Power density effect on the laser beam-induced eruption of spatters in fiber laser keyhole welding

IF 5 2区 物理与天体物理 Q1 OPTICS
Jianglin Zou, Baoqi Zhu, Gaolei Zhang, Shihui Guo, Rongshi Xiao
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引用次数: 14

Abstract

Violent eruption of spatters is one of the major problems restricting fiber laser keyhole welding technology development. In this study, the fiber laser power density variation was attained by altering the laser power and laser spot diameter for analyzing its impact on the eruption of spatters. The severity of spatters’ eruption can be indicated by the number of spatters and the mass loss of the weld seam. The correlation between the number of spatters and laser power density can be positive (if the latter is adjusted by changing the laser power) or negative (if the laser power density is varied by changing the laser spot diameter). When the latter diameter is changed, it has a strong impact on the vapor induced by the laser on the front keyhole wall (FKW), the FKW inclination angle, and the molten pool surface tension. The number of spatters also positively correlates with the laser-induced vapor on the FKW or the molten pool width and negatively correlates with the FKW inclination angle. Reducing the laser spot diameter can increase the laser power density, enhancing the welding process stability and suppressing the eruption of spatters to a certain extent.

功率密度对光纤激光锁眼焊接中激光束诱导飞溅物爆发的影响
飞溅物的剧烈喷发是制约光纤激光锁孔焊接技术发展的主要问题之一。本研究通过改变激光功率和光斑直径得到光纤激光功率密度的变化,分析其对溅射爆发的影响。飞溅物爆发的严重程度可以通过飞溅物的数量和焊缝的质量损失来表示。溅射数与激光功率密度之间的相关性可以是正的(如果后者通过改变激光功率来调节)或负的(如果通过改变激光光斑直径来改变激光功率密度)。当后者直径改变时,对激光在前锁孔壁(FKW)上诱导的蒸汽、FKW倾角和熔池表面张力有较强的影响。溅射数还与激光诱导的熔池宽度或熔池上的蒸汽量呈正相关,与熔池倾角呈负相关。减小激光光斑直径可以提高激光功率密度,提高焊接过程的稳定性,在一定程度上抑制飞溅物的爆发。
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来源期刊
CiteScore
8.50
自引率
10.00%
发文量
1060
审稿时长
3.4 months
期刊介绍: Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems
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