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Feature Extraction and Dimensionality Reduction of Arc Sound under Typical Penetration Status in metal inert gas welding

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Chinese Journal of Mechanical Engineering 2012年第2期25卷 293-298页

作者： LIU Lijun LAN Hu ZHENG Hongyan JIAN Xiaoxia Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China School of Material Science ＆ Engineering Harbin University of Science and TechnologyHarbin 150080China Rongcheng College Harbin University of Science and TechnologyRongcheng 264300China

Arc sound is well known as the potential and available resource for monitoring and controlling of the weld penetration status,which is very important to the welding process quality control,so any attentions have been paid to the relationships between the arc sound and welding *** non-linear mapping models correlating the arc sound to welding parameters have been established with the help of neural ***,the research of utilizing arc sound to monitor and diagnose welding process is still in its infancy.A self-made real-time sensing system is applied to make a study of arc sound under typical penetration status,including partial penetration,unstable penetration,full penetration and excessive penetration,in metal inert-gas（MIG） flat tailored welding with spray *** sound is pretreated by using wavelet de-noising and short-time windowing technologies,and its characteristics,characterizing weld penetration status,of time-domain,frequency-domain,cepstrum-domain and geometric-domain are ***,high-dimensional eigenvector is constructed and feature-level parameters are successfully fused utilizing the concept of primary principal component analysis（PCA）.Ultimately,60-demensional eigenvector is replaced by the synthesis of 8-demensional vector,which achieves compression for feature space and provides technical supports for pattern classification of typical penetration status with the help of arc sound in MIG welding in the future.

关键词： metal inert gas welding penetration arc sound feature extraction dimensionality reduction

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A novel single wire indirect arc metal inert gas welding process operated in streaming mode

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China welding 2022年第2期31卷 39-44页

作者： Liu Aiguo Zhao Jing School of Materials Science and Engineering Shenyang Ligong UniversityShenyang 110159China Liaoning Horsen Automotive Parts Co.Ltd. Liaoyang 111000China

Dilution of a pad weld must be limited to a certain critical level to improve its wear and/or corrosion *** do that,a novel single wire indirect arc metal inert gas welding process operated in streaming mode was realized.A metal inert gas welding torch,arranged perpendicular to a substrate in vertical position,is fixed with an auxiliary tungsten electrode *** arc is ignited between a wire through the torch and the auxiliary *** substrate is not electrically *** welding current is set in the range of streaming mode.304 stainless steel was pad welded on Q235 substrates in vertical position by this *** were analyzed with optical *** ratios were measured with stereo light microscope and *** results show that,after eliminating interference of the massive torch setup,the dilution ratio of the pad weld with optimized parameters is 5.07%,much less than that with a metal inert gas welding process,which is 26.46%.The pad weld is bonded to the substrate without *** of the pad weld consist of columnar austenite and ferrite between the *** dilution ratio increases with increasing welding current or welding velocity,and decreases with increasing distance to the substrate.

关键词： pad welding dilution ratio indirect arc streaming mode vertical welding metal inert gas welding

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