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    День рождения:
    5 фев 1992 (Возраст: 31)
    What is a spiral steel pipe?


    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.