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Effect of TIG arc characteristics on weld morphology and structure of AISI444 ferritic stainless steel under pulse current

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Abstract

Herein, we theoretically and experimentally examined the effects of current pulse frequency on arc characteristics, weld appearance, and weld microstructure of AISI444 ferritic stainless steel (FSS) welded by tungsten inert gas (TIG). The arc shape, pressure, and density distribution of TIG welding were measured using a high-speed camera and the sensor measurement and keyhole probe methods. Moreover, the arc characteristics, weld appearance, and weld microstructure under 0- to 500-Hz current pulse frequency were examined. The results show that the arc shape gradually compresses with increasing pulse frequency. When the pulse frequency is 500 Hz, the compression effect is the most obvious, the arc pressure and arc density are the largest, the weld penetration depth is the largest, and the melting width is the smallest. When the pulse frequency is 300 Hz, the finest equiaxed crystal microstructure is obtained. Furthermore, the mechanism of arc compression, arc pressure increase, weld morphology change, and grain refinement is analyzed.

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Funding

The present research work was financially supported by the Project of the National Natural Science Foundation of China (grant no. 51575362), the Major Project of Scientific and Technological Achievement Transformation of Shenyang (grant no. 20-203-5-01), and the Ministry of Education and Science of Russian Federation (grant no. 11.9505.2017/8.9).

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Authors and Affiliations

  1. Shenyang University of Technology, No. 111, Shenliao West Road, Economic & Technological Development Zone, Shenyang, 110870, People’s Republic of China

    Zhihai Dong, Yiwen Li, Hong Wu & Yunlong Chang

  2. Hebei University of Engineering, Handan, 056038, China

    Hong Wu

  3. Institute of Mechanical Engineering, Lipetsk State Technical University, 398024, Lipetsk, Russia

    Aleksandr Babkin

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  1. Zhihai Dong
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  2. Yiwen Li
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  3. Hong Wu
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  4. Aleksandr Babkin
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  5. Yunlong Chang
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Correspondence to Yunlong Chang.

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Recommended for publication by Commission XII - Arc Welding Processes and Production Systems

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Dong, Z., Li, Y., Wu, H. et al. Effect of TIG arc characteristics on weld morphology and structure of AISI444 ferritic stainless steel under pulse current. Weld World 65, 2093–2104 (2021). https://doi.org/10.1007/s40194-021-01168-2

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