Development of resistance spot welding technology applying multi-stage adaptive control for narrow pitch spot welding of high strength steel sheets

Q4 Materials Science Welding International Pub Date : 2023-06-28 DOI:10.1080/09507116.2023.2228036

Chikaumi Sawanishi, Hiroshi Matsuda, Yasuaki Okita, Rinsei Ikeda

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Abstract

In order to expand the application of high strength steel sheets to automotive bodies, stabilizing nugget diameter of resistance spot welds is required in the presence of several industrial disturbances. This study aims to ensure the nugget diameter of high strength steel sheets regardless weld spacing by utilizing adaptive control technology based on real-time feedback of heat quantity. Short weld spacing leads to expulsion from the sheet surface applying conventional adaptive control welding for mild steel sheets, whereas decrease in nugget diameter due to reduction of effective welding current for high strength steel sheets. On the other hand, two-stage adaptive control method enables to ensure nugget diameter regardless of steel strength even with 10 mm weld spacing, in which heat quantity was controlled independently in each stage of welding. The mechanism of these phenomena was revealed by verifying the influence of physical properties of steel and welding current pattern on the shunting phenomena using numerical simulation.

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高强度薄板窄距点焊多级自适应控制电阻点焊技术的发展

为了扩大高强度钢板在汽车车身上的应用，在多种工业扰动存在的情况下，需要稳定电阻点焊的熔核直径。本研究旨在利用基于实时热量反馈的自适应控制技术，在不考虑焊缝间距的情况下保证高强度钢板的熔核直径。低碳钢采用常规自适应控制焊接时，焊缝间距过短会导致熔核从薄板表面排出，而高强度钢板采用常规自适应控制焊接时，由于有效焊接电流的减小导致熔核直径减小。另一方面，采用两阶段自适应控制方法，即使焊接间距为10 mm，也能在不考虑钢强度的情况下保证熔核直径，焊接各阶段的热量都是独立控制的。通过数值模拟验证了钢的物理性能和焊接电流模式对分流现象的影响，揭示了这些现象的机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Welding International Materials Science-Metals and Alloys

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0.70

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期刊介绍： Welding International provides comprehensive English translations of complete articles, selected from major international welding journals, including: Journal of Japan Welding Society - Japan Journal of Light Metal Welding and Construction - Japan Przeglad Spawalnictwa - Poland Quarterly Journal of Japan Welding Society - Japan Revista de Metalurgia - Spain Rivista Italiana della Saldatura - Italy Soldagem & Inspeção - Brazil Svarochnoe Proizvodstvo - Russia Welding International is a well-established and widely respected journal and the translators are carefully chosen with each issue containing a balanced selection of between 15 and 20 articles. The articles cover research techniques, equipment and process developments, applications and material and are not available elsewhere in English. This journal provides a valuable and unique service for those needing to keep up-to-date on the latest developments in welding technology in non-English speaking countries.