Device for stopping a leak in a straight portion of a heat-excha

Details Device for stopping a leak in a straight portion of a heat-excha Device for stopping a leak in a straight portion of a heat-excha

1979-05-11

1981-08-11

Reynolds, B. A.

Electric heating

Metal heating

Of cylinders

219 67, 219119, 2940216, 165 76, B23K 3106, B22D 1910, B23K 1130, F28F 1106

Patent

active

042836158

ABSTRACT:
An axial mandrel having good electrical conductivity is fitted with conical metal washers and insulating pastilles in alternate sequence. A nut applied against an insulating support at the lower end of the mandrel exerts a compressive stress on the washers, the peripheral edges of which are applied against a lining sleeve placed within a leaky portion of a heat-exchanger tube. Each washer thus exerts a radial force which applies the sleeve in intimate contact with the tube along a number of circular lines corresponding to the number of washers. An electric current is passed through the mandrel, the washers, the lining sleeve, thus uniting the tube and the lining sleeve by means of circular resistance welds.

REFERENCES:
patent: 2883517 (1959-04-01), Rice et al.
patent: 3239645 (1966-03-01), Monroe
patent: 3781966 (1974-01-01), Lieberman
patent: 3962767 (1976-06-01), Byerley et al.
patent: 4028789 (1977-06-01), Loch

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