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- День рождения:
- 5 фев 1992 (Возраст: 31)
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What is a spiral steel pipe?
- День рождения:
- 5 фев 1992 (Возраст: 31)
Welded Pipe Line is made by steel coil, extrusion forming
under the normal temperature, then taken the technology of
double wire and double-faced submerged-arc welded. Spiral steel
pipe, also known as spiral or helix spiral steel pipe, is a
low-carbon steel or low-alloy structural steel strip at a
certain helix angle (called molding angle) rolled into a tube,
and the tube is made of welded joints It can be produced with a
narrow strip of large diameter pipe.
During molding process of spiral welded steel pipe, steel
plate has uniform deformation and light residual stress, thus
the surface has no scratches. Spiral steel pipe has more
flexible thicknesses and diameters, especially in making high-
grade thick pipes with small or medium aperture, these
techniques has incomparable advantages in satisfying your needs.
Production process of spiral steel pipe
1. unwinding board probe: After entering the unwinding plate
production line, the first full-board ultrasonic testing.
2. Leveling Milling: The flat steel anvil machine so that the
original curl, and then through the edge milling machine for
two-sided steel milling, so as to meet the requirements of the
plate width, plate edge parallelism and groove shape.
3. shear molding: the steel plate production line along the
outer edge of the spiral curl into a tube.
4. butt cut: double-sided submerged arc welding using advanced
technology to pre-welding, internal welding, outside welding.
Ion foot cut to specification length
Spiral Welded Pipe Mill use and so on.
5. visual inspection: by professional and technical personnel to
some of the basic parameters to be checked.
6. The ultrasonic flaw detection: internal and external weld and
weld on both sides of the base material 100% inspection.
7. X-ray detection: internal and external welds 100% X-ray
industrial TV check image processing system to ensure that the
use of detection sensitivity.
The first is to know the difference between ERW and HFW welding
processes. High-Frequency Welded (ERW) Pipe Line
welding process refers to the heat generated by the resistance
of the current flowing through the connecting metal. Therefore,
a large current is required to charge the entire surface of the
steel plate or coil to the welding length. During ERW welding,
the current flowing through the entire conductor is 50/60 Hz.
ERW is the general term for electric resistance welded steel
pipe. It can be divided into two types: alternating current
welding (AC) and direct current welding (DC). According to the
different frequency, AC welding can be divided into low
frequency welding, intermediate frequency welding, ultra high
frequency welding and high frequency welding. High frequency
welding (HFW) is mainly used for ordinary or thin-walled steel
pipes. It includes contact welding and induction welding. DC
welding is usually used for small diameter steel pipes.
Generally, HFW is one of ERW production methods, which uses
high-frequency welding technology. Therefore, ERW steel pipe
includes HFW steel pipe.
Forming Line consists of gradually and continuously
forming a steel profile. The method consists initially unrolling
the strip of a steel coil, whose width corresponds to the
developed of the finished profile. This band, also called strip,
is then engaged flat in a succession of several rolls called
rollers whose shapes and numbers are variable depending on the
complexity of the desired steel profile.
The forming of the profile is performed very gradually, we
do not have to fear the cracks or even the breaks that occur in
the cold bending to the press or stamping. Finally, although it
is not a rolling, the operation produces a certain surface
hardening known as the "skin effect". The
manufacturing, initially limited to hot and cold rolled steel
strip sections, has gradually expanded to include stainless
steel and aluminum and copper alloy profiles.
Steel is an alloy of iron that is mixed with carbon which
improves its strength and durability. Combine these properties
with its low cost and you have a perfectly-suited alloy for a
multitude of uses in various end applications, including (but
not limited to) automotive, infrastructure, and appliance/HVAC.
Enter the role of steel processors. Steel processing
companies like National Material Company provide manufacturers
with the right steel material for their industry. This article
will focus on the topic of steel
Slitting Line and how the slitting
Steel slitting is a steel manufacturing process wherein a
coil of steel is slit into the lengths and widths specified by
the end application. This process requires machinery lines
equipped with a decoiler, slitter, and a recoiler — to achieve
the end product: slit steel coils, or “mults.”
Pipe Endfacing and Beveling Machines are suitable
for pipe applications to meet any internationally known
standards, including those of API and AWWA. End Facing and
Beveling Machines can be used with pipes produced by the
electric resistance welding (ERW) process as well as pipes
produced by the submerged arc welding (SAW) process.
machines can operate on both flat or rolled shapes with ranges
up to 18000mm in length and 3 milling heads. Hydraulically
retractable backstops assist plate alignment and reduce machine
set-up time. Tight straightness tolerances meet automatic
welding requirement for high productivity.