Joint and process for forming same

Details Joint and process for forming same Joint and process for forming same

1975-03-13

1976-09-28

Lanham, C. W.

Pipe joints or couplings

For plural component line

Metal and elastomeric layers

285329, 2853824, 294205, 29523, F16L 4100

Patent

active

039827780

ABSTRACT:
The invention is concerned with an improved joint between tubing and a flange having a hole therethrough into which the tubing is force-fit. The flange is made of powdered metal by placing the powdered metal and a lubricant in a mold, compressing the powdered metal at a pressure of at least about 4 .times. 10.sup.7 Kg. per sq. meter, removing the resulting flange from the mold, initially heaing it in an inert or reducing gas atmosphere to remove the lubricant, heating it further at a higher temperature to cause intermetallic bonding thereof, cooling it to a temperature below about 100.degree.C and dry machining annular channels into the hole in the resulting flange. The joint is formed by placing the tubing within the hole and expanding the tubing outwardly into the channels which extend from the hole. The resulting joint has a much higher resistance to torque than does a similar joint made between tubing and a machined flange of similar or even greater hardness. The invention is further concerned with a process for forming said joint.

REFERENCES:
patent: 295593 (1884-03-01), Thayer
patent: 2252274 (1941-04-01), Rossheim et al.
patent: 2754577 (1956-07-01), Maxwell
patent: 2913819 (1959-11-01), Andreotti et al.
patent: 2983660 (1961-05-01), Loeb et al.
patent: 3018547 (1962-01-01), Marskell
patent: 3290124 (1966-12-01), Holtzclaw, Jr.
patent: 3834003 (1974-09-01), Nayar

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