激光诱导羽流对16kw圆盘激光不锈钢锁孔焊接性能的影响

IF 1.7 4区 工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yoshiaki Kurita, Yuji Sato, Shumpei Fujio, Masami Mizutani, Masahiro Tsukamoto
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引用次数: 0

摘要

飞溅是激光焊接的缺陷因素之一。为了实现高质量的激光焊接,需要对溅射减少机理进行阐明。在我们之前的研究中,通过对不同环境压力条件下的锁孔和熔池的观察,阐明了熔池和锁孔波动对溅射产生的影响。然而,造成熔池和锁孔不稳定的主要原因尚未明确。认为激光与羽流的相互作用可能是造成这些不稳定性的原因。因此,在本研究中,我们主要研究激光照射产生的羽流。在不同的环境压力下,观察了激光焊接过程中羽流的动力学和激光的衰减。根据这些观察结果,阐明了羽流对激光焊接不稳定性的影响。将SS304固定在真空室中,用输出功率为6kw的盘式激光器对试样进行扫射,形成焊头。同时,用纹影法观察了羽流的行为,用探针激光器测量了激光的衰减。结果,观测到了金属蒸汽喷射,这是一种周期性的羽流喷射。探测激光的衰减随大气压力的增加而增加。结果表明,常压下金属蒸汽射流的频繁产生导致激光热输入的不稳定,从而导致锁孔和熔池的不稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of the laser-induced plume on welding behavior in keyhole welding for stainless steel using a 16 kW disk laser
The spatter is one of the defect factors for laser welding. For high-quality laser welding, the elucidation of the spatter reduction mechanism is required. In our previous study, it was elucidated that the molten pool and keyhole fluctuation contribute to spatter generation from the observation of the keyhole and molten pool under different ambient pressure conditions. However, the main cause of the instability of the molten pool and keyhole has not been clarified. It is considered that the interaction between the laser and plume might cause these instabilities. Therefore, in this study, we focused on the plume generated by laser irradiation. The dynamics of the plume during laser welding and the attenuation of the laser were observed under different ambient pressures. According to these observations, the effect of the plume on instability in laser welding was elucidated. The SS304 was fixed in the vacuum chamber, and the disk laser with an output power of 6 kW swept on the sample to form the weld bead. At the same time, the plume behavior was observed by the Schlieren method, and the attenuation of the laser was measured using a probe laser. As a result, the metal vapor jet, which is a periodical plume ejection, was observed. The attenuation of the probe laser increased with increasing atmospheric pressure. These results suggest that the frequent generation of the metal vapor jet under atmospheric pressure caused instability in the heat input of the laser, which caused instability in the keyhole and molten pool.
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来源期刊
CiteScore
3.60
自引率
9.50%
发文量
125
审稿时长
>12 weeks
期刊介绍: The Journal of Laser Applications (JLA) is the scientific platform of the Laser Institute of America (LIA) and is published in cooperation with AIP Publishing. The high-quality articles cover a broad range from fundamental and applied research and development to industrial applications. Therefore, JLA is a reflection of the state-of-R&D in photonic production, sensing and measurement as well as Laser safety. The following international and well known first-class scientists serve as allocated Editors in 9 new categories: High Precision Materials Processing with Ultrafast Lasers Laser Additive Manufacturing High Power Materials Processing with High Brightness Lasers Emerging Applications of Laser Technologies in High-performance/Multi-function Materials and Structures Surface Modification Lasers in Nanomanufacturing / Nanophotonics & Thin Film Technology Spectroscopy / Imaging / Diagnostics / Measurements Laser Systems and Markets Medical Applications & Safety Thermal Transportation Nanomaterials and Nanoprocessing Laser applications in Microelectronics.
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