Method and apparatus for coating the seams of welded tubes

B - Operations – Transporting – 05 – B

Patent

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Details

B05B 13/06 (2006.01) B05B 7/14 (2006.01) B23K 13/02 (2006.01)

Patent

CA 2377699

The method for coating the seam of a welded tube (20) of this invention includes applying a mixture of the desired protective metal coating in powdered form and a liquid flux over the internal surface of the welded seam with the welded seam located in a lower portion of the tube, then heating the welded seam to the melting temperature of the protective metal coating, melting the metal coating which flows over the seam forming an adherent metallurgical bond. The preferred apparatus includes a wand (86) which extends between the opposed edges (24) of the open seam tube in the welding apparatus and extends axially through the tube to overlie the welded seam spaced from the welding apparatus. The wand includes three conduits transmitting the powdered protective metal coating (88), liquid flux (94), and nonoxidizing gas (38) to the applicator which includes a nozzle (58) which atomizes and sprays the liquid flux over the internal surface of the seam and which combines with the powdered protective metal coating to form a paste. The preferred heating apparatus includes a first induction heater (100) adjacent the seam which preheats the seam and a full body coil (102) which heats the entire tube.

Procédé destiné à appliquer un revêtement sur la soudure d'un tube soudé (20), qui consiste à appliquer un mélange du revêtement métallique protecteur désiré sous forme de poudre et un flux de liquide sur la surface interne de la soudure, ladite soudure étant placée au niveau d'une partie inférieure du tube, à chauffer la soudure à la température de fusion du revêtement métallique protecteur, à faire fondre le revêtement métallique qui s'étale sur la soudure et forme ainsi une liaison métallurgique par adhésion. L'appareil préféré comporte une perche (86) qui s'étend entre les bords opposés (24) du tube à bords simplement rapprochés et s'étend axialement dans le tube pour se trouver sur la soudure. La perche comporte trois conduits qui transmettent le revêtement métallique protecteur en poudre (88), le flux de liquide (94) et le gaz non oxydant (38) à l'applicateur, ce dernier possédant une buse (58) qui atomise et pulvérise le flux de liquide qui se combine avec le revêtement métallique protecteur. L'appareil de chauffe préféré comporte un premier dispositif de chauffe par induction (100) adjacent à la soudure, destiné à préchauffer la soudure, et un bobinage (102) entourant complètement le tube, destiné à chauffer l'intégralité du tube.

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