Numerical simulation on the nonaxisymmetry arc characteristics in narrow gap TIG welding: responses to welding parameters

Dong, Bolun; Cai, Xiaoyu; Lin, Sanbao; Ni, Zhida; Fan, Chenglei

doi:10.1007/s00170-021-06928-4

Cited by 8 publications

(4 citation statements)

References 35 publications

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“…Simulation results were validated by measuring the arc pressure with an apparatus in [24]. During the measurement, the welding torch moved at a slow velocity of 80 mm/min to ensure stability.…”

Section: Validation Experimentsmentioning

confidence: 99%

Numerical simulation of arc characteristics in K-TIG welding

Song,

Dong,

Cai

et al. 2024

Int J Adv Manuf Technol

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K-TIG welding is a highly efficient welding technique that enables full penetration to be achieved with a single pass, without the need for groove preparation or wire filling. Comprehending the distinct arc characteristics of K-TIG welding is the cornerstone for exploring the metallurgical process, heat, and mass transfer phenomena, and serves as a guide for design considerations. In this study, 2D numerical models of arc plasma in K-TIG welding were established. The arc characteristics of the keyhole state and nonpenetrated state were compared, while the influence of welding parameters on arc characteristics was further investigated. Finally, the calculated arc pressure was validated by experiments. Results show that the electric potential gradient in the arc column decreases after the keyhole forms, while the temperature increases at the center of the anode surface and decreases on both sides away from the arc center. Higher welding currents and smaller tungsten tip angles will lead to an increase in the temperature and velocity of arc plasma. As the tungsten tip height increases, the arc temperature increases on both sides but decreases in the arc center, and the pressure in the inner wall of the keyhole shrinks.

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Section: Validation Experimentsmentioning

confidence: 99%

Numerical simulation of arc characteristics in K-TIG welding

Song,

Dong,

Cai

et al. 2024

Int J Adv Manuf Technol

Self Cite

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“…The electron condensation heating, thermally conducted energy from the arc column, radiation cooling at the anode surface (top titanium tube surface) are considered in the energy boundary condition [24].…”

Section: Assumptions Governing Equations and Boundary Conditionsmentioning

confidence: 99%

“…The calculated arc efficiency of the high speed tandem TIG welding is about 79.8%. Tanaka et.al showed that the calculated TIG arc efficiency was 82% [24]. Stenbacka et.al proposed that the average TIG arc efficiency was about 77% [31].…”

Section: Equipment Development and Welding Proceduresmentioning

confidence: 99%

Numerical Simulation and Industrial Application of High Speed Tandem TIG Welding

Huang

Kong

et al. 2021

Preprint

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Self-developed high speed tandem TIG welding equipment were adopted to manufacture titanium welded tubes with high efficiency and high quality. The joint made by this high efficient welding process met Chinese standard requirements. A coupled electrode, arc and weld pool numerical model was also developed to investigate temperature and velocity distributions, and energy propagation of this welding process. The numerical results showed that the Marangoni stress was much higher than the arc shear stress, and was mainly positive after leading and trailing arcs in the x and y directions, so the molten metal flowed backward on the top weld pool surface. Previous studies proposed that a “pull-push” flow pattern defined as a backward molten metal flow after the leading arc and a forward molten metal flow before the trailing arc existed on the top weld pool surface in tandem arc welding processes, while it was not observed in this case. The calculated arc efficiency of the high speed tandem TIG welding was about 79.8%.

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“…www.nature.com/scientificreports/ conversion device from mechanical to electrical energy based on MHD 23 . The arc will cause high temperature, and the MHD model can also obtain the temperature field distribution of the arc 24,25 .…”

mentioning

confidence: 99%

Numerical investigations of AC arcs’ thermal characteristics in the short gap of copper-cored wires

Li,

Zhang,

Yang

et al. 2024

Sci Rep

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Excessive alternating current (AC) arcs generated in electric systems will accumulate heat and easily cause fire. This paper studies the thermal characteristics of different numbers of AC arc plasma generated in a short gap of copper-cored wires in the air. The number of AC arcs is controlled in the AC arc experiment and an infrared thermal imager measures the temperature change at the specified position. Based on magnetohydrodynamics (MHD), a two-dimensional axisymmetric AC arc discharge numerical simulation model is established. The volt-ampere characteristic of the AC arc is used to solve the MHD simulation model to obtain the same 'zero current' characteristics as the real AC arc in the experiment. A large amount of heat accumulates in the electrode gaps when the arc generation, and then the heat dissipates in the 'zero current' stage. The continuously generated arc makes the temperature higher. The volume of the space area with a temperature higher than 10,000 K increases with the arc current, but is unrelated to the number of arcs. The volume of the space area with a temperature higher than 524.15 K and the temperature on the electrode are both positively correlated with the number of AC arcs and arc current. The results of this study can provide a reference for the detection standard of AC arc faults and the prevention of electrical fire.

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Numerical simulation on the nonaxisymmetry arc characteristics in narrow gap TIG welding: responses to welding parameters

Cited by 8 publications

References 35 publications

Numerical simulation of arc characteristics in K-TIG welding

Numerical simulation of arc characteristics in K-TIG welding

Numerical Simulation and Industrial Application of High Speed Tandem TIG Welding

Numerical investigations of AC arcs’ thermal characteristics in the short gap of copper-cored wires

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