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首页> 外文期刊>Journal of Laser Applications >Effect of atmosphere above specimen on welding results during remote welding
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Effect of atmosphere above specimen on welding results during remote welding

机译：标本上方的气氛对远距离焊接过程中焊接结果的影响

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Remote welding has already been applied in the automobile industry [ S. Ream, Proceedings of the 69th Laser Materials Processing Conference, Tokyo, Japan, 2007, pp. 1–14 : M. H. Rhee et al., Proceedings of the 68th Laser Materials Processing Conference, Osaka, Japan, 2007, pp. 141–146 ), owing to many advantages. The authors revealed that the weld bead changed from full to partial penetration during remote welding of a steel sheet at the focal position without shielding gas ( S. Oiwa et al., Proceedings of the Eighth International Welding Symposium, Kyoto, Japan, 2008, p. 36 : S. Oiwa et al., Proceedings of LAMP2009, Kobe, Japan, 2009, pp. 9–128 ]. It was attributed to the phenomena that a laser-induced plume ascended high and an incident laser beam was apparently refracted and defocused by its interaction to the tall plume. It was also considered that the interaction zone between the plume and the laser beam above the specimen was heated spatially and consequently, its refractive index distribution affected the beam shape and focusing conditions. In this study, therefore, the laser-induced plume and low refractive index zones above the specimen during laser welding using focusing optics of long focal distance were simultaneously observed with high-speed video cameras and a Michelson interferometer, respectively. As a result, it was confirmed that the interaction zones with small refractive index values ascended high together with the growth of a plume and exerted a great effect on welding results in the atmosphere without a fan or shielding gas flow. Laser welding using a fan was also confirmed to be beneficial to the production of a stable penetration weld by suppressing the rise of a plume and a zone with low refractive index values. Furthermore, it was found that the refractive index distribution inside the plume and the peripheral atmosphere had such an inclination as to decrease their values toward the beam central axis.
机译：远程焊接已经在汽车工业中应用[S. Ream，第69届激光材料加工会议论文集，日本东京，2007年，第1-14页：MH Rhee等人，第68届激光材料加工会议论文集，日本大阪，2007年，第141-146页）。作者发现，在不使用保护气体的情况下，在焦点位置进行钢板的远距离焊接时，焊缝从完全熔深变为部分熔深（S. Oiwa等人，《第八届国际焊接研讨会论文集》，日本京都，2008，p。 。36：S. Oiwa等人，《 LAMP2009会议录》，日本神户，2009年，第9–128页]，这归因于以下现象：激光诱发的羽流上升得很高，而入射激光束显然被折射并由于它与高烟羽之间的相互作用而散焦，也被认为烟羽与标本上方的激光束之间的相互作用区域在空间上受到了加热，因此，其折射率分布影响了光束的形状和聚焦条件。 ，同时使用高速摄像机和迈克尔逊干涉仪，同时观察了使用长焦距聚焦光学器件在激光焊接过程中样品上方的激光诱导羽流和低折射率区域分别。结果，证实了具有小的折射率值的相互作用区域随着羽状物的生长而升高得更高，并且在没有风扇或保护气流的气氛中对焊接结果产生了很大的影响。还证实了使用风扇的激光焊接通过抑制羽流和具有低折射率值的区域的上升，有利于稳定焊缝的生产。此外，发现烟羽和周围大气内部的折射率分布具有朝向光束中心轴减小其值的倾向。

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