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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >WELD PENETRATION AND PHENOMENA IN 10 KW FIBER LASER WELDING
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WELD PENETRATION AND PHENOMENA IN 10 KW FIBER LASER WELDING

机译：10 kW光纤激光焊接中的焊接渗透和现象

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A high-power fiber laser can produce an ultra-high peak power density of MW/mm{sup}2 level corresponding to a focused electron beam, and is promising as one of the desirable heat sources for high-speed and deep-penetration welding. This research was undertaken with the objective of obtaining a fundamental knowledge of 10 kW high-power fiber laser welding on Type 304 stainless steel plates in Ar shielding gas. The fiber laser-induced plume behavior was firstly observed and spectroscopic analyses of plumes were made. It was found that the plume was in a weakly ionized state and grew up periodically in about kHz cycles by 10 kW fiber laser. However, the weakly ionized plume had a slight interaction with the fiber laser beam of 1.09 μm wavelength. Subsequently, laser absorption was measured under various power densities. It was confirmed that the absorption increased to a great extent according to the variation from heat-conduction type welding to keyhole-type welding due to the increase in the laser power density. The effects of laser power and its density on weld penetration were clarified, and the formation mechanisms of welding defects were invetigated by high-speed video cameras. 10 kW laser power could produce deep weld penetration of more than 20 mm. The laser power and its density exerted a remarkable effect on the increase in weld penetration at lower and higher welding speeds, respectively. As for welding defects, it was found that underfilling with spatters was induced by strong shear force accompanying by the laser-induced plume, and humming was caused by not only the surface tension due to narrow bead width but also the backward melt flow.
机译：高功率光纤激光器可以产生MW /毫米{SUP}对应于聚焦电子束2水平，超高峰值功率密度，并有希望作为对期望热源用于高速和深熔焊接一个。这项研究是与物镜获得10千瓦的高功率光纤激光焊接于304型AR保护气体中的不锈钢板的一个基本的知识进行的。光纤激光诱导羽行为首先观察和羽流的分光分析均制成。结果发现，在羽流是在弱离子化的状态，并在大约10千瓦光纤激光器千赫的周期周期性地长大。然而，弱离子化的羽流曾与1.09微米波长的光纤激光束的轻微的相互作用。随后，激光吸收是在各种功率密度测量。据证实，吸收根据从热传导型的焊接来锁孔型焊接的变化增加在很大程度上归因于激光功率密度的增加。激光功率及其对焊接熔深密度的影响进行了澄清，和焊接缺陷的形成机制，通过高速视频摄像机invetigated。 10千瓦功率的激光可产生超过20毫米深的焊缝熔深。激光功率和其密度施加于在较低和较高的焊接速度的增加在焊接渗透的显着的效果，分别。至于焊接缺陷，人们发现，用飞溅底部填充诱导由激光诱导的羽伴随强剪切力，和嗡嗡通过不仅表面张力由于窄的珠宽度也是向后熔体流动引起的。

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