Weld bead temperature and residual stresses evaluations in multipass dissimilar INCONEL625 and SS316L by GTAW using IR thermography and x-ray diffraction techniques

Vemanaboina, Harinadh; Gundabattini, Edison; Akella, Suresh

doi:10.1088/2053-1591/ab3298

Cited by 23 publications

(10 citation statements)

References 22 publications

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“…The gas tungsten arc welding (GTAW) process is widely employed to join highstrength alloys with suitable filler materials with both constant and pulsed current processes [2][3][4]. As per the earlier research, the microstructures were observed to have satisfactory solid solubility with parent and filler metals but a wide fusion zone.…”

Section: Introductionmentioning

confidence: 84%

Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints

Vemanaboina

Gundabattini

Akella³

et al. 2021

Applied Sciences

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In the frame of the circular economy, welding of Ni-based superalloys has gained increasing importance when applied, for instance, to repairing highly expensive components widely used in strategical sectors, such as the defense and aerospace industries. However, correct process parameters avoiding metallurgical defects and premature failures need to be known. To reach this goal, Inconel 625 butt-welded joints were produced by CO2 laser beam welding and different combinations of process parameters. The experimental investigation was carried out with three parameters in two levels with an L4 orthogonal array. Laser power, welding speed, and shielding gas flow rate were varied, and the results were reported in terms of mechanical properties, such as microhardness, tensile strength, distortion, residual stress, and weld bead geometry, and metallurgy. At a lower welding speed of 1 m/min, the full penetration was observed for 3.0 kW and 3.3 kW laser powers. However, sound welds (porosity-free) were produced with a laser power of 3.3 kW. Overall, the obtained full-penetration specimens showed a tensile strength comparable with that of the parent material with residual stresses and distortions increasing with the increase in heat input.

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Section: Introductionmentioning

confidence: 84%

Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints

Vemanaboina

Gundabattini

Akella³

et al. 2021

Applied Sciences

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“…In trail-2 to trail-3, it was about 0.16 kJ/mm difference in heat input, but the distortion was raised to 0.23 °. In all the joints, distortion was lower at the Inconel side than the stainless steel side; this is due to higher thermal conductivity and lower thermal expansion coefficient of the SS alloy [18]. e weld distortion increases with the increase of the total heat input (Figure 5).…”

Section: Distortionmentioning

confidence: 94%

“…In a dissimilar weld, there is also an effect induced by both the nonuniform heat flux resulting from different values of alloys thermal conductivity and different thermal expansions coefficients of the coupled alloys. e calculation of the weldment's angular distortion [17][18][19][20], expressed in degrees, is carried with…”

Section: Heat Inputmentioning

confidence: 99%

Effect of Heat Input on Distortions and Residual Stresses Induced by Gas Tungsten Arc Welding in SS 316L to INCONEL625 Multipass Dissimilar Welded Joints

Vemanaboina¹,

Babu

Gundabattini

et al. 2021

Advances in Materials Science and Engineering

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In the present study, distortion and residual stresses in the multipass welded joint were analyzed with respect to heat input. The welded joint was produced using the gas tungsten arc welding (GTAW) process with dissimilar Ni-based filler of ERNiCrMo-3. This dissimilar joint is essential in power generating nuclear and thermal plants operating at elevated temperatures. The distortion and residual stress measurements were taken using the Vernier height gauge and XRD method. To evaluate the mechanical properties, tensile testing was carried out at room temperature. The welded joint qualified the tensile test with an average value of 593 MPa. In the weld metal, a significant variation of residual stresses is measured on the top surface of the weldment along with the thickness with peak magnitude of 145 MPa to 180 MPa at the fusion zone.

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“…The temperature distribution 29 , 30 can be collected from the infrared thermography where it detects the infrared energy emitted from the object, and it converts into temperature distribution. The output of the thermal camera is in the form of the standard video signal, which shows the temperature distribution of the component.…”

Section: Experimentationmentioning

confidence: 99%

Analysis of thermal stresses and its effect in the multipass welding process of SS316L

Vemanaboina¹,

Akella²,

Rao³

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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In this work, simulation has been carried out for multipass Gas tungsten Arc Welding of SS316L and their effects were studied for thermal, and residual stresses and compared with experimental results. The sequentially coupled thermo-mechanical, transient thermal and static structural analysis was modelled using ANSYS with relevant Ansys Parametric Design Language coding. Infrared thermography camera was used to obtain the real time temperatures during the welding. The effect of temperatures and the induced residual stresses of the weldment is measured with X-Ray diffraction technique. Tensile residual stresses have been identified at fusion zone and compressive stresses at heat affected zone. Pass wise temperature measurements were taken from analysis and experiment the agreement with 7.24%. The agreement of measured and analysed residual stress had an agreement with 16.66%.

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Weld bead temperature and residual stresses evaluations in multipass dissimilar INCONEL625 and SS316L by GTAW using IR thermography and x-ray diffraction techniques

Cited by 23 publications

References 22 publications

Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints

Mechanical and Metallurgical Properties of CO2 Laser Beam INCONEL 625 Welded Joints

Effect of Heat Input on Distortions and Residual Stresses Induced by Gas Tungsten Arc Welding in SS 316L to INCONEL625 Multipass Dissimilar Welded Joints

Analysis of thermal stresses and its effect in the multipass welding process of SS316L

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