IDENTIFICATION OF THERMAL BOUNDARY CONDITIONS AND THERMO-METALLURGICAL BEHAVIOUR OF X10CrMoVNb9-1 STEEL DURING SIMPLE TIG WELDING TESTS

Guilhem Roux (1) , René Billardon (2)

1 DTCH - Département Thermique Conversion et Hydrogène
2 LMT - Laboratoire de Mécanique et Technologie

To validate the thermo-metallurgical models that are used during finite element simulations of multi-pass TIG welding, two simple experiments – called "disk-spot" and "disk-cycle" TIG welding tests- have been designed. A procedure has been developed to identify the thermal boundary conditions that are imposed to the specimen during these experiments. These boundary conditions include the heat source that is equivalent to the TIG torch as well as the heat flux by convection (-radiation) at the surface of the specimen. A thermo-metallurgical model has been built and identified to represent most important phase changes occurring in a X10CrMoVNb9-1 martensitic steel –also known as ASTM A387 or T91 steel- during the welding process. The results of the thermo-metallurgical analysis of a "disk-spot" TIG mono-pass welding test without metal deposit is compared with experimental observations.

Domaines: Matériaux

Guilhem Roux, René Billardon. IDENTIFICATION OF THERMAL BOUNDARY CONDITIONS AND THERMO-METALLURGICAL BEHAVIOUR OF X10CrMoVNb9-1 STEEL DURING SIMPLE TIG WELDING TESTS. 8th International Seminar Numerical Analysis of Weldability, Sep 2006, Seggau, Austria. pp.341-352. ⟨hal-00437218⟩