Finite element modeling of the effect of welding parameters on solidification cracking of Austenitic Stainless Steel 310

Eslam Ranjbarnodeh,Hamed Sabet,Yashar Gheisar Anzabi

doi:10.30544/222

Eslam Ranjbarnodeh, Hamed Sabet + Show 1 more

Open Access

https://doi.org/10.30544/222

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Abstract

A transient thermo-mechanical model is employed to study the effects of welding parameters on the occurrence of solidification cracking. A finite element program, ANSYS, is employed to solve the thermal and mechanical equations while the different variables such as welding current, speed and sequence are considered in the simulation. The studied geometry was butt joint of two stainless steel plates with the thickness of 2 mm. Then, the samples were welded by TIG method without filler. To verify the numerical results, the model outputs were checked with the experimental observations and good agreement was observed. It was found that the increasing of welding current from 70 A to 100 A resulted in the increase in transverse tensile strain from 1.2 to 2.1 which can facilitate the occurrence of solidification cracking. Furthermore, the application of symmetric welding layout is an effective method to prevent solidification cracking.

Highlights

Austenitic stainless steels are widely used in oil, gas and petrochemical industries
The present study develops a 3-D transient thermo-elastic-plastic model for the calculation of transient thermal strain during TIG welding process using ANSYS software to predict the effects of welding parameters and sequence on the occurrence of the solidification cracking by BTR diagrams
As the heat input of the welding is enhanced, the thermal strains are increased resulting in more sensitivity to the occurrence of solidification cracking, 2

Summary

Introduction

Austenitic stainless steels are widely used in oil, gas and petrochemical industries. These kinds of steels have higher contents of chromium (Cr) and nickel (Ni) in order to have austenitic structure. The weldability of these steels is determined by various parameters like sensitivity to solidification cracking [1]. 237-250 efficiency and more utilization of raw material The prediction of this phenomenon allows controlling the welding process and its prevention can accelerate the welded structures production and improve the production efficiency [2]. The control of Creq/Nieq ratio (Matsuda’s method; Fig. 1) is a method to prevent solidification cracking [1]

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