Identification of the influence of mechanical vibrations on the solidification process during deep penetration welding

深熔焊过程中机械振动对凝固过程影响的识别

• 批准号: 267927324
• 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: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/267927324?language=en
• 关键词: Identification; influence; mechanical; vibrations; solidification

Mechanical vibrations can significantly influence the grain growth during solidification of liquid metals. This effect is used as a mechanical refinement method and is well established in casting technology. Using this method in deep penetration laser beam welding process within a frequency range of 0 Hz to 5 kHz has also shown a beneficial impact to the grain structure in the fusion zone. However, the main influencing factors and mechanisms behind this refinement effect are not completely understood in the case of the comparatively fast deep penetration laser beam welding. Within the scope of this research project this mechanisms and factors shall be determined by means of experimental investigations. The main assumption is that the refinement effect is more efficient for comparatively high frequencies and is mainly based on grain detachment due to the additional relative movement between the melt pool and the solidification front. Knowing the main influencing factors of this effect can provide a basis for the future development of efficient system technologies capable to produce a finer grain microstructure and hence improved weld seam properties, especially reducing the occurrence of hot-cracking.

在液态金属凝固过程中，机械振动会显著影响晶粒的生长。这种效应被用作机械细化方法，并在铸造技术中得到很好的应用。在0 Hz至5 kHz的频率范围内的深熔激光束焊接工艺中使用该方法也显示出对熔合区中的晶粒结构的有益影响。然而，这种细化效果背后的主要影响因素和机制并没有完全理解的情况下，相对较快的深熔激光束焊接。在本研究项目范围内，应通过实验研究确定这些机制和因素。主要的假设是，细化效果是更有效的相对较高的频率，主要是基于晶粒分离，由于额外的相对运动之间的熔池和凝固前沿。了解这种效应的主要影响因素可以为未来开发能够产生更细晶粒显微组织的有效系统技术提供基础，从而改善焊缝性能，特别是减少热裂纹的发生。

项目成果

Laser Deep Penetration Welding of an Aluminum Alloy with Simultaneously Applied Vibrations

同时施加振动的铝合金激光深熔焊

• DOI: 10.1007/s40516-016-0032-9
• 发表时间: 2017
• 期刊: Lasers in Manufacturing and Materials Processing
• 作者: Woizeschke;Nicolay;Vollertsen
• 通讯作者: Vollertsen

Reduction of hot cracking susceptibility during laser welding of aluminum by vibrations

• DOI: 10.1007/s40194-018-00680-2
• 发表时间: 2018-11
• 期刊: Welding in the World
• 影响因子: 2.1
• 作者: T. Radel;P. Woizeschke

Mechanical manipulation of solidification during laser beam welding of aluminum

铝激光束焊接过程中凝固的机械控制

• DOI: 10.1007/s40194-017-0530-1
• 发表时间: 2018
• 期刊: Welding in the World
• 影响因子: 2.1