Method of explosively forming bi-metal tubeplate joints

Details Method of explosively forming bi-metal tubeplate joints Method of explosively forming bi-metal tubeplate joints

1980-05-27

1982-06-08

Hampilos, Gus T.

Metal fusion bonding

Process

Using explosive energy

228109, 228183, B23K 2008

Patent

active

043335977

ABSTRACT:
A tubejoint for a heat exchanger made of two dissimilar materials is provided wherein the tubeplate joint is manufactured by use of an explosive having a detonation velocity more than 120 percent of the sonic velocity of the tube materials to be welded. Very satisfactory welds are formed at subsonic velocity between the surfaces of concentric tubes made of dissimilar metal and along the surface of a counterbore formed in the hole in which the composite tube is placed. The joint thus formed prevents any corrosive fluid on the tube side of the joint from coming in contact with any non-compatible material on the shell side of the heat exchanger and also prevents any corrosive fluid on the shell side of the heat exchanger from coming in contact with incompatible material on the tube side of the heat exchanger. In the joint construction, a thimble made of the same material as the inner tube and as a clad layer on the tube side of the tubeplate is welded both to the tubeplate and to the inner tube to prevent any passage of fluid therethrough from the tube side to the shell side. A mechanical joint is formed on the shell side to prevent passage of fluid from the shell side through the aperture in the tubeplate to the tube side.

REFERENCES:
patent: 3233312 (1966-02-01), Cowan et al.
patent: 3503110 (1970-03-01), Berry et al.
patent: 3717925 (1973-02-01), Hardwick
patent: 3813758 (1974-06-01), Araki

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