Weld pool oscillation frequency in pulsed gas tungsten arc welding with varying weld penetration

doi:10.1109/CoASE.2015.7294111

	Weld pool oscillation frequency in pulsed gas tungsten arc welding with varying weld penetration
	Shi, Yu; Zhang, Gang; Li, Chunkai; Gu, Yufen; Fan, Ding
	2015-10-07
会议日期	August 24, 2015 - August 28, 2015
会议地点	Gothenburg, Sweden
关键词	Gas metal arc welding Gas welding High speed cameras Image processing Intelligent robots Robot applications Robotics Tungsten Complete joint penetrations GTAW Image processing algorithm Laser vision Oscillation frequency Pulsed gas tungsten arc welding Weld penetrations Weld pool
卷号	2015-October
DOI	10.1109/CoASE.2015.7294111
页码	401-406
英文摘要	Control of weld joint penetration is a fundamental issue in intelligentizing the automatic robotic welding to a level comparable with skilled human welders. The oscillation of the weld pool has been found to be closely related to the weld penetration but existing technologies that are based on fluctuation in arc voltage or arc length lack the fundamental to monitor the weld pool oscillation accurately. In this paper, an improved laser vision based measurement system is proposed to capture the reflected laser lines to accurately monitor its oscillation. In this novel system for surface oscillation monitoring, a low-power laser pattern, five lines, is projected onto the specular weld pool surface and the reflection is intercepted by a high speed camera. By observing and analyzing the change of the reflected laser lines, it is found that the change of laser lines is periodic and has a strong relation with the pool oscillation. An image processing algorithm has also been proposed for extracting the oscillation frequency from the image sequence. Experiments verified that the proposed method can successfully measure the weld pool oscillation. Moreover, the oscillation modes with varying weld penetration during stationary and travelling welding process have been investigated and it is found that the oscillation mode is different under different welding process and weld penetration. Practically, during travelling welding process, the weld pool is oscillated from up to down. The oscillation frequency of partial penetration is higher than the complete joint penetration, along with an abrupt transition. The proposed sensing method thus established the foundation for a novel method to monitor and control the weld penetration in real-time for intelligent welding robots which may possess partial human intelligence to not only automate the welding process but also to intelligentize the automatic robotic welding process. © 2015 IEEE.
会议录	IEEE International Conference on Automation Science and Engineering
会议录出版者	IEEE Computer Society
语种	英语
ISSN号	21618070
内容类型	会议论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/117194]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
作者单位	State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Shi, Yu,Zhang, Gang,Li, Chunkai,et al. Weld pool oscillation frequency in pulsed gas tungsten arc welding with varying weld penetration[C]. 见:. Gothenburg, Sweden. August 24, 2015 - August 28, 2015.