STUDY OF DROPLET TRANSFER CHARACTERISTICS AND WELD FORMATION WITH ER430LNb FERRITIC STAINLESS STEEL DURING GAS METAL ARC WELDING

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materiali in tehnologije Pub Date : 2023-05-30 DOI:10.17222/mit.2022.697

Fengde Liu, Yu Gu, Fan Xu, H. Zhang, Shaowei Xu, Zhihang Yan, Zhifeng Yan, Wen-xian Wang

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Abstract

An ER430LNb ferritic stainless steel wire was used for a gas metal arc welding (GMAW) test. The characteristics of droplet transfer and its corresponding voltage and current waveforms were investigated using a high-speed camera and synchronous acquisition of electrical signals. The weld formation, droplet transfer patterns and corresponding microstructures under different welding parameters were observed, and the effect of the current level on the droplet transfer frequency was discussed. As the results show, there were three typical metal transfer patterns during the GMAW using the ER430LNb ferritic stainless steel wire, namely short circuit transfer, mix transfer and spray transfer. With an increase in the welding current, the weld formation is changing constantly, and the droplet transfer frequency increases exponentially. With the change in the transfer pattern, the columnar ferrite structure of the weld is continuously coarsening. In addition, hardness measurements were taken on joints welded at different welding currents for comparison.

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ER430LNb铁素体不锈钢气体保护焊熔滴传递特性及焊缝成形研究

采用ER430LNb铁素体不锈钢丝进行金属气体电弧焊(GMAW)试验。利用高速摄像机和同步采集的电信号，研究了液滴的转移特性及其相应的电压和电流波形。观察了不同焊接参数下焊缝成形、熔滴传递模式及相应的显微组织，讨论了电流水平对熔滴传递频率的影响。结果表明，ER430LNb铁素体不锈钢丝在GMAW过程中存在三种典型的金属转移模式，即短路转移、混合转移和喷射转移。随着焊接电流的增大，焊缝形态不断变化，熔滴传递频率呈指数增长。随着转移方式的改变，焊缝的柱状铁素体组织不断粗化。此外，还对不同焊接电流下焊接的接头进行了硬度测量，以进行比较。

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来源期刊

Materiali in tehnologije 工程技术-材料科学：综合

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： The journal MATERIALI IN TEHNOLOGIJE/MATERIALS AND TECHNOLOGY is a scientific journal, devoted to original papers and review scientific papers concerned with the areas of fundamental and applied science and technology. Topics of particular interest include metallic materials, inorganic materials, polymers, vacuum technique and lately nanomaterials.