Dynamic molten pool behavior of pulsed gas tungsten arc welding with filler wire in horizontal position and its characterization based on arc voltage

2022 ◽  
Vol 75 ◽  
pp. 1-12
Author(s):  
Zitong Zeng ◽  
Zhijiang Wang ◽  
Shengsun Hu ◽  
Shaojie Wu
Keyword(s):  
Arc Welding ◽  
Molten Pool ◽  
Gas Tungsten Arc Welding ◽  
Filler Wire ◽  
Horizontal Position ◽  
Arc Voltage ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Real-time observation of cathodic cleaning during variable-polarity gas tungsten arc welding of aluminium alloy

2009 ◽  
Vol 223 (9) ◽  
pp. 1143-1157 ◽  
Author(s):  
R Sarrafi ◽  
D Lin ◽  
R Kovacevic
Keyword(s):  
Real Time ◽  
Process Parameters ◽  
Arc Welding ◽  
Molten Pool ◽  
Gas Tungsten Arc Welding ◽  
Process Conditions ◽  
Current Electrode ◽  
Gas Tungsten Arc ◽  
Variable Polarity ◽  
Gas Tungsten

Online observation is expected to provide a better understanding of the cathodic cleaning of oxides from the molten pool during variable-polarity gas tungsten arc welding (VP GTAW) of aluminium alloys. In this paper, a machine-vision system with appropriate illumination and filtering is used to monitor in real time the effect of different process parameters on the cleaning of oxides from the molten pool during VP GTAW of Al 6061. Based on the observations, the process conditions under which a clean molten pool can be achieved are determined. In addition, the control of the welding process to maintain the consistency of cathodic cleaning is discussed. The results showed that in order to have an oxide-free molten pool, the solid surface in front of the molten pool should be cleaned from oxides by the electric arc. The choice of process parameters to satisfy this condition has been discussed. It was found that the percentage of direct current electrode positive (DCEP) polarity in the cycle of current has the highest impact on the cathodic cleaning, with the arc current having less influence, and the welding speed showing the least effect. Furthermore, in order to keep the consistency of oxide cleaning, process parameters should be set or controlled to maintain the cleaned zone larger than the molten pool.

Influence of filler wire addition on weld pool oscillation during gas tungsten arc welding

2004 ◽  
Vol 9 (2) ◽  
pp. 163-168 ◽  
Author(s):  
B. Y. B. Yudodibroto ◽  
M. J. M. Hermans ◽  
Y. Hirata ◽  
G. den Ouden
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Filler Wire ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

scholarly journals Modeling of Melt Flow and Heat Transfer in Stationary Gas Tungsten Arc Welding with Vertical and Tilted Torches

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6845
Author(s):  
Shahid Parvez ◽  
Md Irfanul Haque Siddiqui ◽  
Masood Ashraf Ali ◽  
Dan Dobrotă
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Drag Force ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Filler Wire ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Steady State Simulation ◽  
Gas Drag

A 3D numerical simulation was conducted to study the transient development of temperature distribution in stationary gas tungsten arc welding with filler wire. Heat transfer to the filler wire and the workpiece was investigated with vertical (90°) and titled (70°) torches. Heat flux, current flux, and gas drag force were calculated from the steady-state simulation of the arc. The temperature in the filler wire was determined at three different time intervals: 0.12 s, 0.24 s, and 0.36 s. The filler wire was assumed not to deform during this short time, and was therefore simulated as solid. The temperature in the workpiece was calculated at the same intervals using heat flux, current flux, gas drag force, Marangoni convection, and buoyancy. It should be noted that heat transfer to the filler wire was faster with the titled torch compared to the vertical torch. Heat flux to the workpiece was asymmetrical with both the vertical and tilted torches when the filler wire was fully inserted into the arc. It was found that the overall trends of temperature contours for both the arc and the workpiece were in good agreement. It was also observed that more heat was transferred to the filler wire with the 70° torch compared with the 90° torch. The melted volume of the filler wire (volume above 1750 °K) was 12 mm3 with the 70° torch, compared to 9.2 mm3 with the 90° torch.

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