中国激光, 2020, 47 (6): 0602004, 网络出版: 2020-06-03   

基于可视化观察的光纤激光深熔焊接羽辉形成原因分析 下载: 911次

Analysis of Plume Formation Reasons in Laser Deep Penetration Welding Based on Visual Observation
作者单位
北京工业大学激光工程研究院高功率及超快激光先进制造实验室, 北京 100124
摘要
采用高速摄像仪观察了光纤激光深熔焊接羽辉的动态行为,分析了羽辉的形成原因。结果表明:羽辉可分为底部周期性摆动部分和类似于激光束聚焦形态的狭长形部分;当小孔前壁上激光致蒸发蒸气靠近小孔口时,底部周期性摆动羽辉的摆动角度最大,反之,底部周期性摆动羽辉的摆动角度最小;狭长形羽辉的强度随着离焦量的增加(或深熔小孔口直径的增大)而增大。进一步分析表明:底部周期性摆动羽辉的形成与小孔前壁表面激光致蒸发蒸气的喷发有关;底部摆动羽辉的喷发过程中存在大量微粒;狭长形羽辉的形成与底部摆动羽辉沿光束方向喷发时携带的微粒进入光束内、受激光束加热发光有关。
Abstract
Herein, the dynamic characteristics of the laser deep penetration welding plume were observed using high-speed camera, and plume formation reasons were analyzed. Results show that plume was divided into the periodic oscillating plume at the bottom and narrow plume, which was similar to a laser-focused form. When laser-induced evaporation steam on the front wall of the keyhole was close to the keyhole orifice, the swinging angle of the periodic swing plume at the bottom was the largest, whereas that of the narrow plume was smallest. Moreover, the intensity of the narrow plume increased with increasing defocusing amount (or the diameter of the keyhole in deep penetration). Further analysis showed that the formation of the periodic oscillating plume at the bottom was related to the steam generated from laser-induced evaporation on the front wall of the keyhole, and a large number of particles were observed in the eruption process of the bottom-oscillating plume. The formation of the narrow plume was related to the particles in the plume entering the beam and being heated by the laser beam.

韩雪, 赵宇, 邹江林, 肖荣诗, 赵乐. 基于可视化观察的光纤激光深熔焊接羽辉形成原因分析[J]. 中国激光, 2020, 47(6): 0602004. Han Xue, Zhao Yu, Zou Jianglin, Xiao Rongshi, Zhao Le. Analysis of Plume Formation Reasons in Laser Deep Penetration Welding Based on Visual Observation[J]. Chinese Journal of Lasers, 2020, 47(6): 0602004.

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