Spiral Weld Pipe, as the name
implies, is a steel pipe that has a seam running its entire length
in a spiral form.
In the past, due to the method of
manufacture, Spiral Welded pipe was relegated to low pressure and
structural applications. With the development of the Submerged Arc
Welding process, the production of large hot rolled coils of
sufficient width and the development of dependable non-destructive
testing methods, it is now possible to produce Spiral Weld pipe for
high-pressure service.
Present Spiral Weld mills consist of a de-coiling device (in the
case of strip base material) or a plate preparation table (where
the base material is in plate form) a strip connecting welder,
straightening rollers, edge preparation tools (shearing and
trimming), prebending devices, a three roller bending and cage
forming system, an internal welder, an external welder (both
Submerged Arc), ultrasonic testing apparatus and cutting
devices.
The material passes through all these production stages
continuously. The angle between the flat strip being fed into the
machine and the finished pipe leaving the machine controls the pipe
diameter in ratio to strip width and the angle of the weld in the
pipe.
Because of the method of manufacture, a wide variety of diameters
can be produced. The diameter tolerance is small, particularly with
regard to ovality; and the pipe, due to its axial symmetry, has an
inherent straightness. The length range is infinite and is
controlled only by the economics of transportation.
Spiral Weld Pipe is used for dredging, slurry, water and other
pipelines, as well as piling and structural applications.
Spiral Weld Pipe is produced in accordance with the dimensional and
tolerance requirements of various ASTM, AWWA, and API
SSAW Steel Pipe, Spiral Submerged
Arc Welding Steel Pipe, Spiral Steel Pipe, SAWH pipe, helical pipe,
SAW Piling Pipe, Pipe Pile, Water line pipe, Large pipe, long
pipe,API, ASTM, EN, BS,JIS, Steel pipe, Annealing Welded pipe, Cold
drawn, hot rolled, steel tube, Iron pipe, manufacture, mill,
factory, xingang, tianjin, China
Specifications.
The spiral welded pipe machinery
supplied from Germany has an advanced PLC system controlling all
main functions, modified Lincoln automatic DC**-AC tandem submerged
arc welding for both inside and outside which enhances the
productivity and improves the welding quality. The machinery is
equipped with an automatic strip centering system, strip edge
milling and pre—bending system, automatic weld gap control,
automatic centering device for the internal welding, TV camera and
monitor for external welding, digital displays of the main drive
speed(welding speed), an wire feeding speed and a flux
feeding/recovery system, which are sshighly automated for ease of
operation.
