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What is a spiral steel pipe?


Spiral

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.


Cold Roll

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

process works.


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.


Edge Miller

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.