Study on the influence of side assisting gas on energy loss during CO2 laser welding based on 3D reconstruction
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- 作者：Dawei Sun ; Yan Cai ; Fang Li ; Xueming Hua
- 关键词：Laser welding ; Plasma ; 3D reconstruction ; Energy loss
- 刊名：The International Journal of Advanced Manufacturing Technology
- 出版年：2016
- 出版时间：October 2016
- 年：2016
- 卷：86
- 期：9-12
- 页码：3417-3426
- 全文大小：1,854 KB
- 刊物类别：Engineering
- 刊物主题：Industrial and Production Engineering
Production and Logistics
Mechanical Engineering
Computer-Aided Engineering and Design - 出版者：Springer London
- ISSN：1433-3015
- 卷排序：86
文摘
It is essential to acquire the electron temperature distribution of plasma plume to determine the laser energy loss caused by laser-induced plasma. In this paper, a set of synchronous high-speed cameras were positioned in different angles to obtain plasma images during CO2 laser welding process shielded by He-Ar mixed gas. The absorption coefficient and refractive index of incident laser was calculated based on the 3D distribution of laser-induced plasma. The results indicated that the temperature field of plasma core region was nonuniform while the temperature distribution was relatively smooth and uniform for plasma periphery portion. It was found that the shielding gas affected the 3D distribution of plasma, as well as the energy interaction between laser and base material. Laser energy loss caused by plasma increased with argon percentage in the shielding gas. Relatively, laser energy loss caused by refraction is slightly higher than that caused by absorption.