Metal fusion bonding – Process – Encasing a rodlike core within a substantially coextensive...
Patent
1988-11-08
1990-05-08
Seidel, Richard K.
Metal fusion bonding
Process
Encasing a rodlike core within a substantially coextensive...
228132, 228245, 138172, 138DIG5, 29446, 2989735, 156165, B23K 3100, B23K 3106
Patent
active
049231081
ABSTRACT:
The strengthening and stiffening of long, curved or tapered tubes is achieved by using internal strengtheners. The strengthening element conforms to the internal shape of the tube as it is inserted into the tube. The parts of the strengthening element which are then in contact with the inside of the tube have pre-formed welding material attached to them; a solid connection between the strengthener and the tube is achieved by selective heating, welding or by blowing adhesive material through the tube.
If a tube has the non-welded strengthener in place, the forming or bending of the tube may proceed, since the strengthener takes the form of the tube at any stage of forming. The process is especially suitable for tubes with different cross-sections along their length.
After the strengthener has assumed its final position within the formed tube, a rotational prestress or torque applied to the strengthener before welding is a means of prestressing the tube in one helical direction, which is followed by the welding step. In a long tube, after the strengthener has assumed its final position within the tube, the strengthener can be longitudinally prestressed while the tube is formed, thus providing a longitudinally prestressed tube after the welding step. The channels created by the welding process may be used to transmit fluids or gases.
REFERENCES:
patent: 724909 (1903-04-01), Maxwell
patent: 908127 (1908-12-01), Passmore
patent: 1442160 (1923-01-01), Lachman
patent: 1472518 (1923-10-01), Gillette et al.
patent: 1677714 (1928-07-01), Frease
patent: 3110753 (1963-11-01), Witort
Heinrich Samuel M.
Seidel Richard K.
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