The effect of gas tungsten arc welding and pulsed-gas tungsten arc welding processes’ parameters on the heat affected zone-softening behavior of strain-hardened Al–6.7Mg alloy

Hadadzadeh, Amir; Ghaznavi, Majid Mahmoudi; Kokabi, A.H.

doi:10.1016/j.matdes.2013.09.061

Cited by 26 publications

(8 citation statements)

References 9 publications

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“…Lower duty cycle results in finer microstructure due to large time available for cooling 50) . The optimum value of duty cycle was resulted 50% improvement in grain refinement for AZ31B magnesium alloy 49) . It is also observed the interaction effect of background current and peak current for grain size at fusion zone of AA6061 52) .…”

Section: Effect Of Pulsed Parameters On Metallurgical Propertiesmentioning

confidence: 99%

“…following additional pulsed power source parameters influences more in welding qualities. a) Peak Current b) Background Current c) Frequency d) Duty cycle (% of time for peak current) 4.1.1 Effect of pulsed welding process parameters on mechanical properties For magnesium AZ31B and AZ61A alloy, it was found that peak current is most influencing parameter that affect the tensile strength 48,49) . One contradictory result was found which indicated that when peak current increases the tensile strength reduces for strain hardened Al-6.7Mg alloy.…”

Section: Pulsed Power Source Parameters Influencing Weld Bead Propertmentioning

confidence: 99%

“…Contour plot for tensile strength of AA606149) Penetration (P), mm, bead width (w), mm, aspect ratio (AR), heat input (hi), Effect of peak current on various components of weld bead geometry for AISI304L 48) 3D weld bead shape for different pulse frequency54) Journal of Welding and Joining, Vol. 37, No.…”

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confidence: 99%

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A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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Tungsten Inert Gas (TIG) welding process is used in the industry due to its positional suitability, good control over metallurgical and mechanical properties and weld integrity. It makes this process more suitable to weld the root pass in the piping industries. However, there is a remarkable limitation to increase the welding current beyond a certain limit in the conventional TIG welding process due to limited current carrying capacity of a single electrode and higher arc pressure. This limits its productivity. To combat it, Twin TIG (T-TIG) welding process is introduced where the two tungsten electrodes are present in one torch. The two separate and synchronized power sources are connected to the two electrodes. To increase the metal deposition rate, the hot filler wire is used because it reduces the requirement of heat from arc plasma. There is another advancement in the TIG welding process which incorporates pulsed power source assisted welding process to control weld bead geometry, microstructure and to weld dissimilar material. This paper presents the effect of parameters of T-TIG, hot wire, and pulsed current welding processes when performed separately. A novel welding set up is proposed to weld dissimilar material with weld integrity. This paper suggests that when these three techniques are used simultaneously by meticulous studies of their process parameters with automation, an outperformed technique can be evolved which multiples the individual advantages of the three processes.

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Section: Effect Of Pulsed Parameters On Metallurgical Propertiesmentioning

confidence: 99%

Section: Pulsed Power Source Parameters Influencing Weld Bead Propertmentioning

confidence: 99%

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A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Shah

Agrawal

2019

Journal of Welding and Joining

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“…Elevadas frecuencias de pulsación producen mayor agitación de la pileta líquida provocando la fragmentación de las dendritas. Esta fragmentación de las dendritas conduce a la formación de una estructura más fina y conlleva a una mayor resistencia y dureza de la zona de fusión o unión soldada (Hadadzadeh et al, 2014). A diferencia con el proceso de corriente continua constante, en el modo pulsado la energía térmica necesaria para fundir el material base se suministra solamente durante los pulsos de corriente de pulso durante breves intervalos de tiempo permitiendo que el calor se disipe en el material base.…”

Section: Análisis Metalográficounclassified

Evolución de la Microestructura para Diferentes Configuraciones de la Corriente Continua Pulsada en el Proceso de Soldadura GTAW Autógeno

Maldonado

Díaz

2020

Soldag. insp.

