Methods and systems of joining pipes
AssigneeLincoln Global, Inc.
InventorsBadri Narayanan, John Procario
Life of this patent
Estimating the term…
Abstract
A system and method is provided for joining pipes where a keyhole is formed in each of the pipe ends and then a filler metal is placed in the keyholes to join the pipes to each other. The filler metal can be deposited using a laser hot wire process.
Claims23
A method of forming a joint between a first pipe of a first base material and a second pipe of a second base material, the method comprising:
- disposing the second pipe coaxially within the first pipe to define a pipe joint axis;
- forming at least one keyhole extending at least partially through the first and second pipes with a beam from a first heat source;
- forming a weld metal in the at least one keyhole from a filler wire connected to a power supply;
- rotating the first and second pipes relative the filler wire and the first heat source;
- and
- forming an arc with the wire in the keyhole.
A method of forming a joint between a first pipe of a first base material and a second pipe of a second base material, the method comprising:
- disposing the second pipe coaxially with respect to the first pipe to define a pipe joint axis;
- disposing a sleeve between the first and second pipe so as to interconnect the first and second pipes;
- forming at least one keyhole extending at least partially through a least one of the first pipe and the second pipe and through the sleeve with a beam from a first heat source;
- forming a weld metal in the at least one keyhole from a filler wire connected to a power supply;
- rotating the first pipe, second pipe and sleeve relative the filler wire and the first heat source;
- and
- forming an arc with the wire in the keyhole.
A method of forming a joint between a first pipe of a first base material and a second pipe of a second base material, the method comprising:
- disposing the second pipe coaxially with respect to the first pipe to define a pipe joint axis;
- disposing a sleeve between the first and second pipe so as to interconnect the first and second pipes;
- forming at least one keyhole extending at least partially through at least one of the first pipe and the second pipe and through the sleeve with a beam from a first heat source;
- forming a weld metal in the at least one keyhole from a filler wire heated by a second heat source;
- and
- rotating the first pipe, second pipe and sleeve relative to the filler wire and the first heat source,
- wherein forming the weld metal includes delivering the filler wire to the at least one keyhole so as to maintain the filler wire in continuous contact with a molten puddle in the keyhole.
Dependencies are inferred from the claim text.