Residual stress in dissimilar metal joints fabricated through both arc welding and powder metallurgy hot isostatic pressing
The United Kingdom Atomic Energy Authority (UKAEA) is carrying out research into nuclear fusion as a future source of clean energy. Fusion reactors are fabricated using an array of joining process. Future fusion reactors will require the joining of many dissimilar metals. Powder Metallurgy Hot Isostatic Pressing (PM-HIP) is an emerging technology capable of near net shape joining of dissimilar metals in a single process step. Unlike arc welding, PM-HIP is a solid-state process which consolidates powder through deformation and joins the powder particles via diffusion bonding. UKAEA are developing this process for fusion relevant steels. One of the key benefits this process theoretically offers is the removal of residual manufacturing stresses which are unavoidable in arc welding. Whilst this is theoretically sound, to the best of our knowledge, it is so far unproven in previous literature. Hence, the aim of this study is to measure and then compare residual stress in dissimilar metal (P91-SS316L) joints fabricated through both arc welding and a PM-HIP manufacture using neutron diffraction.
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AUCOTT lee; Triestino Minniti and PIRLING Thilo. (2021). Residual stress in dissimilar metal joints fabricated through both arc welding and powder metallurgy hot isostatic pressing. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-04-191
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