Effect of Residual Stresses of GTA Welding for Dissimilar Materials

Harinadh Vemanaboina,Gundabattini Edison,Suresh Akella,Ramesh Kumar Buddu

doi:10.1590/1980-5373-mr-2017-1053

Harinadh Vemanaboina, Gundabattini Edison + Show 2 more

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https://doi.org/10.1590/1980-5373-mr-2017-1053

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Abstract

The purpose of the present work is to understand the evolution of residual stresses in weldments. The study made to weld the multipass dissimilar of Nickel-based superalloy Inconel 625 and stainless steel 316L using Continuous Current Gas Tungsten Arc Welding (CCGTAW) and Pulsed Current Gas Tungsten Arc Welding (PCGTAW) process employing ERNiCrMo-3 and ERNiCr-3 fillers. The L4 orthogonal array was used in the present experimentation process. Analysis of Variance (ANOVA) is applied for the optimization and to identify the critical parameters. In welding process, the size of the lattice size will be stressed due to welding parameters; the lattice dimension is measured by non-destructive technique X-Ray diffraction to investigate residual stress in the weldment in the lateral surface of the plate. X-Ray Radiography test has evaluated the quality of welds. The results show that root gap is a critical parameter and filler wire and weld processes are not critical.

Highlights

Welding of similar or dissimilar materials having individual thermal properties and mechanical properties lead to changes in residual stress and distortion and metallurgical properties
Laser beam welding process has narrow fusion zone and narrower residual stress distribution in weld structures, the butt joints are made for thick plates pre and post weldment vibratory stress relief (VSR) treatment for weldment at low frequency, where this technique was used for reducing the residual stress to 100 MPa10
We have identified parameters: voltage, current, root gap and flow rate as the parameters

Summary

Introduction

Welding of similar or dissimilar materials having individual thermal properties (density, linear expansion, specific heat, conductivity) and mechanical properties (yield strength, Poisson's ratio) lead to changes in residual stress and distortion and metallurgical properties. This causes inhomogeneous plastic deformation leading to defects like distortion and residual stresses in the welded parts. Lei XU7 had discussed weld with K-PAW process for making T-joint with thin plate used for aerospace application and study about the measurement of residual stress using synchrotron X-ray diffraction and FEA.

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