Thermal fields and residual stresses analysis in TIG weldments of SS 316 and Monel 400 by numerical simulation and experimentation

Yelamasetti, Balram; Rajyalakshmi, G.

doi:10.1088/2053-1591/ab23cf

Cited by 40 publications

(10 citation statements)

References 31 publications

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“…Balram and Rajyalakshmi studied the multi-pass arc welding of dissimilar metals, and their model results are in good match with experiments [22]. Double-pass GTAW welding of aluminum plates was studied by other authors [23].…”

Section: Introductionmentioning

confidence: 71%

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2021

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Hard-facing process is widely used for improving the wear resistance of mild steel. During the application of hard-facing, due to high temperatures, residual stresses and deformations may occur. The tensile residual stresses may cause crack propagation on the hard-faced part. The purpose of this study is to utilise minimum computer work for minimizing these residual stresses and deformations during the hard-facing of mild steel. The fully coupled transient heat transfer and structural analysis was performed for calculations. The double-ellipsoidal moving heat source was utilised to simulate the heat input from the gas metal arc welding (GMAW). Only eight numerical simulations were performed to minimize the computer work; the grey relational analysis was used for minimizing both the residual stresses and deformations. Welding speed, welding current, and welding pattern were considered as changing parameters. At the end of the numerical and statistical solutions, it is observed that heat input should be kept minimum to minimize the stresses and deformations. But it is obvious that the heat input must provide a temperature greater than the melting point. Straight patterns always produce better results for minimizing stresses and deformations. Transverse stress at the beginning and end of the longitudinal path gets higher significantly after cooling. Cooling does not affect the total deformation.

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Section: Introductionmentioning

confidence: 71%

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2021

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“…24 To consider the volumetric thermal flux on the workpiece, the “GOLDACK” method is utilized. 25 The weld-depositing model is applied based on element birth and death method. In this study, the heat transfer coefficients for both radiation and convection are employed.…”

Section: D Fe Modelingmentioning

confidence: 99%

Numerical investigation on the effect of welding speed and heat input on the residual stress of multi-pass TIG welded stainless steel pipe

Asadi

Alimohammadi

Kohantorabi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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A numerical investigation is provided to study the residual stress states in multi-pass TIG welding of stainless steel SUS304 pipe. An uncoupled thermomechanical three-dimensional finite element model is developed using the ABAQUS software for a circular weld design around the pipe. The effects of weld pass numbers, electrode moving speed, and heat input on the internal and external surface tensions of the pipe are investigated. The simulation results show that by increasing the welding speed, the axial tensile stresses decrease on the pipe surfaces. In the case of hoop stress, as the welding speed raises, the tensile and compressive stresses are increased for both two- and three-pass welding. However, the width of the stress zone becomes narrower in higher welding speeds. The hoop stresses, in comparison with the axial stresses, are more strongly influenced by the welding speed and the heat input. Furthermore, using the three-pass welding process results in much lower stresses in comparison with the two-pass one.

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“…In this welding process, the two types of welding current, namely, peak current and low current are maintained to obtain the required penetration, bead formation and stability of welding arc. 13 Balram et al 14 discussed about the development of residual stresses in AISI316 and Monel 400 welds with pulse current technique at a fixed frequency of 4 Hz. The results have indicated a reduction in the residual stress near the weld when welds are developed using pulse current technique and have attributed this reduction because of controlled heat inputs.…”

Section: Introductionmentioning

confidence: 99%

Study of metallurgical changes and mechanical properties of dissimilar weldments developed by interpulse current TIG welding technique

Yelamasetti¹,

Vardhan²,

Ramana³

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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This research manuscript compares the metallurgical changes and mechanical behavior of AISI 316 and Monel 400 dissimilar weldments developed by Interpulse TIG welding process with ERNiCrMo-3 and ER316 filler wires. Metallurgical aspects are envisioned by using optical and scanning electron microscopes. Mechanical behavior of welded joints were studied by conducting tensile and microhardness tests. Metallurgical study has shown that the ERNiCrMo-3 filler weldment divulged completely with austenitic phase structure at the weld zone. Also, at the HAZ of Monel 400 clear grain boundaries with fine grains were observed. The mechanical properties corroborated that the weld strength of ERNiCrMo-3 weldment was found better than the ER316 weldment. Microhardness on the weldment made of ERNiCrMo-3 filler has shown higher values than that of base metals. Weldment made by ER316 was observed to fail near the interface of Monel 400 under tensile test due to the existence of micro-pores and partially melted zones. Further, the metallurgical and mechanical properties are compared with that of the weldment developed by TIG welding process.

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Thermal fields and residual stresses analysis in TIG weldments of SS 316 and Monel 400 by numerical simulation and experimentation

Cited by 40 publications

References 31 publications

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Numerical investigation on the effect of welding speed and heat input on the residual stress of multi-pass TIG welded stainless steel pipe

Study of metallurgical changes and mechanical properties of dissimilar weldments developed by interpulse current TIG welding technique

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