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Skill Level Detection in Arc Welding towards an Assistance System for Workers

Published: 11 July 2022 Publication History

Abstract

Common post evaluation techniques (image based) in the welding industry imply several disadvantages interfering with further production pipeline optimization. The manufacturing processes are extended which increases time, costs and effort. The usage of an online assistance system supporting the welder through helpful information about the current welding quality could resolve these issues. Despite the simpler access to online generated data recorded with embedded (inside the arc welder) or attached inertial measurement units, common challenges like feature extraction and feature selection had to be mastered without losing sight of the decisive arc welding characteristics. Decoding and accentuating physical welding skills mathematically to an understandable data representation supporting the random forest classifier was the key task of this study. Smart arc welders recording 3D accelerometer, 3D gyroscope, voltage and current data streams in combination with supervised data recording sessions enabled a clean data acquisition. Additional features were determined building a 960-dimensional feature set. Concatenating a correlation matrix computation and a forward feature selection improved the balance of the model complexity and its generalization and led to an optimized feature set including 15 features. The final optimization provided an extensive grid search. The resulting model reflected the test welders’ expertise even more accurately than the expert and novice labels in the data validated from a welding expert. A quantitative evaluation reached a 72% F1 score and a 76% accuracy.

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  • (2023)Analyzing Arc Welding Techniques improves Skill Level Assessment in Industrial Manufacturing ProcessesProceedings of the 16th International Conference on PErvasive Technologies Related to Assistive Environments10.1145/3594806.3594822(177-186)Online publication date: 5-Jul-2023

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        cover image ACM Other conferences
        PETRA '22: Proceedings of the 15th International Conference on PErvasive Technologies Related to Assistive Environments
        June 2022
        704 pages
        ISBN:9781450396318
        DOI:10.1145/3529190
        Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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        Published: 11 July 2022

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        • (2023)Analyzing Arc Welding Techniques improves Skill Level Assessment in Industrial Manufacturing ProcessesProceedings of the 16th International Conference on PErvasive Technologies Related to Assistive Environments10.1145/3594806.3594822(177-186)Online publication date: 5-Jul-2023

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