基于结构激光反射的脉冲TIG焊熔池三维表面演化观测黄健康1何笑英.DOCVIP

基于结构激光反射的脉冲TIG焊熔池三维表面演化观测 黄健康1 何笑英1 扶剑锋2 石玗1 樊丁1 （1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室，甘肃 兰州 730050；2. 长沙众泰汽车工业有限公司，湖南 长沙 410100） 摘要：针对移动的脉冲TIG焊动态熔池表面复杂行为，提出基于结构激光反射视觉传感的方法对脉冲TIG焊动态熔池表面演化过程进行观测研究. 通过所搭建的视觉系统来采集网格激光在熔池表面反射的图像信息，在此基础上，对在不同的基值电流、峰值电流、占空比条件下的脉冲TIG焊的图像特征进行分析. 研究发现：在峰值电流阶段熔池的三维表面是向下凹的；在基值电流阶段时，TIG焊熔池三维表面是向上凸的，并可明显地观测到，激光网格的形态随时间也在变化，这表明在基值电流阶段，熔池三维表面仍在波动. 关键词：结构激光 脉冲TIG焊 熔池三维表面 观测 中图分类号：TG401 文献标识码：A Observe on the weld pool surface evolution of pulsed TIG welding based on structure lasers reflection HUANG Jian-kang1, HE Xiao-ying1, FU Jian-feng2, SHI Yu1, Fan Ding1 (1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou Univ. of Tech. ,Lanzhou 730050, China; 2. Changsha Zotye Auto Industry CO., Ltd, Changsha 410100, China Abstract: According to the complicated behaviors of motive TIG welding weld pool three-dimensional surface, the vision sensor method of structure lasers reflection for the evolution process of pulsed TIG welding dynamic weld pool surface was put forward. Using the implementation of vision system to record the video image of grid lasers which were reflected by weld pool surface. Based on that, the pulsed TIG welding images characteristics were analysed at the different base current, peak current, duty cycle. The results show that the weld pool three-dimensional surface is concave downward at the peak current stage. And at the base current stage, TIG welding weld pool three-dimensional surface is convex upward, and observing obviously the shape of lasers grid were changing with time as well. This revealed that weld pool three-dimensional surface occurred fluctuating. Key words: structure lasers；pulsed tungsten inert gas arc welding；weld pool three-dimensional surface；observation 收稿日期：基金项目：国家自然科学基金资助项目，兰州理工大学红柳青年项目(Q201202)作者简介：黄健康(1981-)，男，湖南邵东人，博士，副教授，硕士研究生导师，主要从事焊接过程检测与控制、焊接物理等相关方面的研究脉冲TIG(TIG-P)焊是一种高效、优质、节能的先进焊接方法，因而常用于薄壁工件的焊接，特别适合于铝、镁等轻金属的焊接[1]. 针对熔池表面信息的提取国内外众多学者对此展开了研究，P.