Session: MF-03-02 Welding Residual Stress and Distortion Simulation and Measurement - 2

Paper Number: 106309

106309 - An Experimental and Numerical Modelling for Smaw 

This paper deal with the numerical welding simulation of a SMAW mock-up. The specific stepped 20MND5 ferritic steel grade mock-up has a rectangular shape with a groove of 30 mm depth The groove is filled by a coated electrodes welding process using a multipass methodology (9 layers). In order to monitor the welding conditions as precisely as possible, temperature gradient within the mock-up base material, the interpass temperature, and the outline evolution of the mock-up and the chamfer are recorded bead after bead during the manufacturing process.  To complete the input data available for the simulation and assist its validation, extensive characterization, including hardness mapping, micrographs as well as residual stress measurement, were conducted.

The welding simulation is performed using the finite element software SYSWELD^TM. First a thermo-metallurgical simulation is performed (bead by bead following the welding sequence). The heat input is described by an equivalent heat source fitted thanks to experimental data (thermocouples, molten zone and heat affected zone). The metallurgical transformations are also taken into account during the simulation. Then, a mechanical simulation is performed using the thermal and metallurgical state calculated previously to estimate the induced distortion and residual stresses of the process.

In this paper, the experimental mock-up and the experimental data are described in a first part. The numerical welding simulation and the hypothesis used are explained in a second part. Then, in the last part, the experimental and simulation results are compared and discussed in term of temperature, metallurgical phases, distortions and residual stresses.

Presenting Author: Sebastien Gallee FRAMATOME

Presenting Author Biography: PH-D in Mechanics and Materials.
Work 15 years for ESI-France in numerical welding simulation (nuclear industry, automotive, transportation, aerospace).
Work for Framatome since 2022 in numerical simulation of process, especially welding simulation.

Authors:

Sebastien Gallee FRAMATOME
Florence Gommez FRAMATOME
Nicolas Sallez FRAMATOME
Alexandre Brosse FRAMATOME