초록 ▼

A method of cladding the ends of a length of previously clad pipe with a clad of greater thickness than the clad for the balance of the length in order to allow for threading, including the steps of boring, facing and turning the end of the pipe, plating by electroless deposition the faying surfaces

A method of cladding the ends of a length of previously clad pipe with a clad of greater thickness than the clad for the balance of the length in order to allow for threading, including the steps of boring, facing and turning the end of the pipe, plating by electroless deposition the faying surfaces of a nickel-base alloy cladding cylinder, assembling the cylinder to the length of pipe, assembling a close fitting tooling mandrel on the inside of the cladding cylinders, the tooling mandrel being made of a metal possessing a higher coefficient of thermal expansion than does the pipe, placing the subassembly within a housing having an induction coil therein, evacuating the housing atmosphere and back filling with an inert gas such as argon, heating the subassembly to about 1650°to 2100°F., thereby melting the nickel base alloy and expanding the mandrel diameter more than the subassembly diameter to obtain necessary pressure to eliminate fit-up gaps thereby metallically bonding the cladding member to the end of the pipe by means of the mechanism of liquid interface diffusion bonding.

대표청구항 ▼

A method of internally cladding a tubular product, an enlarged diameter upset end portion comprising: (a) positioning a tubular cladding member within the upset end portion of the tubular product, the cladding member having a plating of low melting point bonding metal alloy on the external tubular s

A method of internally cladding a tubular product, an enlarged diameter upset end portion comprising: (a) positioning a tubular cladding member within the upset end portion of the tubular product, the cladding member having a plating of low melting point bonding metal alloy on the external tubular surface thereof; (b) positioning a cylindrical mandrel within said tubular cladding member, the mandrel having a coefficient of thermal expansion greater than said tubular product upset end,; (c) positioning an induction coil around the tubular product upset end; (d) sequentially evacuating the space between the exterior of said cladding member and the interior of said upset end of said tubular product and charging it with an inert gas, the sequence being carried on to substantially remove all the water and oxygen and leave the space filled with inert gas with the level of water and oxygen being below a dew point of about -60°; (e) heating said tubular product upset end, said cladding member and said mandrel to about 1,650°F. to 2,100°F. to metallically bond said cladding member to said tubular product upset end.