Study on arc characteristics under high-frequency sine wave pulse current and effect of weld appearance and microstructure of AISI444 ferritic stainless steel

Q4 Materials Science

Welding International Pub Date : 2023-06-03 DOI:10.1080/09507116.2023.2222550

Z. Dong, Yiwen Li, J. Miu, Z. Liu, Chen-Hsuan Chang, Yunlong Chang

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Abstract

Abstract Based on the principle of LC resonance, high-frequency sine wave pulse DC TIG welding (HFSWP DC TIG) was developed, and welding experiments were conducted on AISI444 ferritic stainless steel (FSS). The arc characteristics of HFSWP DC TIG and its effect on weld appearance and microstructure were studied theoretically and experimentally. The experimental results show that under the same conditions, compared with constant-current DC conventional arc welding (CAW), the arc pressure and arc thermal efficiency of HFSWP DC TIG are improved, and the weld penetration of the weld is increased by nearly two times. The weld microstructure is single-phase ferrite, and carbonitride, Laves phase, and phase are formed in the joint. In addition, according to the theoretical calculation of the pulse current waveform, the reason why the arc pressure of the high-frequency sine wave pulse current is increased compared with the constant-current DC and high-frequency square wave (triangular wave) pulse current is explained. The mechanism of arc shape and weld appearance change is described from the microscopic point of view, and the reason for the appearance of equiaxed grain in the weld is analyzed. HFSWP DC TIG provides a new idea for the improvement of high-frequency pulse technology.

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AISI444铁素体不锈钢高频正弦波脉冲电流电弧特性及焊缝外观和组织影响的研究

基于LC谐振原理，研制了高频正弦波脉冲直流TIG焊(HFSWP DC TIG)，并在AISI444铁素体不锈钢(FSS)上进行了焊接实验。从理论上和实验上研究了HFSWP直流TIG的电弧特性及其对焊缝形貌和显微组织的影响。实验结果表明，在相同条件下，与恒流直流常规电弧焊(CAW)相比，HFSWP直流TIG的电弧压力和电弧热效率都有所提高，焊缝的熔深提高了近两倍。焊缝组织为单相铁素体，在接头中形成碳氮化物、Laves相和Laves相。此外，根据脉冲电流波形的理论计算，解释了高频正弦波脉冲电流相对于恒流直流电和高频方波(三角波)脉冲电流弧压增大的原因。从微观角度阐述了电弧形状和焊缝形貌变化的机理，分析了焊缝中出现等轴晶粒的原因。HFSWP直流TIG为高频脉冲技术的改进提供了新的思路。

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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来源期刊

Welding International Materials Science-Metals and Alloys

CiteScore

0.70

自引率

0.00%

发文量

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.