Method of manufacturing metal pipe with longitudinally different

Details Method of manufacturing metal pipe with longitudinally different Method of manufacturing metal pipe with longitudinally different

1984-08-07

1986-08-05

Godici, Nicholas P.

Metal fusion bonding

Process

With shaping

228144, 138171, 428600, B23K 2802

Patent

active

046038060

ABSTRACT:
First, a rectangular metal plate having thinner and thicker portions corresponding to a lighter-wall portion and heavier-wall portion of a pipe to be manufactured is prepared. Before bending the plate until both edges thereof meet to form a tubular piece, the plate width is adjusted by cutting off part of the thinner portion so that the desired peripheral lengths are attained in both lighter- and heavier-wall portions of the pipe. The width-adjusted plate is then bent until both edges are butted together to form a tubular piece. By butt-welding the adjoining edges, a metal pipe with longitudinally differentiated wall thickness is obtained.

REFERENCES:
patent: 379026 (1888-03-01), Parsons
patent: 653903 (1900-07-01), Bray
patent: 1310130 (1919-07-01), Murray
patent: 1623064 (1927-04-01), Napier
patent: 1978685 (1934-10-01), Mogford et al.
patent: 2104688 (1938-01-01), Adell
patent: 2286971 (1942-06-01), Murray et al.
patent: 4148426 (1979-04-01), Midzutani et al.

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