Method for processing welded metalwork joints by...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 7/06 (2006.01) B21D 1/00 (2006.01) C21D 7/04 (2006.01) C21D 10/00 (2006.01) C21D 9/50 (2006.01)

Patent

CA 2450369

The inventive method relates to reinforcing treatment of welded metalwork joints using a power ultrasound. Said method can be used for mechanical engineering, shipbuilding, bridge engineering and other branches of industry and construction producing welded structures which can be safely used at conditions of static, dynamic and repeated-variable loading. The inventive method consists in specifying the method for calculating normalised residual compressive stresses to be produced by an ultrasound impact processing. Said stresses are related to the geometrical dimensions of a groove formed when the area disposed along a line between the joint and a base metal is treated. Said invention makes it possible to maximally increase the fatigue limit and the cyclic life duration of welded joints.

Cette invention porte sur un procédé permettant d'améliorer le traitement de joints soudés de structures métalliques effectué à l'aide d'ultrasons puissants. L'objet de cette invention peut être utilisé dans les domaines de la construction automobile, de la construction navale, de la construction de ponts ainsi que dans d'autres domaines de l'industrie et de la construction, relatifs à la production et au besoin d'une utilisation sans danger de structures soudées, qui fonctionnent dans des conditions de chargement statique, dynamique et de changements répétés. Ce procédé consiste à calculer les contraintes de compression résiduelles normalisées qui sont nécessairement générées lors d'un traitement à percussions à ultrasons. Ces contraintes sont liées aux dimensions géométriques d'une rainure formée lors du traitement de la zone située sur une ligne entre le joint et un métal de base. Cette invention permet d'accroître au maximum la limite de la résistance ainsi que la durée de vie cyclique des joints soudés.

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