Analysis of arc and weld pool characteristics in direct current added-pulsed TIG welding process

ZHANG Gang; XU Zilong; WANG Kaifei; ZHU Ming; SHI Yu

doi:10.12073/j.hjxb.20210524003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(2): 75-81. > DOI: 10.12073/j.hjxb.20210524003

ZHANG Gang, XU Zilong, WANG Kaifei, ZHU Ming, SHI Yu. Analysis of arc and weld pool characteristics in direct current added-pulsed TIG welding process[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(2): 75-81. DOI: 10.12073/j.hjxb.20210524003

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Analysis of arc and weld pool characteristics in direct current added-pulsed TIG welding process

State Key Laboratory of Advanced Processing and Recycling Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, China

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Received Date: May 23, 2021
Accepted Date: January 27, 2022
Available Online: January 27, 2022

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Abstract

Abstract

In view of the technical requirements for rapid and reliable automatic welding repairment of defects such as corrosion cracks in the dissolver for spent fuel reprocessing, a direct current added-high-frequency pulsedd tungsten inert gas arc welding method was developed in this paper, and a series of bead on plate welding experiments with 10 and 16 mm thick plate were performed. Taking the variations of arc-weld pool characteristic as the research object, the arc characteristic, and the flow behavior and the temperature field evolution of weld pool of pulsedd TIG with adding direct current and without were compared, respectively. The mechanism of increasing weld penetration was discussed. The results show that the high-frequency pulsed current makes the arc to produce electromagnetic contraction, and the compressed degree and the weld penetration positively correlates to the pulsed frequency (1 ~ 5 kHz); the reason of the penetration increase in the direct current added- high-frequency pulsed welding process is that the direct current added pulsed arc increases the arc current and energy density and rises the surface liquid metal temperature of weld pool, and increases the electromagnetic stirring force of the molten pool to improve the flow intensify of molten pool, sufficient convection heat exchange, and enhances the thermal inertia of the molten pool, finally. This method is able to reliably realize the one-sided welding and back formation of the butt joint of 5 mm thick stainless-steel plates.
- high frequency pulse TIG welding,
- arc contraction,
- temperature field,
- weld pool,
- one-side welding and back-side formation

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Analysis of arc and weld pool characteristics in direct current added-pulsed TIG welding process