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Two-Step Production Process (System HOESCH) Two-Step Production Process (System HOESCH)
   
Spiral Pipe Forming and Tack-Welding Machines - Two-Step Production Process (System HOESCH)
Spiral Pipe Forming and Tack-Welding Machine

Pipe forming - three-roll bending

Pipe forming with outside guide cage

Decoiling and auxiliary drive

   In the economically efficient two-step production process, the spiral pipes are, in the first process step, formed into a pipe body and provisionally welded at a high speed in the spiral pipe forming and tack-welding machine (CO2-weld).
The second process step is described under Submerged-Arc Final Welding Stands.

The following machine types are available at
W + K IndustrieTechnik:

Spiral Pipe Forming and Tack-Welding Machines
Type R-HSP 1800 1)
Type R-HSP 2000
Type R-HSP 2700

Technical Data2):
Pipe Dimensions:
Line Pipes: OD 20" - OD 60"
Water Pipes: OD 26" - OD 100"
Pipe Wall Thicknesses: 6,0 mm - 25,4 mm
Pipe Lengths: 8,0 m - 18,0 m
Pipe Qualities: API 5L, ANSI / AWWA C 200, DIN EN, customer specification
Input Materials: Hot Wide Strip (Coils)
Material Grade max. X70,
Plate
Material Grade max. X80
Production Process:
By using coils: discontinuously, continuously
By using plates: continuously

 

1) R-HSP 1800 means: Spiral Pipe Welding Machine with a strip /plate run-in width of 1,800 mm
2) Differing dimensions on request
 
The Two Stage Manufacturing Process

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Plasma pipe cutting

 

 

Characteristics of the new Spiral Pipe Forming and Tack-Welding Machines (System HOESCH)
Strip-centre guidance and automatic control system
Automatic alignment of the new coil
Use of a strip accumulator for continuous operation
New concept in the area of decoiling, auxiliary drive
 and strip straightening unit
Installation of milling equipment
Pipe forming section, consisting of a three-roll bending
 system and an outside guide cage, motorised rapid-adjustment system for the roller beams when the diameter is changed - the inside arm of the three-roll bending system is infinitely adjustable.
The automatic welding-gap control system achieves an
 accuracy of +/- 0.1 mm
The continuous CO2-tack-welding process (technology
 seam) permits feed speeds of up to 12 m / min.
The welding parameters are automatically adapted
 to the feed speed of the main drive

Plant Layout of a Spiral Pipe Mill
Two-Step Production Process
Besides the Spiral Pipe Forming and Tack-Welding Machine altogether three Submerged-Arc Final Welding Stands as well as the Pipe Finishing Line are shown on the layout. This Spiral Pipe Mill achieves a yearly capacity of 150,000 tons in three-shift operation. The tack-welding speed of the pipes is up to 7.5 m / min. depending on pipe size.

Key
1Coil preparation stand 12Cross-seam re-welding stand
2High-capacity Spiral-pipe forming
and tack-welding machine		 13Welding-tab removal station
3Welding-tab attachement station 14Hydrotester
4Pipe inside cleaning station 15Single-pipe ultrasonic testing stand
5Visual inspection stand 16Manual ultrasonic testing stand
6Submerged-arc final-welding stands 17X-ray photo and image intensifier stand
7Visual inspection stand 18Pipe-end bevelling machine
8Pipe inside cleaning station 19Works inspection stand
9Visual inspection stand 20Repair stand
10.1Welding repair stand 21Customer acceptance
10.2Welding repair stand 22Pipe weighing / marking station
11Pipe cutting ring (burner) 23Pipe transport system
 
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W+K IndustrieTechnik - Kieferstrasse 31 - 44225 Dortmund/Germany - Phone: +49-231-792211-0 - Fax: +49-231-792211-9