Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 157, Issue -, Pages 43-50Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2017.08.004
Keywords
Conduction mode welding; Magnetic beam deflection; Narrow-groove weld; Post-weld heat treatment; Single-sided weld; Welding productivity
Funding
- Engineering and Physical Sciences Research Council through the NNUMAN [EP/J021172/1]
- EPSRC [EP/J021172/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J021172/1] Funding Source: researchfish
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Nuclear pressure vessels are currently fabricated using arc welding processes. Recently, considerable effort has been directed at the development of electron beam welding as an alternative fabrication technique owing to the substantial productivity gains it would offer. However, little attention has been directed at laser-based techniques. In this work we evaluate the potential for applying multipass narrow gap laser welding (NGLW) to the fabrication of nuclear pressure vessels, based on the characterization of a 30 mm thick weld in SA508 steel. Although still a multipass process, the number of passes is reduced in comparison to an arc weld of the same thickness, and the deposition of successive passeS provides a degree of tempering to previously deposited weld metal in away that the electron beam welding process does not. Principal engineering challenges for the implementation of multipass NGLW include the achievement of appropriate joint fit-up, and the shielding of a molten pool at the base of a deep and narrow weld groove. (C) 2017 Published by Elsevier Ltd.
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