Numerical and experimental investigations of variable polarity gas tungsten arc welding

Wang, L. L.; Wei, Junhao; Wang, Z. M.

doi:10.1007/s00170-017-1387-6

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…Before welding, oil and other impurities were removed using acetone. The laser welding parameters applied in the experiments are presented in Table 2. numerically and experimentally studied by Wang et al [10]. Study interest of the solidificati mechanism and its effect on mechanical properties considering the liquid metal convection of t molten pool continues to grow.…”

Section: Methodsmentioning

confidence: 99%

“…The fluid flow and the effect of various solidification parameters during gas tungsten arc welding (GTA) of pure aluminum were investigated by Farzadi et al [9]. The correlations between the electrode positive ratio, cooling rate, and microstructure of variable polarity gas tungsten arc welding (VP-GTAW) were numerically and experimentally studied by Wang et al [10]. Study interest of the solidification mechanism and its effect on mechanical properties considering the liquid metal convection of the molten pool continues to grow.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

et al. 2018

Metals

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Laser beam welding (LBW) has been considered an effective fusion welding method for the dissimilar welding of 304 stainless steel and Ni. However, the principles governing the correlations between the heat input, weld dimension, solidified microstructure and mechanical properties have not been fully studied before. Therefore, LBW experiments with variable heat input were carried out. A transient, three-dimensional model considering liquid metal convection was developed, and solidification parameters such as temperature gradient (G), growth rate (R), and cooling rate (GR) were calculated through thermal analysis to validate the experimental results. Then, microhardness tests were carried out to verify the predications made by the simulation. Energy dispersive spectroscopy (EDS) measurements were performed to study the mass transfer. The results indicate that the joints produced by LBW were nearly defect-free. The heat input per unit length is more effective at characterizing the influence of heat input on weld dimensions. The heat input has a greater influence on the cooling rate (GR) than the morphology parameter (G/R). The results demonstrate that both the solidification characteristics and mechanical property are greatly affected by the thermal behavior in the molten pool.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

et al. 2018

Metals

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“…However, welding of aluminum alloys is considered challenging since the welding defects, such as oxide formation, porosity, hot cracking and incomplete fusion, are usually difficult to be accurately characterize and eliminate. Variable polarity-gas tungsten arc welding process has thus far been the most industrially accepted welding process for aluminum and its alloys [2], which can use advanced power supply to precisely control weld heat input and adjust the electrode positive (EP) and electrode negative (EN) independently to enable a good cleaning effect and depth of penetration.…”

Section: Introductionmentioning

confidence: 99%

“…The formation of bead defects and the quality of welds are directly affected by thermal flow behaviors and quantitative analysis of heat transfer, as well as fluid flow in the weld pool being necessary [3][4][5]. Therefore, the research on the weld pool from the viewpoint of thermal fluid science has always been an important issue in the field of welding [2,6,7]. Earlier studies of weld pool temperature heavily rely on the experimental results and observations.…”

Section: Introductionmentioning

confidence: 99%

“…Farzadi et al [12,13] predicted the local weld pool geometry, weld thermal cycle, and velocity distributions in the weld pool during GTAW of aluminum alloys under steady-state conditions. Wang et al [2] investigated the weld bead width and solidification characteristics of VP-GTAW welds with different duty ratios of direct current electrode positive (DCEP). Amir et al [14] calculated the weld pool dimensions in stationary GTAW of pure aluminum using a 2D model.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Welding Speed and Pulse Frequency on Surface Depression in Variable Polarity Gas Tungsten Arc Welding of Aluminum Alloy

Zhao

Wei

2019

Metals

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A three-dimensional (3D) numerical model with the volume of fluid method is developed for high-speed variable polarity gas tungsten arc welding (VP-GTAW) of aluminum alloys. It predicts the thermal flow field in the weld pool, the weld pool surface deformation, and solidified bead geometry during VP-GTAW in successive welding passes. Verification of the numerical model was performed by comparing the calculated results with metallography of welded cross-sections. The prediction showed reasonable accuracy in predicting weld bead geometry. The prediction average relative errors of the bead width and depth of penetration are less than 7%. The deformed weld pool surface, the fluid flow in the weld pool, and maximum fluid temperature in the workpiece based on the developed model, are discussed in detail. The effects of welding speed and pulse frequency on surface depression are studied. The results show that the maximum fluid temperature is closely correlated to the welding speed and pulse frequency. Further, the upper and lower limit of maximum fluid temperature would provide a clue by which the surface depression and the pitch of humps may be recognized. An increase in welding speed will lead to the increase of the pitch of humps, but the reverse is true in the pulse frequency. These detailed physical insights facilitate the prediction of welding surface defects in the high-speed VP-GTAW of aluminum alloy.

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The effects of welding parameters on metal transfer and bead properties in the variable-polarity GMAW of mild steel

Zeng,

Li,

et al. 2023

Int J Adv Manuf Technol

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Numerical and experimental investigations of variable polarity gas tungsten arc welding

Cited by 12 publications

References 30 publications

Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

Numerical and Experimental Investigations of Solidification Parameters and Mechanical Property during Laser Dissimilar Welding

Effects of Welding Speed and Pulse Frequency on Surface Depression in Variable Polarity Gas Tungsten Arc Welding of Aluminum Alloy

The effects of welding parameters on metal transfer and bead properties in the variable-polarity GMAW of mild steel

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