Straight Seam Welded Pipe Unit

Product Details


This production line is a specialized equipment for producing straight seam welded pipes in industries such as metallurgy, petroleum, construction, transportation, machinery, and vehicles. It uses hot-rolled steel strips as raw materials, and produces round and square pipes of the required specifications through cold bending and high-frequency welding methods. This production line adopts mature, reliable, complete, and economically applicable advanced processes and equipment to ensure that the physical quality, cost, and various consumption indicators of the products reach a relatively advanced level. The products produced have strong competitiveness in quality and price.

Production line process flow: 

raw materials (strip steel coils) → uncoiling → storage → passive leveling → forming and rolling → high-frequency welding → removal of external burrs → zinc supplementation → spray cooling → sizing and shaping → rough straightening → cutting to length → pipe collection and bundling.

The straight seam submerged arc welded pipe unit(LASW Pipe Unit)is a machine that opens and flattens a certain width of steel plate after longitudinal cutting and slitting, and then enters the forming machine. It adopts fully automatic and accurate control for flexible forming, and uses rollers to bend the steel plate into a circular tube. The steel pipe is pre welded with gas shielded welding, and then cut off. The internal and external welds of the steel pipe are submerged arc welded offline, and qualified submerged arc welded pipes are obtained after water pressure test, flat end chamfering, weld seam and pipe body inspection. The sizing section of the unit adopts fast roll changing technology, greatly saving time for changing specifications.

UOE straight seam submerged arc welded pipe forming process:

The three main forming processes of UOE straight seam submerged arc welded steel pipes include: steel plate pre bending, U forming, and O forming. Each process uses a dedicated forming press to sequentially complete three processes of steel plate edge pre bending, U forming, and O forming, transforming the steel plate into a circular tube.

JCOE straight seam submerged arc welded pipe forming process:

Forming: After several steps of stamping on the JC0 forming machine, first press half of the steel plate into a "J" shape, then press the other half of the steel plate into a "J" shape, forming a "C" shape, and finally press from the middle to form an open "0" shaped tube blank.

Technical Parameters


-- Application Scope --

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Why choose us?

  • Export Experience (Global Trade)

    Since its establishment in 2002, Condor Heavy Industries has successfully operated its equipment in more than 20 countries and has dealers involved.According to Chinese export customs data, Dorco's related equipment ranks among the top ten in the industry, which means reliable quality and price.

  • Customize on demand

    With 21 years of manufacturing and export experience, Dorco supports the design and customization of equipment on demand, provides equipment configuration details and parameter guidance, and guarantees subsequent production quality and equipment adjustment. Here, you can get professional advice for your needs.

Our Clients Say

  • “Excellent plant planning, always the first time to help me solve the problem, thank you!”



    From Pakistan

  • “Excellent technology, fair price, will certainly recommend to friends”

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    Albus Waugh

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  • DORCO has given me the exchange of industry resources, and I hope to have long-term win-win cooperation.



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DORCO Factory Common inquiry

  • What information we need customers to provide?

    Dorco has R&D Center to focus on the study for new product. We can design and make the change as customer’s requirements. We keep an opened mind to service our customers.

  • What’s your quality control system?

    We operate ISO9001 Quality Management System. We control our products quality by our workshop processes: Materials incoming inspection, Machining process control, finished testing and Inspection before packing. Each step has inspector and the testing results will be recorded for checking.

  • What kind of payment terms do you accept?

    We prefer T/T through bank. 30% when order is confirmed and 70% before shipment.

    L/C is also acceptable for amount over 200,000USD.

  • What is your warranty policy?

    All our products are warranted for one full year from date of delivery against defects in materials and workmanship.This warranty does not cover parts that are worn out through the course of normal operation

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