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

Harinadh Vemanaboina,Edison Gundabattini,Paolo Ferro,B Sridhar Babu,Kaushik Kumar

doi:10.1155/2021/1028461

Abstract

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.

Highlights

Dissimilar materials combinations such as stainless steels and nickel-based alloys are extensively used in high temperatures and corrosion-resistant applications such as power plants, chemical industries, aerospace, and nuclear applications
Kumar and Shahi [1] reported the effect of heat input in microstructure and mechanical properties of weldments made out of AISI 304, 6 mm thick plates with double V-grooved edge preparation. ree heat inputs have been used for comparison, while the interpass temperature has been maintained equal to about 150°C
Adamczuk et al [2] studied the angular distortion induced by the solidification of fusion zones (FZs) in multipass weldments; 16 mm and 19 mm thick plates were used in the experiments with a variable heat input of 0.06 kJ/mm to 2.5 kJ/mm

Summary

Introduction

Dissimilar materials combinations such as stainless steels and nickel-based alloys are extensively used in high temperatures and corrosion-resistant applications such as power plants, chemical industries, aerospace, and nuclear applications. A welding numerical model was developed by Vemanaboina et al [14, 15] to study the temperature distribution during the process and residual stresses in the weldments produced by GTAW [14] and in multipass dissimilar welding (IN625/SS316L) [15]. In this last work, both constant and pulsed current GTAW processes along with ERNiCrMo-3 and ERNiCr-3 filler rods were used. Distortion and residual stress are measured using the Vernier height gauge and X-ray diffraction technique, respectively

Materials and Experimental Procedure

Results and Discussion

Conclusions