A novel weld-pool-length monitoring method based on pixel analysis in plasma arc additive manufacturing

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外文摘要：The real-time monitoring of the weld pool dur-ing deposition is important for automatic control in plasma arc additive manufacturing.To obtain a high deposition accuracy,it is essential to maintain a stable weld pool size.In this study,a novel passive visual method is proposed to measure the weld pool length.Using the proposed method,the image quality was improved by designing a special visual system that employed an endoscope and a camera.It also includes pixel brightness-based and gradient-based algo-rithms that can adaptively detect feature points at the bound-ary when the weld pool geometry changes.This algorithm can also be applied to materials with different solidifica-tion characteristics.Calibration was performed to measure the real weld pool length in world coordinates,and outlier rejection was performed to increase the accuracy of the algo-rithm.Additionally,tests were carried out on the intersection component,and the results showed that the proposed method performed well in tracking the changing weld pool length and was applicable to the real-time monitoring of different types of materials.

外文关键词：

Plasma arc additive manufacturing(PAAM)Weld pool geometryGradient analysisReal-time detection

作者：

Bao-Ri Zhang、Yong-Hua Shi

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作者单位：

Bionic Robot Research Department,Ji Hua Laboratory,Foshan 528200,Guangdong,People's Republic of China

Guangdong Provincial Engineering Research Center for Special Welding Technology and Equipment,School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,People's Republic of China

基金：

China Scholarship Council and Basic and Applied Basic Research Foundation of Guangdong ProvinceCranfield UniversityJi Hua Laboratory

项目编号：

2022A1515110733

出版年：

2024

DOI：

10.1007/s40436-023-00466-w

先进制造进展(英文版)

ISSN：

年,卷(期)：2024.12(2)

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