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Final report on Contract No 7210-PR/109, 1 July 1998 to 30 June 2001.

Two ways of productivity improvement in the welding of structural steels have been explored during this research. The first takes advantage of the newly developed, high-density energy techniques, such as laser welding. A large number of commercial and laboratory-melted steels (8-25mm thick) were selected and laser welded. Charpy V, CTOD, impact tensile tests were used to characterise weld toughness. Toughness improvement was achieved by a mixed microstructure composed of martensite plus bainite, and a further amelioration was obtained when acicular ferrite was also present. This optimal hardenability can be achieved, in particular, through careful carbon selection. Toughness improvement was also obtained with Ti oxides and Ni additions via filler materials. The second part of the research focused on the development of steels with fine HAZ microstructures. These can be obtained by local straining around certain 'efficient' particles, by differential dilatation with austenite matrix during cooling in welding. In particular, Ti-complex oxides associated to MnS are efficient for fertile nucleation. Laboratory or industrial steels containing this type of efficient particles have been successfully derived.

Additional information

Authors: KAPLAN D, IRSID, Maizières-lès-Metz (FR);HARRISON P L, Corus UK Ltd, Rotherham (UK);FERSINI M, CSM, Rome (IT);MATERA S, CSM, Rome (IT);WELDING J, Force Institute, Brondby (DK);KRISTENSEN J K, Force Institute, Brondby (DK)
Bibliographic Reference: EUR 20507 EN (2002), pp.252. Euro: 38.00
Availability: EUR-OP reference: KI-NA-20507-EN-C Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4490-8
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