Research on Process Characteristics and Properties in Deep-Penetration Variable-Polarity Tungsten Inert Gas Welding of AA7075 Aluminum Alloy

IF 2.6 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals Pub Date : 2024-09-18 DOI:10.3390/met14091068

Zheng Peng, Ying Liang, Hongbing Liu, Fei Wang, Jin Yang, Yanbo Song

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Abstract

In this study, a new deep-penetration variable-polarity tungsten inert gas (DP-VPTIG) welding process, which is performed by a triple-frequency-modulated pulse, was employed in the welding fabrication of 8 mm AA7075 aluminum plates. The electric signal, arc shape, and weld pool morphology of the welding process were obtained by means of high-speed photography and an electric signal acquisition system under varying parameters of the intermediate frequency (IF) pulse current. The principle of the arc characteristics and the dynamic mechanism of the weld melting during the process are explained. In addition, the macroforming, microstructure, and microhardness of the welded joints were investigated. The results indicate that, with an intermediate frequency pulse of 750 Hz, the arc displayed a higher energy density and a more effective arc contraction, which improved weld appearance and penetration. Moreover, the impact and stirring action of the arc refined the microstructure grains of the weld center. Therefore, this new welding method is feasible for welding medium-thickness aluminum alloy plates without a groove.

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AA7075 铝合金深穿透变极性钨极惰性气体焊接的工艺特性和性能研究

本研究在 8 毫米 AA7075 铝板的焊接制造中采用了一种新型深穿透可变极性钨极惰性气体（DP-VPTIG）焊接工艺，该工艺通过三倍频率调制脉冲来实现。在改变中频（IF）脉冲电流参数的情况下，通过高速摄影和电信号采集系统获得了焊接过程的电信号、电弧形状和焊池形态。解释了焊接过程中电弧特性的原理和焊缝熔化的动态机制。此外，还研究了焊接接头的宏观成形、微观结构和显微硬度。结果表明，在 750 Hz 的中频脉冲下，电弧显示出更高的能量密度和更有效的电弧收缩，从而改善了焊缝外观和熔透性。此外，电弧的冲击和搅拌作用细化了焊接中心的微观结构晶粒。因此，这种新的焊接方法适用于焊接无凹槽的中厚铝合金板材。

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来源期刊

Metals MATERIALS SCIENCE, MULTIDISCIPLINARY-METALLURGY & METALLURGICAL ENGINEERING

CiteScore

4.90

自引率

13.80%

发文量

1832

审稿时长

1.5 months

期刊介绍： Metals (ISSN 2075-4701) is an open access journal of related scientific research and technology development. It publishes reviews, regular research papers (articles) and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Metals provides a forum for publishing papers which advance the in-depth understanding of the relationship between the structure, the properties or the functions of all kinds of metals.