u2.03.05 User manual for numerical welding simulation

Summary

The objective of this document is to provide the information necessary for a user to perform multi-pass welding calculations with*Code_Aster*. It is a methodological guide on the tools available and the good practices to be put in place to conduct a quality study in numerical welding simulation.

The various tips given to the user come essentially from feedback from three studies:

A chamfered 316L pipe welded by the TIG process, with filler metal in thirteen passes (sheet CEA/EDF 3488); the first 2 passes of this example constitute a test case*Code_Aster [V7.42.100]);

A 316L chamfered plate welded by the TIG process, with filler metal in two welding passes (sheet CEA/EDF 2425); the various command files associated with this study are stored in the*Code_Aster study base (SERVICE/BDD Studies);

• A non-chamfered 316L plate, with the creation of a fusion line by the TIG process, but without a filler metal (thesis INSA from Lyon by L. Depradeux defended in 2004).

Table of Contents

• 1. References (IMPORTANT)
• 2. General information on welding
  • 2.1. What is welding?
  • 2.2. Phenomenon involved during welding
  • 2.3. Review of the various interactions
  • 2.4. What do we mean by melt zone, ZAT, revenue zone?
  • 2.5. Why is it important to simulate the welding process?
• 3. Numerical simulation of welding
  • 3.1. Visual representation of a welding operation
  • 3.2. What are we trying to calculate?
  • 3.3. What are the main challenges of simulation?
  • 3.4. The specificities of Code_Aster
• 4. Simulation methodology
  • 4.1. Type of modeling: 2D or 3D?
  • 4.2. The mesh
  • 4.3. Thermal calculation
  • 4.4. Metallurgical calculation
  • 4.5. Mechanical calculation
  • 4.6. Calculation time