Method of forming seamed metal tube

Details Method of forming seamed metal tube Method of forming seamed metal tube

B - Operations, Transporting

21

C

B21C 37/08 (2006.01) B05B 13/06 (2006.01) B05C 3/12 (2006.01) B05C 9/10 (2006.01) B05C 9/12 (2006.01) B21C 37/083 (2006.01) B21C 37/09 (2006.01) B23K 11/06 (2006.01) B23K 11/16 (2006.01) B23K 13/02 (2006.01) B23K 13/06 (2006.01) C23C 2/26 (2006.01) C23C 26/02 (2006.01)

Patent

CA 2214519

A method of forming a seamed metal tube (20c) having a metal coating (56) on at least an inside surface of the tube (20c) from a continuously moving, relatively flat metal strip (20a) is disclosed. The primary feature of the inventive process is the step, after forming and welding the seamed metal tube (20c), of locating the seam in a lower portion of the tube (20c) and reheating at least that lower portion of the tube (20c) to melt the coating (56). The coating (56) is thereby caused to flow downwardly over and to coat the inner surface of the seam. The result is a seamed tube (20c) with a more corrosion resistant seam region.

L'invention décrit un procédé visant à former un tuyau métallique soudé (20c) recouvert d'un revêtement métallique (56) sur au moins une face intérieure du tuyau (20c) à partir d'une bande de métal (20a) relativement plate avançant en continu. La première caractéristique du procédé de l'invention est l'étape consistant, après formage et soudage du tuyau métallique soudé (20c), à placer la soudure dans une partie inférieure du tuyau (20c) et à réchauffer au moins ladite partie inférieure pour faire fondre le revêtement (56). On provoque ainsi l'écoulement vers le bas du revêtement (56) sur la face intérieure de la soudure, donc le recouvrement de celle-ci par le revêtement. Le résultat est un tuyau soudé (20c) ayant une zone de soudure plus résistante à la corrosion.

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