Influence of tungsten electrode geometric characteristics on the thermodynamics behavior of arc and molten pool

YANG Yicheng; DU Bing; HUANG Jihua; CHEN Jian; XU Fujia; HUANG Ruisheng

doi:10.12073/j.hjxb.20220918003

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(8): 104-108. > DOI: 10.12073/j.hjxb.20220918003

YANG Yicheng, DU Bing, HUANG Jihua, CHEN Jian, XU Fujia, HUANG Ruisheng. Influence of tungsten electrode geometric characteristics on the thermodynamics behavior of arc and molten pool[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(8): 104-108. DOI: 10.12073/j.hjxb.20220918003

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Influence of tungsten electrode geometric characteristics on the thermodynamics behavior of arc and molten pool

1.
China Academy of Machinery Science and Technology Group Co., Ltd., Beijing, 100044, China
2.
Laboratory of Materials Welding and Joining, University of Science and Technology Beijing, Beijing, 100831, China
3.
Harbin Welding Institute Limited Company, Harbin, 150028, China

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Received Date: September 17, 2022
Available Online: June 24, 2023

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Abstract

Abstract

The thermodynamics behavior of arc is a key factor affecting the flow of molten pool and welding quality. High-speed photography and numerical simulation were used to systematically analyze the influence of the characteristics of hollow tungsten electrode and solid electrode on the thermal distribution characteristics of arc. The results showed that when the welding current was 350 A, the solid tungsten electrode weld exhibited deep and narrow weld formation characteristics, while the hollow tungsten electrode weld exhibited shallow and wide weld formation characteristics. At a distance of 1 mm from the surface of the test plate, both the temperature and pressure fields along the horizontal direction of the solid tungsten electrode and the hollow tungsten electrode arc exhibit typical Gaussian distribution characteristics, and the temperature and pressure values of the hollow tungsten electrode arc at the center position are 61.9% and 23.5% of those of the solid tungsten electrode, respectively. The pressure distribution of solid tungsten electrode arc on the central axis is U-shaped, while the pressure distribution of hollow tungsten electrode arc is N-shaped. The constructed strong coupling analysis model for arc and molten pool has good consistency with the actual situation, which can used to analyze and forecast the thermodynamics behavior of arc and molten pool.
- geometric characteristics of tungsten electrodes,
- arc characteristics,
- thermo-mechanical behavior,
- numerical simulation

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