Method for mechanical removal of tensile stresses in a tube whic

Details Method for mechanical removal of tensile stresses in a tube whic Method for mechanical removal of tensile stresses in a tube whic

1977-06-21

1979-01-16

Larson, Lowell A.

Metal deforming

Process

Tube making or reshaping

291574, B21D 3908

Patent

active

041342879

ABSTRACT:
A tube which has been expanded in a support such as the tube-sheet of a heat exchanger is subjected to diametral deformation of controlled intensity and direction in the transition zone between the expanded portion of the tube and the portion which has a nominal diameter by means of an axially displaceable and radially expandable tool having a bullet-nosed shape or by means of a tube-expander of the type comprising a mandrel fitted with rollers or by means of a fluid under pressure.

REFERENCES:
patent: 1647447 (1927-11-01), Hartnett
patent: 1951833 (1934-03-01), Maupin
patent: 3956818 (1976-05-01), Hauschke et al.
patent: 3978810 (1976-09-01), Krips et al.

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