Low Production Cost Spiral Weld Pipe Mill High Frequency Erw Pipe Mill Line Steady Operation

Duolek Longitudinal Seam Welded Pipe Mill
A mature industrialized pipe manufacturing system, built on years of technical expertise and process optimization, delivering stable and reliable performance advantages.

High-Frequency Longitudinal Seam Welded Pipe Mill
This mill incorporates internationally advanced forming systems, offering advantages such as stable forming, superior pipe surface quality, easy specification changes, advanced technology, reliable equipment, refined processes, and mature production.

• Material: Uses ultra-wide 1500mm steel strips with low carbon content.

• Forming Process: Multi-roller cold forming technology that continuously squeezes and aligns strip edges, ensuring uninterrupted forming and fastening.

• Fastening Method: Utilizes high-frequency electrical current to rapidly heat the strip edges, enabling self-fusion under external force.

Submerged Arc Longitudinal Seam Welded Pipe Mill
Specialized equipment for producing longitudinal welded pipes in metallurgy, petroleum, construction, and other industries. It employs proven advanced processes and equipment to ensure product quality, cost efficiency, and consumption metrics meet leading standards, ensuring strong competitiveness in both quality and pricing.

• Material: Uses narrower 1250mm steel coils, medium plates, and thick plates.

• Forming Process: JCOE cold stamping formation, gradually shaping plates in 50mm increments.

• Fastening Method: Filler material fastening via electrothermal impact between welding wire and plate edges.

Fully Automatic Pipe Hydrostatic Tester
A primary inspection device for welded pipe production, featuring PLC-controlled automated workflows (feeding, clamping, water filling, pressure boosting, pressure holding, pressure release, discharging) and automatic test parameter recording.

• Pipe Diameter: Φ20–Φ3500mm

• Test Pressure: 10–110MPa

• Sealing Types: Radial sealing or end-face sealing.

Fully Automatic Pipe Facing and Chamfering Machine
An auxiliary machine for processing pipe end bevels and flattening ends for field welding compatibility.

• Pipe Diameter: Φ20mm–Φ3500mm

• Φ60mm–Φ339.7mm Range: Step-feeding high-speed facing and chamfering machine, ideal for petroleum casing and ERW pipe manufacturers.

Ultrasonic Flaw Detector

• Automatically alarms and marks defects for parameter adjustments.

• Weld sections with continuous UT marks undergo manual ultrasonic and X-ray re-inspection.

• Repaired defects undergo repeated NDT until fully eliminated.

X-Ray Inspection
Duolek Heavy Industry’s X-ray equipment detects hidden weld spots in welded pipes and intelligently analyzes results, supporting the goals of "first-pass qualification" and "zero defects."

Applications
This production line serves as specialized equipment for manufacturing longitudinal welded pipes in metallurgy, petroleum, construction, transportation, machinery, vehicle, and related industries.

▶ Size range divided by purpose

▶ Straight Seam Welded Pipe Unit Application Scope:

▶ 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, Duolek'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, Duolek 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.

▶ Customer factory inspection communication:

▶ Our Clients Say

▶ Duolek Factory Common inquiry

Q:What information we need customers to provide?

A:Duolek 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.

Q:What’s your quality control system?

A: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.

Q:What kind of payment terms do you accept?

A: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.

Q:What is your warranty policy?

A: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

Shandong Duolek Heavy Machinery Co., LTD., located in Puji Industrial Park, Jiaozhou, Qingdao, Shandong Province. We are a large-scale heavy industry machinery manufacturing enterprise in China. The company is mainly engaged in the design, manufacturing, and installation of large-scale equipment such as heavy industry machinery, ring rolling machines, steel spiral welded pipe machines, mining machinery, etc. Its products cover multiple series such as self unloading, construction, sanitation, logistics, mining machinery, as well as key assembly components.

The company adheres to high-quality development, and after years of development and accumulation, through independent innovation and introduction of technology digestion, absorption, and re innovation, it has a deep technological foundation and strong development and manufacturing capabilities. The production workshop covers an area of over 20000 square meters. With advanced production lines, strong design, research and production capabilities, stable and high-quality products, and a comprehensive after-sales service system, Duolek Heavy Machinery Co., LTD. has won the market and gained recognition and praise from customers.

Taking technology as the guide and winning the market with quality is the unremitting pursuit of Duolek Heavy Industry.