Microstructure and mechanical properties of alloy C-276 weldments fabricated by continuous and pulsed current gas tungsten arc welding techniques

Manikandan, M.; Arivazhagan, N.; Rao, M. Nageswara; Reddy, G. Madhusudhan

doi:10.1016/j.jmapro.2014.08.002

Cited by 95 publications

(28 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The introduction of a secondary vibratory motion perpendicular to the weld plane during welding resulted in strengths 20% higher than those of samples welded using the standard vibration welding process. Rao et al (2014) developed a new vibratory welding technique for inducing mechanical vibrations into the weld pool during welding process is proposed. The designed vibratory set-up produces the required vibrations at frequency with the amplitude and acceleration in terms of voltages.…”

Section: Figmentioning

confidence: 99%

“…This is developed for controlling metal transfer at low mean current levels by imposing short duration high current pulses to improve the mechanical properties of weldments. In this regard, several papers have been published to investigate the influence of this method on hardness, tensile strength, residual stress field and ductility of different materials including titanium matrix composites, aluminium 6061-T6 alloy, DP980 steel, C-276 alloy, SS304 steel, AA6082-T6 Aluminium alloy (Mao et al, 2014;Raveendra & Kumar, 2013;Aliha & Gharebaghi, 2017;Sawanishi et al, 2014;Balasubramanian et al, 2008;Manikandan et al, 2014;Ravindra et al, 2013;Ravikumar et al, 2014). In the aforementioned researches, some techniques including conventional GTAW method, Pulsed Current Gas Tungsten Arc Welding (PCGTAW), continuous current GTAW and continuous current GMAW have been investigated and compared together.…”

Section: Introductionmentioning

confidence: 99%

“…In the aforementioned researches, some techniques including conventional GTAW method, Pulsed Current Gas Tungsten Arc Welding (PCGTAW), continuous current GTAW and continuous current GMAW have been investigated and compared together. As an example, Manikandan et al (2014) experimentally showed that the tensile strength of welded joints is increased when using pulsed current welding technique compared to the non-pulsed current welding.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A review on techniques for improving the mechanical properties of fusion welded joints

Kalpana¹,

Rao²,

Rao³

2017

10.5267/j.esm

View full text Add to dashboard Cite

This paper presents the effect of Post Weld Heat Treatment (PWHT), pulsed current welding, hybrid welding and vibratory assisted welding in the weld quality, residual stresses and mechanical properties of welded joints. At last, vibratory assisted welding has been suggested to enhance the mechanical properties of welded joints by overcoming the drawbacks in the above stated techniques. Past results showed that the welded test specimens under vibratory conditions exhibited improvements in mechanical properties than the arc welding without vibrations. Finally, some literature gaps are clearly identified and these gaps could help the future generation researchers to do work in the new direction.

show abstract

Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A review on techniques for improving the mechanical properties of fusion welded joints

Kalpana¹,

Rao²,

Rao³

2017

10.5267/j.esm

View full text Add to dashboard Cite

show abstract

“…This is due to the fine grain structure attained in pulsed current welding. Manikandan et al [12] observed an improvement in tensile strength of welded joints is achieved in both autogenous and with filler wire, when compared to non-pulsed current welding. Ravindra et al [13] found that there is an improvement in hardness of welded joints produced with pulsed current compared to non-pulsed current TIG welding.…”

Section: Effect Of Pulsed Currentmentioning

confidence: 99%

GRNN-Immune Based Strategy for Estimating and Optimizing the Vibratory Assisted Welding Parameters to Produce Quality Welded Joints

Rao¹,

Rao²,

Deepak³

2017

View full text Add to dashboard Cite

Abstract.Welding is the process of producing permanent joints with the application of pressure and/or heat energy. During welding operation, weldments may be subjected to uneven thermal stresses. These stresses influence the metallurgical structure of the component. Due to this, the strength of the weld joint is reduced. Therefore, vibratory weld treatment during welding has been proposed in the present work to enhance the flexural and impact strength of weldments. However, it is found that the mechanical properties have shown nonlinear behavior with the chosen input parameters. Hence, an efficient Neural Network (NN) based prediction tool is developed to approximate the mechanical properties of weldments without performing the experiments, output values can be predicted for the given input values. Further, an immune based strategy is integrated to the developed prediction tool in order to obtain desired quality welded joints.

show abstract

“…The 0.4-mm-thick Hastelloy C-276 thin sheet was welded by GTAW without filler metal, and both the heat affected zone (HAZ) and a secondary phase were detected. Manikandan et al [5][6][7] reported that, by current pulsing, the microstructure and mechanical behavior of GTAW of Hastelloy C-276 could be improved. Pulsed Current Gas Tungsten Arc (PCGTA) and mechanical behavior of GTAW of Hastelloy C-276 could be improved.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Pulse Parameters on Weld Geometry and Microstructure of a Pulsed Laser Welding Ni-Base Alloy Thin Sheet with Filler Wire

Chai

et al. 2016

Metals

View full text Add to dashboard Cite

Due to its excellent resistance to corrosive environments and its superior mechanical properties, the Ni-based Hastelloy C-276 alloy was chosen as the material of the stator and rotor cans of a nuclear main pump. In the present work, the Hastelloy C-276 thin sheet 0.5 mm in thickness was welded with filler wire by a pulsed laser. The results indicated that the weld pool geometry and microstructure were significantly affected by the duty ratio, which was determined by the pulse duration and repetition rate under a certain heat input. The fusion zone area was mainly affected by the duty ratio, and the relationship was given by a quadratic polynomial equation. The increase in the duty ratio coarsened the grain size, but did not obviously affect microhardness. The weld geometry and base metal dilution rate was manipulated by controlling pulsed parameters without causing significant change to the performance of the weld. However, it should be noted that, with a larger duty ratio, the partial molten zone is a potential weakness of the weld.

show abstract

Microstructure and mechanical properties of alloy C-276 weldments fabricated by continuous and pulsed current gas tungsten arc welding techniques

Cited by 95 publications

References 8 publications

A review on techniques for improving the mechanical properties of fusion welded joints

A review on techniques for improving the mechanical properties of fusion welded joints

GRNN-Immune Based Strategy for Estimating and Optimizing the Vibratory Assisted Welding Parameters to Produce Quality Welded Joints

The Effects of Pulse Parameters on Weld Geometry and Microstructure of a Pulsed Laser Welding Ni-Base Alloy Thin Sheet with Filler Wire

Contact Info

Product

Resources

About