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This research deals with the behaviour of welded joints in modern structural steels of which the high level of mechanical properties is obtained either by accelerated cooling or by quenching and self tempering. For those steels, one can expect that the welding thermal cycle will be superimposed on the process cycle, to induce a super tempering of the treated zone, leading to a softening, which can induce modifications in the fracture behaviour. The performed tests show that the softening is slight for most of the tested grades, and that the fracture behaviour does not depend upon the softening effect if the cooling time is lower than 35 s to 40 s. For some particular grades with high strength and no microalloying element, the softening effect is more important and modifications in fracture behaviour are observed. The role of the weld metal is then pointed out : a weld metal having a moderate strength but high toughness gives better results than the classical overmatching.

Additional information

Authors: DEFOURNY J, Centre de recherches Métallurgiques, Liège (BE);D'HAEYER R, Centre de recherches Métallurgiques, Liège (BE)
Bibliographic Reference: EUR 15590 FR (1996) 69pp., FS, ECU 10
Availability: Available from the (2)
ISBN: ISBN 92-827-6468-0
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