RT Conference Proceedings
T1 Assessment of residual stresses in ITER CS helium inlet welds fatigue tested at cryogenic temperature
A1 Sgobba, Stefano
A1 Avilés Santillana, Ignacio
A1 Langeslag, Stefanie A. E.
A1 Fernández Pisón, María del Pilar
A1 Castillo  Rivero, S.
A1 Libeyre, P.
A1 Jong, C.
A1 Everitt, D.
A1 Freudenberg, K.
AB The ITER Central Solenoid (CS) consists of six independent wound modules. The cooling of the cable-in-conduit conductor is assured by a forced flow of supercritical He at 4.5 K supplied by He inlets located at the innermost radius of the coil. The inlets consist of a racetrack-shaped boss welded to the outer conduit wall through a full penetration Tungsten Inert Gas (TIG) weld. They are critical structural elements submitted to severe cyclic stresses due to the electro-magnetic forces acting on the coils. The weld contour is shape-optimised and locally processed by Ultrasonic Shot Peening (USP), conferring large compressive residual stresses on a subsurface layer of several millimetres thickness to improve fatigue strength. The distribution of the residual stresses and the effect of USP on microstructure and mechanical properties is assessed, with reference to the results of a cryogenic fatigue test campaign, performed on peened and as-welded inlets for comparison.
PB IOP Publishing Ltd.
SN 1757-8981
YR 2019
FD 2019-06
LK https://hdl.handle.net/10016/31657
UL https://hdl.handle.net/10016/31657
LA eng
NO Proceeding of: 27th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2018 (ICEC-ICMC 2018), September 3-7, 2018, Oxford, United Kingdom
DS e-Archivo
RD 30 jun. 2024