Effect of Pulsed Current on Temperature Distribution and Characteristics of GTA Welded Magnesium Alloy

Karunakaran, N.

doi:10.9790/1684-0460108

Cited by 15 publications

(10 citation statements)

References 15 publications

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“…Logically, the heat input has a significant impact on the bead geometry and on the metallurgical, mechanical, and corrosion resistance properties of the welds, as mentioned by Giridharan et al 13 Similarly, Karunakaran 14 and Farahani 15 reported that the rate of heat input during welding, along with the nature of cooling, has a strong influence on the grain size and phase formation. It was also recommended by Martin 16 that the maximum heat input that can be employed for joining AISI 304L should not exceed a plate thickness of 1.5 kJ/mm.…”

Section: Methodsmentioning

confidence: 94%

Hot‐cracking susceptibility of fully austenitic stainless steel using pulsed‐current gas tungsten arc‐welding process

Abu‐Aesh

Taha

El–Sabbagh

et al. 2020

Engineering Reports

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The pulsed‐current gas tungsten arc‐welding process (PCGTAW) has recently been recommended as an approach to eliminate the high susceptibility of austenitic stainless steel to hot cracking. Within a wide range of variables, in the present study, the effects of pulse frequency, time ratio, and pulse current on the cracking susceptibility of austenitic stainless‐steel thin sheets are investigated. A fan‐shaped cracking test specimen is adopted, and suitable final dimensions are obtained by conducting some preliminary experiments. A good correlation is found between the maximum crack length, which is taken as a cracking susceptibility index, and the pulse form variables. The results are found to be significantly improved when compared with those of the continuous‐current process, which indicates that the PCGTAW process has an effective role in reducing the hot‐cracking susceptibility. The optimal conditions of the pulse form variables based on the hot‐cracking susceptibility are determined. The optimal values of the time ratio are found to be less than 50%, together with a pulse frequency of less than 1 Hz. Some new microstructure measures, such as columnar structure ratio, grain orientation angle, puddle diversion angle, and overlapping ratio, which are originally defined in this work, in addition to grain size and puddle form factor (aspect ratio), are used to interpret the hot‐cracking behavior. All are found to have a direct impact on the hot‐cracking susceptibility. The results obtained from microstructure examinations showed that the cracks formed are either intergranular or transgranular cracks.

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Section: Methodsmentioning

confidence: 94%

Hot‐cracking susceptibility of fully austenitic stainless steel using pulsed‐current gas tungsten arc‐welding process

Abu‐Aesh

Taha

El–Sabbagh

et al. 2020

Engineering Reports

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show abstract

“…Al alloys are presently utilized in different sectors due to their higher characteristics of quality, such as resistance to corrosion, recyclability, and less specific gravity [1,2]. Today, their use is still widening, highly in the aerospace and automobile and industries [3]. As indicated in the investigation via Fortain and Gadrey [4], the principal uses of products of Al have been in construction (20%), transportation (27%), electricity supply (10%), packaging (16%), machinery and equipment (8%) as well as in sectors that relate to the sustainable products (7%), where the exceptional growth that reaches to (60) million tons by (2020) has been forecasted.…”

Section: Introductionmentioning

confidence: 99%

Effect of Filler Metals on Microstructure and Mechanical Properties of GTAW Welded Joints of Aluminum Alloy (AA2024-T3)

Abbass

Ul-Qader

2020

ETJ

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This study presents an appropriate filler metal or welding electrode to join aluminum alloy (AA2024-T3) sheet of 3.2 mm thickness with a square butt joint using Gas Tungsten Arc Welding (GTAW) process. This process was carried out at three different welding currents with three various filler metals: ER4047 (12% Si), ER4043 (5% Si), and ER5356 (5% Mg). Experiments were conducted to investigate the microstructure and the mechanical properties. The effect of various filler metals upon the weld joints quality were analyzed via an X-ray radiographic and tensile test. Hardness test, microstructures, SEM, and XRD also conducted to the welded specimens. It was found that the best result was at 100 Ampere with using filler metal (ER5356) which produced the highest strength of 240 MPa in comparison with welded joints with utilizing fillers (ER4043) and (ER4047) having values of 235 MPa and 225 MPa, correspondingly. The hardness results showed that the highest hardness values were at the weld metal for ER4047 and ER4043, then decreased to HAZ and increased in the base metal. While in the case of ER5356, the highest hardness was in HAZ and decreased in the weld metal. The fractography of the fracture surface of the welded joints after the tensile test was analyzed using SEM.

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“…Aluminum alloys are currently used in various sectors because of their higher quality characteristics like low specific gravity, corrosion resistance and recyclability [1][2][3]. Nowadays, their application is still expanding, mostly in the automobile and aerospace industries [4][5][6]. As shown in the study by Fortain and Gadrey [7], the main applications of aluminum products have been in transportation (27%), construction (20%), packaging (16%), electricity supply (10%), machinery and equipment (8%) and also in sectors relating to sustainable products (7%) where extraordinary growth reaching 60 million tons by 2020 has been predicted.…”

Section: Introductionmentioning

confidence: 99%

Effect of Filler on Weld Metal Structure of Aa6061 Aluminum Alloy by Tungsten Inert Gas Welding

Ishak¹,

Noordin²,

Razali³

et al. 2015

Int. J. Automot. Mech. Eng.

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Innovative welding technology in joining aluminum alloys in the automobile, aviation, aerospace and marine industries would achieve weight reduction and high specific strength as well as increasing fuel efficiency and reducing environmental pollution. This study presents an appropriate welding filler to join similar AA6061 aluminum alloys using the tungsten inert gas (TIG) process. The TIG welding of AA6061 was butt joined with three different fillers: ER5356 (4.5-6% Mg), ER4043 (4.5-6% Si) and ER4047 (11-13% Si). The experiments were conducted in order to investigate the macrostructure and microstructure of the samples as well as the mechanical properties. The effect of preheating was also investigated. The effects of the different fillers used on the weld joints were analyzed by their visual appearance, microstructures, hardness and strength. It was found that welding by using filler ER5356 produced a finer grain size and the highest strength of 171.53 MPa compared to the weld joints using fillers ER4047 and ER4047 with values of 167.34 MPa and 168.03 MPa, respectively.

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Effect of Pulsed Current on Temperature Distribution and Characteristics of GTA Welded Magnesium Alloy

Cited by 15 publications

References 15 publications

Hot‐cracking susceptibility of fully austenitic stainless steel using pulsed‐current gas tungsten arc‐welding process

Hot‐cracking susceptibility of fully austenitic stainless steel using pulsed‐current gas tungsten arc‐welding process

Effect of Filler Metals on Microstructure and Mechanical Properties of GTAW Welded Joints of Aluminum Alloy (AA2024-T3)

Effect of Filler on Weld Metal Structure of Aa6061 Aluminum Alloy by Tungsten Inert Gas Welding

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