초록 ▼

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

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.

대표청구항 ▼

A method of explosively bonding two cylindrical parallel members to each other and to a body defining a conical anvil surface through which they extend, including the steps of: positioning an inner metallic tube within an outer metallic tube in contiguous parallel relationship; placing an outer end

A method of explosively bonding two cylindrical parallel members to each other and to a body defining a conical anvil surface through which they extend, including the steps of: positioning an inner metallic tube within an outer metallic tube in contiguous parallel relationship; placing an outer end of the tubes within a body defining an aperture having a conical anvil surface sloping away from a surface of the outer tube at one side of the aperture; providing an explosive charge having a detination velocity greater than 120% of the sonic velocity of the metallic tube with the greater sonic velocity within the inner tube extending substantially the length of the conical anvil surface; and igniting the explosive charge at an inner end within the tubes causing the inner tube to progressively expand and be driven against the outer tube along a collision point moving at supersonic velocity toward the outer end of the tubes to expand the outer tube until it strikes the anvil surface resulting in a first pressure point moving at subsonic velocity as the outer tube strikes the anvil surface and a second pressure point moving at subsonic velocity as the inner tube impacts against the now stationary outer tube creating a weld between the surfaces of the anvil and the outer tube and between the surfaces of the outer tube and the inner tube.