Keyhole TIG welding of 3-mm-thick 10MnNiCr steel plates

Cai, Xiaoyu; Dong, Bolun; Lin, Sanbao; Duan, Shihua; Ni, Zhida; Hu, Fengya

doi:10.1007/s40194-022-01271-y

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…The analysis indicates that this phenomenon is related to the preheating temperature, and the preheating temperature from different arc currents is different. Thus, with the increase in current, both the preheating range and the preheating temperature increase [ 35 , 36 ]. It is worth noting that the thermophysical properties and boundary conditions of the material are related to temperature.…”

Section: Resultsmentioning

confidence: 99%

Effect of Dynamic Preheating on the Thermal Behavior and Mechanical Properties of Laser-Welded Joints

Xie

Shi

et al. 2022

Materials

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The high cooling rate and temperature gradient caused by the rapid heating and cooling characteristics of laser welding (LW) leads to excessive thermal stress and even cracks in welded joints. In order to solve these problems, a dynamic preheating method that uses hybrid laser arc welding to add an auxiliary heat source (arc) to LW was proposed. The finite element model was deployed to investigate the effect of dynamic preheating on the thermal behavior of LW. The accuracy of the heat transfer model was verified experimentally. Hardness and tensile testing of the welded joint were conducted. The results show that using the appropriate current leads to a significantly reduced cooling rate and temperature gradient, which are conducive to improving the hardness and mechanical properties of welded joints. The yield strength of welded joints with a 20 A current for dynamic preheating is increased from 477.0 to 564.3 MPa compared with that of LW. Therefore, the use of dynamic preheating to reduce the temperature gradient is helpful in reducing thermal stress and improving the tensile properties of the joint. These results can provide new ideas for welding processes.

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Section: Resultsmentioning

confidence: 99%

Effect of Dynamic Preheating on the Thermal Behavior and Mechanical Properties of Laser-Welded Joints

Xie

Shi

et al. 2022

Materials

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“…In recent years, three primary methods have been employed to study electric arcs in welding processes: experimental observation [9][10][13][14], theoretical analysis [15][16], and numerical simulation [12,17]. Experimental observation involves capturing high-speed images of the arc and analyzing its behavior.…”

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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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Numerical simulation of arc characteristics in K-TIG welding

Song¹,

Dong

Cai³

et al. 2023

Preprint

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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 non-penetrated 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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Keyhole TIG welding of 3-mm-thick 10MnNiCr steel plates

Cited by 3 publications

References 15 publications

Effect of Dynamic Preheating on the Thermal Behavior and Mechanical Properties of Laser-Welded Joints

Effect of Dynamic Preheating on the Thermal Behavior and Mechanical Properties of Laser-Welded Joints

Numerical simulation of arc characteristics in K-TIG welding

Numerical simulation of arc characteristics in K-TIG welding

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