Continuous tube forming and coating

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 39/02 (2006.01) B05B 13/06 (2006.01) B05C 3/12 (2006.01) B05C 9/10 (2006.01) B05C 9/12 (2006.01) B05C 9/14 (2006.01) B05C 11/06 (2006.01) B05D 7/22 (2006.01) B21C 37/08 (2006.01) B21C 37/083 (2006.01) B21C 37/09 (2006.01) B21C 51/00 (2006.01) B23K 11/06 (2006.01) B23K 11/16 (2006.01) B23K 13/02 (2006.01) C23C 2/06 (2006.01) C23C 2/18 (2006.01) C23C 2/26 (2006.01) C23C 2/38 (2006.01) C23C 26/02 (2006.01) B05B 9/00 (2006.01)

Patent

CA 2165809

A continuous tube forming and coating process and apparatus, wherein the tube is formed and welded with the seam located at the bottom of the tube and the painted surface on the inside of the tube. An applicator (72) coats the inner surface of the seam following welding preferably in an inert atmosphere. An impeder (54) includes ferrite rods and circulating coolant and a paint applicator tube which extends through the impeder having a nozzle which applies coating over the seam. A galvanizing apparatus having a sealed galvanizing tank (98) which receives the seamed tube below the level of the molten zinc and which is enclosed within a sealed housing and gas pressure in the galvanizing tank is greater than pressure in the housing. The galvanizing apparatus includes inert gas seals (116) which may be also used to as a wiping nozzle.

Appareil de procédé de formage et de revêtement continus de tubes, le tube étant formé et soudé avec la ligne de soudure située à la base du tube et la surface peinte se trouvant à l'intérieur du tube. Un applicateur (72) applique un revêtement sur la surface interne de la ligne de soudure après que la soudure a été effectués de préférence en une atmosphère inerte. Un élément à impédance (54) comprend des bâtonnets de ferrite et un agent refroidissant en circulation, ainsi qu'un tube applicateur de peinture qui s'étend à travers l'élément à impédance et qui comprend un ajutage appliquant le revêtement sur la ligne de soudure. Un dispositif de galvanisation comprend un réservoir de galvanisation (98) hermétiquement fermé qui reçoit le tube soudé au-dessous du niveau du zinc fondu, et qui est enfermé dans un logement étanche, de façon que la pression gazeuse dans le réservoir soit supérieure à celle du logement. Le dispositif de galvanisation comprend des joints d'étanchéité (116) aux gaz inertes, qui peuvent également être utilisés comme ajutages d'essuyage.

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