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Resumen: El objetivo del estudio es verificar la influencia de la corriente doblemente pulsada, corriente pulsada y corriente continua constante sobre la microestructura en un acero inoxidable austenítico 316L cuando se utiliza el proceso de soldadura GTAW autógeno. Para el desarrollo de este estudio de comparación todos los ensayos se realizaron con la misma energía de soldadura con el objetivo de verificar la influencia que presenta la modulación de la corriente sobre la microestructura de la región fundida. Los resultados indican que la corriente doblemente pulsada fue la que presentó el mayor refinamiento de la microestructura asociado a la mayor frecuencia de pulsación de la corriente alcanzada. Los perfiles de microdureza para los tres formatos de corriente utilizados revelan que existe un leve aumento del valor de dureza para el formato de corriente doblemente pulsada respecto al pulsado convencional y a la corriente continua constante. Esto se debe al mayor refinamiento de la microestructura que experimenta la zona de fusión debido a la mayor agitación de la pileta líquida cuando el proceso de soldadura opera con altas frecuencias de pulsación

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“…In general, fusion welding approaches like Metal Inert Gas (MIG) and Tungsten Inert Gas (TIG) have been the choice for joining aluminium plates and have been reported to be cost-effective and the most suitable welding procedure for joining AA5083 plates [2,4,5]. TIG welding produces weldments that are stronger, more ductile, and more reliable than MIG welding [6,7]. As a form of arc welding, TIG welding, involves the application of heat produced by an arc struck among a non-sacrificial tungsten electrode and a material with the aid of a shielding gas [8].…”

Section: Introductionmentioning

confidence: 99%

Post-weld friction stir processing of AA5083-F TIG welds with scandium added fillers

Aarthi¹,

Sekar²

2022

Mater. Res. Express

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The friction stir processing method was engaged on fusion welded AA5083-F/ER5356 and AA5083-F/ER5356+Sc joints to explore the impact of the process parameters on the mechanical and metallurgical characteristics of the processed weldments. The FSP approach was applied to the TIG-welded joints with pin-less FSP tool. Optical and SEM evaluation was conducted to examine the microstructure of the welds and mechanical analysis such as impact toughness, tensile, microhardness and fractography was performed to evaluate the strength of the weld. The microstructural study of the FSP joints revealed an average grain size of 4 µm for TIG welds and an average of 2 µm for the Sc added TIG weld, when compared to TIG-welded joints, which had an average grain size range of 12 µm and 8 µm for Sc added. All FSPed joints revealed a significant increase in grain refinement. There was a slight improvement in the impact resistance in FSPed samples than TIG welded samples. The FSPed joints' ultimate tensile strength (UTS), which is higher than the tensile strength of the base metal, was 288 MPa for the FSPed joints and 331 MPa with Sc added. The FSP joint's elongation range was decreased to 7.1% but improved for Sc added FSP joints up to 20.5%. The maximum hardness of FSPed TIG-welded joints was 90 HV1, while the maximum hardness of Sc added FSP joints was 95 HV1, which is significantly higher than the maximum hardness of TIG weldments. According to the fractography results, the majority of failure modes are ductile. Therefore, adopting FSP over TIG welding had enhanced the properties of the weld both mechanically and metallurgically.

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The effect of gas tungsten arc welding and pulsed-gas tungsten arc welding processes’ parameters on the heat affected zone-softening behavior of strain-hardened Al–6.7Mg alloy

Cited by 26 publications

References 9 publications

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

A Review on Twin Tungsten Inert Gas Welding Process Accompanied by Hot Wire Pulsed Power Source

Evolución de la Microestructura para Diferentes Configuraciones de la Corriente Continua Pulsada en el Proceso de Soldadura GTAW Autógeno

Post-weld friction stir processing of AA5083-F TIG welds with scandium added fillers

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