Spiral tube
Spiral pipe is also called the spiral steel pipe or spiral welded
pipe, is the low carbon structural steel and low alloy steel strip
according to certain helix Angle (called forming Angle) rolled into
a tube blank, and then welded pipe joints made up, it can use a
narrow strip in the production of large diameter steel pipe.Major manufacturing technology is a double-sided submerged arc
welding, spiral pipe is mainly used in oil, natural gas pipeline,
its specification in diameter * wall thickness.Spiral pipe has one side welding and welding by both sides, welded
pipe shall ensure that the water pressure test, the tensile
strength and cold bending properties of the weld in accordance with
regulations.
Characteristics of spiral pipe: straight seam welded pipe
production technology is simple, high production efficiency, low
cost, rapid development.The strength of the spiral welded pipe is generally higher than
straight seam welded pipe, use a narrow billet production of larger
diameter welded pipe, you can also use the same width of billet in
the production of different pipe diameter welded pipe.Liaocheng city jia bin supply spiral pipe steel pipe co., LTD.But compared with the same length of straight seam pipe, weld
length by 30 ~ 100%, and the production speed is low.As a result, a small diameter welded pipe are mostly with straight
seam welding, large diameter welded pipe for the most part adopts
spiral welded.
Now commonly used standards of the spiral pipe can be divided into:
the SY/T5037-2000 (solid, also known as the common fluid conveying
pipe with spiral seam submerged arc welding steel pipe),
GB/T9711.1-1997 (national standard, also known as oil and gas
industry conveying pipe delivery technical conditions in the first
part: grade A steel tube strict (so far have GB/T9711.2 grade B
steel pipe)), API 5 l (American petroleum institute, also known as
the pipeline steel pipe; which can be divided into PSL1 and PSL2
two levels), SY/T5040-92 (pile with spiral seam submerged arc
welding steel pipe).
classification
Pressurized fluid conveying with spiral seam submerged arc welding
pipe is mainly used for conveying oil, natural gas pipeline, pipe
pressure ability strong, good plasticity, easy to welding and
processing molding;Generally low pressure fluid conveying spiral seam submerged arc
welding steel pipe adopt double automatic submerged arc welding or
welding by one side into the legal system for water, gas, air and
steam general low-pressure fluid conveying with submerged arc
welding steel pipe.
The production process
1) raw material namely strip coil, wire, flux.Have to pass strict physical and chemical inspection before
investment.
2) strip head to tail docking, use single or double wire submerged
arc welding, after rolled steel tube adopts automatic submerged arc
welding repair welding.
3) before forming, strip after flattening, cutting edge, edge
planing, transmission and cleaning the surface to the flanging
process.
4) on both sides of the electric contact pressure gauge control
conveyor under the pressure of oil cylinder pressure, ensure the
smooth delivery of strip steel.
5) the use of external control or internal control roll forming.
6) the weld gap control device to ensure that meet the requirements
of welding seam clearance, pipe diameter, the wrong side of the
amount and weld gap are tightly controlled.
7) welding and welding are used within the United States Lincoln
welding machine for single or double wire submerged arc welding, to
obtain the stable welding specification.
8) after welding the weld passes the online continu