁孔稳定性。在高纵横比激光深熔焊接过程中，应建立一个光学系统，使激光束的形状符合先前分析计算的优化空间强度分布，以最大限度地减少工艺孔的形成。

项目成果

Modeling keyhole oscillations during laser deep penetration welding at different spatial laser intensity distributions

不同空间激光强度分布下激光深熔焊接过程中小孔振荡的建模

• DOI: 10.1007/s11740-014-0594-3
• 发表时间: 2015
• 期刊: Production Engineering
• 作者: Vollertsen