Pressure-differential method for sleeve-to-tube joining

Details Pressure-differential method for sleeve-to-tube joining Pressure-differential method for sleeve-to-tube joining

1984-12-28

1986-03-18

Albritton, C. L.

Electric heating

Metal heating

For bonding with pressure

219 85BM, B23K 104

Patent

active

045770840

ABSTRACT:
The pressure-differential method for sleeve-to-tube joining comprises inserting a sleeve within a tube and joining the sleeve to the tube. An internal heating device is then inserted into the sleeve for bonding the sleeve to the tube. The portion of the sleeve to be joined is then sealed so that the portion of the sleeve to be joined may be internally pressurized. Once the sleeve has been so pressurized, the heating operation may be begun. In the case of welding, as the welding progresses the molten weld pool under the arc is continuously driven by the internal pressure gradient toward the external tube. In this manner the arc force is cushioned by the molten pool at all times thus preventing the weld arc from piercing through the sleeve. In the case of brazing, as the heating progresses the sleeve becomes more pliable such that the internal pressure causes the sleeve and braze material to closely contact the inner surface of the tube.

REFERENCES:
patent: 3754115 (1973-08-01), Roberts et al.
patent: 4448343 (1984-05-01), Kochka et al.

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