Investigation of microstructure and mechanical properties of 304 stainless steel under high-frequency vibratory arc conditions

IF 6.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
Hongyan Zhao , Tao Lv , Yue Yu , Yian YAN , Jingzhang Zhang , Shujun Chen , Hongxiao Li
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Abstract

In traditional cross-coupled welding, the main arc swings with the polarity changes of the bypass arc, leading to uneven heat distribution and compromising the decoupling of heat and mass transfer. To address this issue, a new cross-coupled welding method based on high-frequency bypass arc was developed. When the bypass arc operates at a high frequency of over 20 kHz, the main arc does not significantly swing with the polarity shifts. Instead, it vibrates at a high frequency with a small amplitude. To verify whether this vibration behavior influences the molten pool flow and promotes grain refinement, a series of experiments were designed and conducted. The results showed that, under identical conditions, the weld width produced by cross-coupled welding with a 50 Hz bypass arc is greater than that of tungsten inert gas welding (TIG) welding. However, under high-frequency bypass arc conditions, the weld width is similar to that of TIG welding, indicating a more effective decoupling of heat and mass transfer in this method. Moreover, compared to TIG welding and low-frequency cross-coupled arc welding, the high-frequency bypass cross-coupled method refines the weld zone grains, enhances material toughness, and improves the tensile properties of the weld.
高频振动电弧条件下304不锈钢组织与力学性能研究
在传统的交叉耦合焊接中,主电弧随着旁通电弧极性的变化而摆动,导致热分布不均匀,影响传热传质的解耦。针对这一问题,提出了一种基于高频旁路电弧的交叉耦合焊接方法。当旁路电弧工作在超过20khz的高频时,主电弧不随极性变化而明显摆动。相反,它的振动频率高,振幅小。为了验证这种振动行为是否影响熔池流动并促进晶粒细化,设计并进行了一系列实验。结果表明,在相同条件下,50 Hz旁路电弧交叉耦合焊接产生的焊缝宽度大于钨惰性气体焊接(TIG)。然而,在高频旁路电弧条件下,焊缝宽度与TIG焊接相似,表明该方法更有效地解耦了传热传质。此外,与TIG焊和低频交叉耦合弧焊相比,高频旁路交叉耦合方法细化了焊缝区晶粒,增强了材料韧性,改善了焊缝的拉伸性能。
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来源期刊
Journal of Manufacturing Processes
Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-
CiteScore
10.20
自引率
11.30%
发文量
833
审稿时长
50 days
期刊介绍: The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.
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