Process for producing copper-brazed double wall steel tubes...

B - Operations – Transporting – 21 – C

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B21C 37/09 (2006.01)

Patent

CA 2699249

The invention is the production process for the metal tube (1) with at least two walls, wherein the copper is coated onto the steel sheet layer (1.1) by means of the electrolysis method, two wall tube (1) is obtained from the obtained sheet layer (1.1) with copper layer (1.2), the obtained two wall tube (1) is permitted to reach the brazing temperature, then it is heated at the brazing temperature and is joined by means of copper braze heated up to the occurrence of the optimum brazing, said invention being related to cooling the tube (1) by providing its contact with air along the elongation line (A) and the annealing line (T) by means of the annealing line (T) being integrated with the elongation line (A).

L'invention porte sur un procédé de fabrication d'un tube de métal (1) ayant au moins deux parois, selon lequel le cuivre est revêtu sur la couche de tôle d'acier (1.1) au moyen d'un procédé d'électrolyse, un tube à deux parois (1) est obtenu à partir de la couche de tôle obtenue (1.1) avec la couche de cuivre (1.2), le tube à deux parois obtenu (1) est autorisé à atteindre la température de brasage, puis est chauffé à la température de brasage et est lié au moyen d'une brasure au cuivre chauffée jusqu'à l'apparition du brasage optimal. L'invention concerne également le refroidissement du tube (1) par son contact avec de l'air le long d'une ligne d'élongation (A) et de la ligne de recuit (T), la ligne de recuit (T) étant intégrée avec la ligne d'élongation (A).

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