Method of producing bellows from metal alloys

Details Method of producing bellows from metal alloys Method of producing bellows from metal alloys

1981-06-29

1983-01-18

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12E, 148 12EA, C21D 908

Patent

active

043690742

ABSTRACT:
A method of producing bellows from metal alloys comprises reeling a tubular workpiece to reduce the wall thickness thereof under volume deformation, heating the reeled tubular workpiece at a rate of 100 to 800.degree. C. per sec by passing electric current therethrough up to a temperature exceeding the recrystallization of the alloys, and cooling the heated tubular workpiece. Thereafter, the tubular workpiece wall is locally deformed in a transverse direction to form annular grooves thereon, and then corrugations are made by plastically deforming the tubular workpiece under axial compression and under excessive internal pressure produced therein. Thus obtained corrugated workpiece is heated by passing electric current therethrough at a rate of 25 to 100.degree. per sec up to a temperature at which finely dispersed phases of the alloy precipitate at a maximum rate, and held at the above temperature for 0.5 to 120 min.

REFERENCES:
patent: 3774431 (1973-11-01), Stromblad et al.
patent: 4202708 (1980-05-01), Bates et al.

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