Method of forming seamed metal tube

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

1994-04-25

1995-12-12

Bradley, P. Austin

Metal fusion bonding

Process

With shaping

228 175, 228150, 228231, B23K 3102, B23K10106

Patent

active

054742277

ABSTRACT:
The method of forming a coated seamed metal tube of this invention is particularly, but not exclusively adapted to existing continuous tube forming mills, wherein the tube is formed from a metal strip and welded with the seam located in an upper portion of the tube. In the process of this invention, at least one surface of the strip is coated with a metal coating prior to forming and welding. The tube is then turned to relocate the welded seam in a lower portion of the tube and the lower portion of the tube is then reheated to melt the metal coating and the metal coating then flows downwardly over and coating the welded seam. In the most preferred continuous or in line process of this invention, the tube is continuously spirally twisted following welding to locate the seam in a lower portion of the tube adjacent a heater and the tube is then heated by the heater to the melting temperature of the metal coating, causing the coating to coat the seam.

REFERENCES:
patent: 1848671 (1932-03-01), Sieven
patent: 2575381 (1951-11-01), Colby
patent: 2792490 (1957-05-01), Risch et al.
patent: 3350771 (1967-11-01), Durst
patent: 5035042 (1991-07-01), Maitra et al.

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