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Article Dans Une Revue Fusion Engineering and Design Année : 2017

Assessment of HCLL-TBM optimum welding sequence scenario to minimize welding distortions

Olivier Doyen
Nicola Rizzo
  • Fonction : Auteur
Laurent Forest
Noel Thomas
  • Fonction : Auteur
Milan Zmitko
  • Fonction : Auteur

Résumé

The ITER HCLL-TBM (Helium Cooled Lithium Lead Test Blanket Module) box assembly development implies the welding development of the following components: the Box and the Stiffening Grid (SG) made of vertical and horizontal Stiffening Plates (noted respectively v-SP and h-SP). This multi-chamber box structure in EUROFER97 steel is made of plates cooled by multiple meandering channels where circulates pressurized helium. For the assembly of these components, characterized by numerous multipass welds, Gas Tungsten Arc Welding (GTAW) is envisaged as reference process. Moreover, the TBM has large dimensions and thin plates which makes it very sensitive to welding distortions and is problematic regarding the assembly feasibility and compliance with geometric tolerances. This paper presents the numerical simulation and experimental work performed to optimize the v-SP to box assembly sequence, which is the most critical assembly regarding distortions, in order to minimize welding distortions. One of the technical lock of this study is high calculation times needed for this large component which implies to set up a simplified welding simulation method. The study is composed of three main phases: an experimental-numerical study of a T-joint fillet mock-up GTAW used to develop the preliminary welding procedure and to validate a simplified simulation method, a numerical optimization of the v-SP to box welding sequence via the simplified method, and the experimental application of the optimized v-SP to Box welding sequence on the TBM mock-up. The calculation and comparison of four different v-SP to box welding sequences allowed to identify the best sequence regarding welding distortions and to apply it experimentally.
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Dates et versions

hal-03986395 , version 1 (13-02-2023)

Identifiants

Citer

Olivier Doyen, Nicola Rizzo, Laurent Forest, Jérôme Tosi, Noel Thomas, et al.. Assessment of HCLL-TBM optimum welding sequence scenario to minimize welding distortions. Fusion Engineering and Design, 2017, 121, pp.80-86. ⟨10.1016/j.fusengdes.2017.06.015⟩. ⟨hal-03986395⟩
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