Method and apparatus for the heat treatment of welds

Details Method and apparatus for the heat treatment of welds Method and apparatus for the heat treatment of welds

C - Chemistry, Metallurgy

21

D

C21D 1/42 (2006.01) B23K 26/42 (2006.01) C21D 9/50 (2006.01) H05B 6/02 (2006.01)

Patent

CA 2670142

To improve and further develop the heat treatment of the weld and the joining weld regions (6, 7) before and behind the actual welding by means of a laser, which is carried out during welding of steel sheets (2) to minimize the risk of crack formation or alteration of the microstructure in the region of the weld, it is proposed according to the invention that the heating of the region of the weld (6, 7) be carried out by means of a multiply stepped line inductor (4, 5) which can be set in a defined way and has zones of different power densities and is configured with a multiple division of its conductor loop lengths and/or with different plating of the conductor loops and/or with a plurality of spacing steps from the steel strip (2). Here, a steeper temperature rise occurs in the first heating stage than in the subsequent heating stage.

Pour améliorer le traitement thermique du cordon de soudure et des zones (6, 7) adjacentes au cordon de soudure avant et après le soudage proprement dit au laser, ledit traitement étant réalisé en vue de minimiser le risque de formation de fissures ou de modifications du réseau dans la zone du cordon de soudure lors du soudage de tôles d'acier (2), l'invention propose de réaliser le chauffage de la zone (6, 7) du cordon de soudure au moyen d'un inducteur linéaire (4, 5) multi-étagé, réglable de manière définie, doté de zones à différentes densités de puissance et configuré avec une division multiple des longueurs de ses boucles conductrices et/ou différentes tôleries des boucles conductrices et/ou plusieurs étages différents de distance par rapport au feuillard d'acier (2). On obtient ainsi lors de la première étape de chauffage une montée plus rapide de la température que dans les étages de chauffage qui suivent.

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