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  • Cangzhou Steel Pipe Group (CSPG) Co., Ltd.
  • ADD:No.92 Jiefang East Rd., Cangzhou City, Hebei Province, China
  • TEL:+86-31-75673271
  • MOBILE:+8615373302068
  • E-MAIL:ella@cnspipe.com
  • Internal External Spiral Welding Pipe

    Spiral welding ESAB offers welding equipment for Offline spiral pipe mills: ♦Strip joining (coil to coil welding) ♦Tack welding (MAG) ♦Internal SAW welding ♦External SAW welding Online spiral pipe mills: ♦Internal SAW welding ♦External SAW welding Offline Spiral Welding of pipes In an off-line...
    Product Details:

    ProductName

    Construction of large-caliber rogue conveying site construction internal and external anti-corrosion spiral steel pipe

    Size

    O.D:

    50-1650mm

    Thickness:

    2-60mm

    Length:

    6m/9m/12morothersizeaccordingtothecontract

    SteelMaterial

    ASTM/ASMEA53,A106,A333,A335/API5CT/DIN1629,2448/Q235,Q345

    Standard

    GB/BS/DIN/ASTM/ASME/JIS/GOST,etc

    Application

    UsedForconveyingwater,petroleum,gas.

    Ends

    PlainorBeveled(CanbeProtectedByPlasticPipeCap)

    SurfaceTreatment

    BaredOrPaintWithOil,Bitumen,1-3layerPE
    (OutsideOrInsideAnti-CorrosionTreatmentCanSupply)

    Inspection

    WithHydraulicTesting,EddyCurrent,InfraredorX-RayTest
    AlsoWithChemicalAndPhysicalPropertyInspect

    Technique

    high-frequencywelded

    Minorderquality

    10ton

    WeldedLineType

    SSAW/ERW/LSAW/SEAMLESS

    SectionShape

    Round

    Packing

    A)InbulkB)Aspercustomers'requirements

    DateofDelivery

    20-40 Days according to total Quantity

    PortofShipment

    Tianjin,China

    Others:

    PP,2PE/3PE,FBE,IPN8710,HPDE,epoxycoaltarcorrosionresistantpipelines.
    Specialdesignavailableaccordingtorequirement.


    Spiral welding

    ESAB offers welding equipment for

    Offline spiral pipe mills:

    ♦Strip joining (coil to coil welding)

    ♦Tack welding (MAG)

    ♦Internal SAW welding

    ♦External SAW welding


    Online spiral pipe  mills:

    ♦Internal SAW welding

    ♦External SAW welding


    Offline Spiral Welding of pipes

    In an off-line  pipe mill, the forming station which is equipped with tack welding, feeds three separate offline welding stations, each with internal and external SAW welding heads.


    Strip joining

    The strip joining station consists of a beam-running carriage holding a plasma cutting torch, MIG/MAG tack welding torch and a tandem SAW welding head. The  procedure is that after cutting the edges clean, the edges will be joint prepared by milling. The strips are thenbrought together, tack welded and completed by tandem SAW welding.


    Tack welding station

    Tack welding is  done with the MIG/MAG process and with welding speeds up to 8 m/min. The tack welding torch is mounted on a slide (for joint tracking) along the forming arm in the forming station. The purpose of tack welding is just to hold the pipe  together prior to the ID and OD SAW welding.


    Internal  welding station

    The ID Welding station consists of a 16-18 m long boom with a 3-wire welding head at the end. The angle of the welding head is adjustable to match the helix angle of the weld seam of the pipe. The welding head is mounted on a slide with movement in the axial direction for joint tracking.

    Prior to welding the welding boom is inserted by its full length into the pipe. Welding is done while rolling/screwing the pipe out from the ID boom. This is mainly to avoid the ID boom with all its cabeling being affected by the heated pipe.

    image001


    External  welding station

    The OD welding station is built on a semi-stationary column and boom holding a 4-wire welding head. As the space for the welding head on the OD station is not so limited the wire feeders are mounted in a "rainbow" configuratin enabling the wireliners between the contact nozzles and wire feed motors being straight.

    image002

    The whole "rainbow arrangement  with wire feed motors is mounted on a ring enabling the welding head assembly to be rotated into correct helix angle of the spiral pipe.


    Earthing system

    ESAB offers different types of earthing systems for pipe production. Most  common is to have a set of brushes mounted on a rack, one in front and one  behind the external welding head. The internal welding head uses the same type  of brushes.

    image003


    ESAB also offers return current systems  where the brushes are travelling on a carriage next to the pipe.

    image004


    The carriage with brushes first starts  in a position by the internal welding head. When welding, the pipe moves  towards the external welding head and the carriage with return brushes follows  the pipe to the position of the external welding head where it stops. The  advantage of this system is that the contact point for return current doesn't  change from one point to another - it remains the same point but only changes  position.


    Online Welding of pipes

    The online pipe mill welds SAW direct without tacking in the forming station, limiting the production to the welding speed in the forming station. In the forming station a SAW welding head is mounted at the same place as the tack welding head in an off-line station. Normally 2-3 SAW torches are used.

    On the upper end of the forming station a 2-torch welding head is mounted in  the same configuration as the OD welding station for off-line spiral welding.


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