Effect of Pulsed Current Gas Tungsten Arc Welding Parameters on Microstructure of Titanium Alloy Welds

2009 ◽  
Vol 131 (6) ◽  
Author(s):  
M. Balasubramanian ◽  
V. Jayabalan ◽  
V. Balasubramanian
Keyword(s):  
Grain Size ◽  
Titanium Alloy ◽  
Weight Ratio ◽  
Gta Welding ◽  
Pulse Frequency ◽  
Welding Parameters ◽  
Pulsed Current ◽  
Thin Sections ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Titanium is one of the most important nonferrous metals, which finds extensive application in aerospace and chemical industries, because of its light weight, excellent corrosion resistance and high strength to weight ratio. Single pass gas tungsten arc (GTA) welding of thin sections of Ti–6Al–4V was accomplished with pulsing current technique and was found to be superior to conventional continuous current process in terms of grain refinement in the fusion zone. In this investigation, an attempt was made to study the effect of pulsed current GTA welding parameters on titanium alloy weld characteristics such as grain size and hardness. It was revealed that at an optimum value of 6 Hz pulse frequency and 80A peak current, the hardness was maximum and the grain size was minimum. Pulsing current in inert gas welding was found to be beneficial in titanium welding.

INVESTIGATION OF PULSE FREQUENCY ON FUSION ZONE CHARACTERISTICS OF GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS

2020 ◽  
Vol 15 (2) ◽  
Author(s):  
Subravel V
Keyword(s):  
Magnesium Alloy ◽  
Tensile Properties ◽  
Fusion Zone ◽  
Welding Speed ◽  
Pulse Frequency ◽  
Pulsed Current ◽  
Az31b Magnesium Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Different Levels

In this investigation an attempt has been made to study the effect of welding on fusion characteristics of pulsed current gas tungsten arc welded AZ31B magnesium alloy joints. Five joints were fabricated using different levels of welding speed (105 mm/min –145 mm/min). From this investigation, it is found that the joints fabricated using a welding speed of 135 mm/min yielded superior tensile properties compared to other joints. The formation of finer grains and higher hardness in fusion zone and uniformly distributed precipitates are the main reasons for the higher tensile properties of these joints

Heat Transfer Modelling and Investigation of the Effect of Pulse Frequency and Current in Pulsed Current Gas Tungsten Arc Welding

2014 ◽  
Vol 592-594 ◽  
pp. 395-399
Author(s):  
A. Prabakaran ◽  
R. Sellamuthu ◽  
Sanjivi Arul
Keyword(s):  
Heat Transfer ◽  
Weld Pool ◽  
Arc Welding ◽  
Gta Welding ◽  
Gas Tungsten Arc Welding ◽  
Transfer Model ◽  
Pulsed Current ◽  
Current Frequency ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Gas Tungsten Arc Welding (GTAW) involves several process parameters. In Pulsed Current GTAW frequency of pulse and pulse to time ratio differentiates the characteristics of weld pool geometry of from GTAW. In the present work a simple heat transfer model for Pulsed Current GTA welding was developed and the weld pool dimensions were experimentally verified with AISI 1020 steel. Relationship between speed and pulsed current frequency on weld pool dimension was studied. Weld pool dimension of pulsed and non-pulsed GTAW is studied.

The Influence of Gas Tungsten Arc Welding Parameters on Mechanical and Microstructure Properties of the TC4 Titanium Alloy

2019 ◽  
Vol 969 ◽  
pp. 895-900 ◽  
Author(s):  
Muralimohan Cheepu ◽  
D. Venkateswarlu ◽  
P. Nageswara Rao ◽  
S. Senthil Kumaran ◽  
Narayanan Srinivasan
Keyword(s):  
Titanium Alloy ◽  
Fusion Zone ◽  
Welding Speed ◽  
Welding Parameters ◽  
Bead Geometry ◽  
Box Behnken Design ◽  
Gas Tungsten Arc ◽  
Tc4 Titanium Alloy ◽  
Gas Tungsten ◽  
Zone Microstructure

In the present study, TC4 titanium alloy was gas tungsten arc welded to evaluate the mechanical and metallurgical properties of the welds. The welds were carried out at different welding conditions such as welding speed and current to identify their effect on microstructural changes and strength of the welds. The results of bead geometry measurements suggests that the fusion zone width and depth was greatly varying with the welding speed and current. It is also observed that the fusion zone microstructure and heat affected zones are greatly controlled by welding conditions. Therefore the mechanical properties of the welds were improved with the changes in welding conditions and are correlated with the metallurgical features of the welds. The optimal welding conditions were analysed using Box-Behnken design and analysis of variance technique for identifying strength of the welds and better bead geometry parameters.

Comparative Study of Constant Current and Pulsed Current GTA-Welded Al-B4C Stir Cast Composite

2015 ◽  
Vol 813-814 ◽  
pp. 410-414
Author(s):  
Sunil Sharma ◽  
Krishnamoorthy Balachandar
Keyword(s):  
Welding Process ◽  
Gta Welding ◽  
Stir Casting ◽  
Pulse Frequency ◽  
Constant Current ◽  
Compositional Variation ◽  
Pulsed Current ◽  
Gas Tungsten Arc ◽  
Novel Variant ◽  
Pulse On Time

This work focuses on the analysis of the compositional variation made during stir casting of Al-B4C metal matrix composite (MMC) and the properties of GTA weldments. Pulsed current gas tungsten arc (GTA) welding, a novel variant of traditional GTA weld process, was tried on two different composites, viz. 2 % and 4 % B4C particulates in aluminium matrix. For a chosen current and voltage, two different pulsing frequencies (2Hz & 5Hz) were combined with three different pulse on time periods (40%, 50 % & 60%) and the weldments were compared with that of constant current weldments. An attempt has been made to study the time-temperature effect of pulsed GTA welding process parameters on microhardness in as-welded condition. Pulsed current resulted in better grain refinement and the same is reflected in the microhardness values. The increase in the reinforcing composition showed increased effect on the fusion zone weld hardness levels. Increase in Pulse on time and pulse frequency of PC weldments resulted in increased hardness of both the compositions.

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