Stabilization of the vapor capillary by additional intensity maxima along the beam axis

通过沿光束轴的附加强度最大值来稳定蒸气毛细管

• 批准号: 423364400
• 负责人: Professor Dr.-Ing. Peer Woizeschke, since 10/2021
• 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: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/423364400?language=en
• 关键词: Stabilization; vapor; capillary; additional; intensity

Deep penetration laser beam welding offers the possibility of producing welds with a high aspect ratio (great depth with small width) with comparatively low heat input into the component. The laser radiation can penetrate deep into the material through the vapor capillary (keyhole). By varying the energy input into the vapor capillary, the dynamic process behavior can be significantly influenced. The aim of this research project is to increase the welding depth in deep penetration laser welding while at the same time reducing the formation of pores and spatter through targeted optical design with otherwise constant process and system parameters. The challenge lies in the fact that the keyhole depth for given process parameters in laser deep penetration welding is usually limited by the reduced intensity at the capillary bottom. The project is based on the assumption that an increase of the achievable capillary depth as well as a stabilization of the capillary dynamics can be achieved by a modification of the energy input in the form of a suitable axial beam shaping.

激光深熔焊接提供了以相对较低的热输入产生高深宽比(大深度、小宽度)的焊缝的可能性。激光辐射可以通过蒸气毛细管(小孔)深入材料。通过改变输入到蒸汽毛细管的能量，可以显著影响动态过程行为。本研究项目的目的是在工艺和系统参数保持不变的情况下，通过有针对性的光学设计来增加深熔激光焊接的焊接深度，同时减少气孔和飞溅的形成。挑战在于，在激光深熔焊接中，对于给定的工艺参数，小孔深度通常受到毛细管底强度降低的限制。该项目基于这样的假设，即通过以适当的轴向波束整形的形式修改能量输入，可以实现可实现的毛细深度的增加以及毛细动态的稳定。