Ribbed sheet metal casing, in particular bodywork of a rotating electrical machine

The invention relates to a ribbed sheet metal casing, in particular the bodywork of a rotating electrical machine, including on its outer periphery cooling ribs 2 which are formed by compressed folds of the said metal sheet. The fold elbows positioned at the lower ends of the ribs are jointed together by a discontinuous longitudinal weld 5, the individual elements of the weld having a length of between 1 and 50 mm, preferably between 5 and 10 mm, and the distance between the ends of adjacent weld elements is between 1 and 200 mm, preferably between 50 and 70 mm, the weld elements 5 being positioned in planes perpendicular to the longitudinal axes of the ribs 2. L'INVENTION CONCERNE UN CARTER EN TOLE METALLIQUE NERVUREE, NOTAMMENT UNE CARCASSE D'UNE MACHINE ELECTRIQUE TOURNANTE, COMPORTANT SUR SA PERIPHERIE EXTERIEURE DES NERVURES DE REFROIDISSEMENT 2 QUI SONT FORMEES PAR DES PLIS COMPRIMES DE LADITE TOLE METALLIQUE.LES COUDES DE PLIAGE PLACES AUX EXTREMITES INFERIEURES DES NERVURES SONT JOINTS ENSEMBLE PAR UNE SOUDURE LONGITUDINALE DISCONTINUE 5, LES ELEMENTS INDIVIDUELS DE LA SOUDURE AYANT UNE LONGUEUR COMPRISE ENTRE 1 ET 50MM, DE PREFERENCE ENTRE 5 ET 10MM, ET LA DISTANCE ENTRE LES EXTREMITES D'ELEMENTS DE SOUDURE ADJACENTS EST COMPRISE ENTRE 1 ET 200MM, DE PREFERENCE ENTRE 50 ET 70MM, LES ELEMENTS DE SOUDURE 5 ETANT PLACES DANS DES PLANS PERPENDICULAIRES AUX AXES LONGITUDINAUX DES NERVURES 2.