Method for manufacturing welded pipes

Details Method for manufacturing welded pipes Method for manufacturing welded pipes

1987-06-30

1990-04-17

Rowan, Kurt

Metal fusion bonding

Process

With shaping

B23K 3106

Patent

active

049168533

ABSTRACT:
In the manufacture of welded pipes, edge buckling or waving of the strip is prevented by heating. In one method, during the process for bending the strip into a tubular form, the edges of the strip are heated so that tensile stress exerted thereon is reduced to a minimum and, thereafter, before the edges are abutted against each other, the strip is wholly heated so that the compressive stress exerted on the edges is reduced to a minimum. According to another mode, during the process for bending the strip gradually into a tubular form or during the process in which the edges of the strip are held in abutment against each other, the strip except its portions of the edges is substantially or partially heated so that the strip except its portions of the edges is subjected to compressive stress while the portions of the edges are subjected to tensile stress, and under these conditions the edges are welded together.

REFERENCES:
patent: 1960523 (1934-05-01), Anderson
patent: 2666831 (1954-01-01), Seulen et al.
patent: 2673274 (1954-03-01), Vaughan et al.
patent: 2977914 (1961-04-01), Gray et al.
patent: 3127674 (1964-04-01), Kohler
patent: 4460118 (1984-07-01), Ataka

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