Development and application of knowledge-based software for railcar frame welding process
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ORIGINAL ARTICLE
Development and application of knowledge-based software for railcar frame welding process Yulian Zhang 1 & Yanhong Wei 1 & Jiong Pu 1 & Xingnan Yuan 2 Received: 15 May 2020 / Accepted: 4 November 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract As main welded components of the rail vehicle, the railcar frames have specific needs in preparing a suitable welding document for each welded joint to guide the welding process during the manufacturing process. In this paper, the expert system and database technology are introduced into the field of rail vehicle welding process preparation, and a knowledge-based software for railcar frame welding process is developed. This system could maintain the normal operation of the enterprise rail welding system based on knowledge base and database. The numerous paper-based and fragmented electronic documents are stored in a unified format within the system’s database, and a reasoning mechanism based on Rule-Based Reasoning (RBR) and Case-Based Reasoning (CBR) is designed to intelligently match the welding procedure specification (WPS) and welding procedure qualification report (WPQR) online. Furthermore, the system supports multiple departments and personnel by integrating the function of workflow to carry out the WPS prepare and review process. Thousands of welded joints with various structures and complex positions in the same vehicle body can be aggregated into a welding summary table to reduce the repeated welding procedure qualifications (WPQ) of the same or similar welding joint. This method not only saves manpower and resources, but also ensures the accuracy of these process documents. In the end, the future development trend of this kind of application software is prospected. Keywords Rail vehicle . Welding procedure qualification (WPQ) . Welding expert system . Database system . Hybrid reasoning mechanism . Workflow system
1 Introduction As a kind of green transportation with large capacity and high efficiency, rail vehicle occupies an increasingly essential position in people’s lives. The railcar frame, mainly including underframes, side wall, end wall, and railcar roof, is a typical welded construction where there exists a large number of complex and proteiform welded structures so that the requirements of welding processes are diverse and reliable [1]. During the welding process, welding deformation caused by stress concentration will reduce the welding quality of welded joints and integral weldments. Furthermore, it will affect their
* Yanhong Wei [email protected] 1
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2
Nanjing Welding Intelligent Technology Co., Ltd, Nanjing 210000, China
in-service safety factor and service life. Hence, a welding procedure qualification report (WPQR) shall be prepared for every welded joint. High-quality welding process and welding procedure qualification (WPQ) are important measures to ensure the welding quality [2], whic
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