Marangoni convection and weld shape variation in A-TIG welding process

Xu, Yafei; Dong, Zuomin; Wei, Yanhong; Yang, Chunli

doi:10.1016/j.tafmec.2007.05.004

Cited by 116 publications

(45 citation statements)

References 11 publications

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“…Besides sulfur, oxygen is also found to be an active element. Oxide particles [34,35], such as SiO 2 , TiO 2 , and Al 2 O 3 , and oxygen in shielding gas were found to influence surface tensions. Lu [36] systematically studied weld pool shape in GTA welding with different oxygen content in the argon shielding gas.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on laser keyhole welding of 42CrMo under air and argon atmosphere

et al. 2016

Int J Adv Manuf Technol

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Laser keyhole welding of 42CrMo in air and argon atmospheres has been studied both experimentally and numerically. Significant macroscale difference is observed for welding carried out under argon and air shielding. Fusion zone of welding under argon shielding has a "▽" shape, while it has a "U" shape for welding in air. The surface of the weldment is smoother for welding in argon when compared with that in air. Oxygen effect is proposed to account for the experimental results. A three-dimensional heat transfer model with a predefined keyhole is developed to study the heat transport and fluid flow in laser welding process. The variation of weld pool geometry and temperature history is investigated for different oxygen concentrations. It is found that a small amount of oxygen could significantly modify the weld pool dimension, while keeping the temperature history of materials, and thus the microstructure, in the fusion zone and heat-affected zone unchanged.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on laser keyhole welding of 42CrMo under air and argon atmosphere

et al. 2016

Int J Adv Manuf Technol

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“…In this case, the liquid metal movement in the pool became vertical [16]. Thus, the vertical liquid metal movement in the A-TIG weld pool increased the penetration depth [17]. Figure 2 indicates us the importance of the TiO 2 /Acetone volume ratio.…”

Section: Discussionmentioning

confidence: 89%

Effects of welding parameters on penetration depth in mild steels A-TIG welding

Kurtulmuş

2018

Scientia Iranica

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A-TIG welding is a welding method in which TIG welding is conducted by covering a thin layer of activating flux on the weld bead beforehand. The most benefit of this process is the gain in weld penetration depth. A-TIG welds were produced on mild steel plates with TiO 2 flux. The emphasis of this paper lies in introducing the effects of various process parameters (welding current, welding speed, powder/acetone ratio of the flux, arc length and electrode angle) in mild steel A-TIG welding. The weld penetration depth was the measured metallographically. An optimum value was determined for each welding parameter.

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“…During the measurement, the stage was moved along the x-axis and a vertical displacement Z was obtained. The angular distortion value calculated from the (1) θ = tan -1 x/z (1) Finally, five different positions on either side of the welds were averaged, and then added together to give the angular distortion value [9]. Fig.…”

Section: Theories Of Active Flux Weldingmentioning

confidence: 99%

“…The GTAW is thus a method of choice in industries as diverse as nuclear, aerospace, and pharmaceutical and food processing. Indeed beyond 3 mm it is necessary to perform edge preparation (chamfer) and adding filler material by multi pass welding [1]- [3]. This is due to low yielded arc centrifugal convection current which unfavorable for high penetration weld.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flux Coated Gas Tungsten Arc Welding on 304L

Zuber¹,

Chaudhri²,

Suri³

et al. 2014

IJET

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Abstract-Purpose of present work is to investigate the effect of oxide flux on welding of austenitic stainless steel 304L plates having thickness 8 mm its effect on welding distortion, ferrite number, hardness value and depth of penetration. SiO 2 is used as a flux in the form of powder mixed with the acetone and applied on bead plate without making a joint preparation and without addition of filler wire. The result showed that this technique can increase depth of penetration and weld aspect ratio resulting in lower angular distortion. The ferrite content in the weld joint obtained is 14% by weight; the increase in the ferrite content is due to assistance of flux in rapid cooling therefore more ferrite content in 304L weld metal during the solidification after welding. Finite Element analysis of plate has been carried out using SYSWELD. Three dimensional double ellipsoidal (Goldak) heat source is used to model the heat flow during the welding. the heat source definition has been validated against the experimentally obtained grain structure (macrograph) and thermal history. Finally transient thermal analysis of welded plate has been done for study the peak temperature reaching in flux coated GTA welding.

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Marangoni convection and weld shape variation in A-TIG welding process

Cited by 116 publications

References 11 publications

Experimental and numerical study on laser keyhole welding of 42CrMo under air and argon atmosphere

Experimental and numerical study on laser keyhole welding of 42CrMo under air and argon atmosphere

Effects of welding parameters on penetration depth in mild steels A-TIG welding

Effect of Flux Coated Gas Tungsten Arc Welding on 304L

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