Optimising residual stresses at a repair in a steam header to tubeplate weld |
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| Affiliation: | 1. British Energy Generation Ltd, Barnett Way, Barnwood, Gloucester GL4 3RS, UK;2. Mitsui Babcock, Porterfield Road, Renfrew PA4 8DJ, UK;3. Frazer-Nash Consultancy Limited, Stonebridge House, Dorking Business Park, Dorking RH4 1HJ, UK;1. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;2. Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;3. Institute of Pulsed Power Science, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan;1. ShenHua GuoHua (Beijing) Electric Power Research Institute, Beijing 100025, China;2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;1. Department of Mechanical Engineering, University of Bristol, Bristol BS8 1TR, UK;2. Rolls Royce, plc, Derby, UK;3. Veqter Ltd, UK;1. Department of Mechanical Engineering, University of Bristol, Bristol, UK;2. School of Engineering and Innovation, The Open University, Milton Keynes, UK |
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| Abstract: | Following the discovery of incorrect weld metal in the steam side shell to tubeplate weld in a type 316H stainless steel superheater steam header, a repair strategy had to be determined. The strategy adopted was to remove the incorrect weld material, which extended around the full circumference, by machining from the inside of the header, followed by rewelding from the inside using an automatic welding process and localised post-weld heat treatment. Due to concern over potential reheat cracking of the repair after return to service, a considerable amount of residual stress modelling was carried out to support the development and optimisation of a successful repair and heat treatment strategy and thus underwrite the safety case for return to service. |
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