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Shijiazhuang Faith Machinery Co., Ltd. is a professional manufacturer and supplier of ERW mills (Electric Resistance Welding tube mills) in China. With advanced technology and strict quality control, we provide complete ERW pipe production lines designed for high efficiency, accurate welding, and long-term reliability in steel pipe manufacturing industries worldwide.
1. What is an ERW Mill
2. Working Principle of Electric Resistance Welding
3. ERW Tube Mill Line Components
4. Technical Specifications
5. Advantages of Faith ERW Mill
6. Applications in Different Industries
7. Quality Standards and Testing
8. Maintenance and Operation Guide
9. Frequently Asked Questions (FAQ)
10. About Shijiazhuang Faith Machinery Co., Ltd.
An ERW Mill (Electric Resistance Welding Mill) is a complete production system used to manufacture welded steel pipes and tubes from steel coil strips. The edges of the strip are heated using electrical resistance, and pressure is applied to create a continuous welded joint.
This technology is widely used for producing carbon steel and galvanized steel pipes, which are essential in construction, oil and gas pipelines, automotive tubing, and mechanical structures.
The ERW process involves the following steps:
Uncoiling and Leveling: The steel strip is uncoiled and flattened.
Forming: The strip passes through forming rollers to shape it into a round pipe.
Welding: Electric current heats the strip edges until they reach plastic state, then they are pressed together to form a solid-state weld.
Smoothing and Sizing: The welded tube passes through sizing rollers to achieve precise outer diameter and roundness.
Cutting: The continuous tube is cut to the desired length by a flying saw.
Finishing and Testing: Non-destructive testing (NDT) and hydrostatic tests ensure weld integrity and surface quality.
This process produces high-strength welded pipes with smooth surfaces and tight dimensional tolerance.
A typical ERW mill line manufactured by Faith Machinery includes:
| Component | Function |
|---|---|
| Decoiler | Holds and feeds steel coil into the line |
| Shear & Butt Welder | Joins coil ends for continuous operation |
| Accumulator | Stores strip to maintain production speed |
| Forming Section | Gradually shapes the flat strip into a round form |
| High-Frequency Welding Unit | Performs the actual resistance welding process |
| Sizing Section | Adjusts the final pipe diameter and wall thickness |
| Flying Saw | Automatically cuts pipes to specified lengths |
| Run-out Table | Collects and arranges finished pipes |
| Control System | PLC and touch screen interface for automatic control |
| Parameter | Specification Range |
|---|---|
| Pipe Diameter | 12mm – 508mm |
| Wall Thickness | 0.5mm – 12mm |
| Line Speed | 10 – 120 m/min |
| Welding Method | High-Frequency (Solid-State or Induction) |
| Material | Carbon Steel, Galvanized Steel, Stainless Steel |
| Power Supply | 220V / 380V / 415V (Customized) |
| Control System | PLC with Servo Drive |
| Pipe Length | 3 – 12 meters |
| Production Mode | Continuous Automatic Operation |
✔ High Production Efficiency: Continuous operation reduces downtime.
✔ Precision Welding: Solid-state welding ensures smooth and strong seams.
✔ Energy Saving: Optimized power usage with stable welding control.
✔ Low Maintenance: Modular design simplifies repair and part replacement.
✔ Flexible Customization: Adjustable for different diameters, materials, and pipe thicknesses.
✔ Comprehensive After-Sales Support: Installation, training, and technical service worldwide.
The ERW pipe mill is used to manufacture welded tubes for:
Oil and Gas Pipelines
Construction and Structural Steel
Water Supply Systems
Automotive Tubing
Furniture and Mechanical Frames
Agricultural Irrigation Systems
These sectors rely on ERW steel pipes for their uniform strength, cost efficiency, and long service life.
All ERW mills from Shijiazhuang Faith Machinery meet international standards such as ASTM, API 5L, EN, GB/T, and ISO 9001.
Each mill is subjected to strict testing before shipment, including:
Dimensional Accuracy Test
Weld Strength Verification
Hydraulic Pressure Test
Eddy Current and Ultrasonic NDT Inspection
Performance Run-Off Test
To ensure stable production and long service life:
Regularly clean welding contacts and rollers.
Check electrical connections for tightness.
Monitor temperature and pressure of welding system.
Lubricate forming and sizing rollers weekly.
Replace worn rollers and blades on schedule.
Proper maintenance ensures consistent weld quality and minimizes downtime.
Q1: What materials can be processed on the ERW mill?
Carbon steel, stainless steel, and galvanized steel coils.
Q2: What is the maximum pipe diameter Faith Machinery’s ERW mill can produce?
Up to 508mm depending on model configuration.
Q3: Can the machine be customized for different thicknesses?
Yes, we design mills to suit customer-specific size and material requirements.
Q4: Does Faith Machinery provide installation and training?
Yes, our engineers can travel globally for on-site installation and operator training.
Q5: What after-sales support is available?
We offer remote troubleshooting, spare parts supply, and long-term technical support.
Shijiazhuang Faith Machinery Co., Ltd. specializes in the design and manufacture of ERW tube mills, pipe making machines, and auxiliary equipment for the global steel pipe industry. With years of engineering experience and continuous innovation, we deliver reliable solutions that meet production efficiency and international quality standards.
Company Information:
Company Name: Shijiazhuang Faith Machinery Co., Ltd.
Tel: +86 15350593960
E-mail: crystal@faith-machinery.com
Website: www.faith-machinery.com
Address: No. 87, Cangyu Road, Yuhua District, Shijiazhuang City, Hebei Province, China
| Feature / Parameter | ERW Mill (Electric Resistance Welding) | SSAW Mill (Spiral Submerged Arc Welding) | Seamless Pipe Mill |
|---|---|---|---|
| Raw Material | Steel Coil / Strip | Steel Coil (Spirally Rolled) | Solid Round Billet |
| Welding Method | Electric Resistance (High-Frequency or Induction) | Submerged Arc Welding | No Welding (Piercing and Rolling) |
| Pipe Diameter Range | 12mm – 508mm | 219mm – 2500mm | 10mm – 720mm |
| Wall Thickness Range | 0.5mm – 12mm | 4mm – 25mm | 2mm – 50mm |
| Production Speed | 10 – 120 m/min (High) | 1 – 10 m/min (Medium) | 0.5 – 5 m/min (Low) |
| Pipe Length | 3m – 12m | Up to 18m | 3m – 12m |
| Weld Seam | Longitudinal Straight Seam | Spiral Seam | None |
| Surface Finish | Smooth and Uniform | Moderate | Very Smooth |
| Strength | High (Suitable for medium pressure) | High (Suitable for high pressure) | Very High (No weld joint) |
| Cost Efficiency | Very Economical | Moderate | Expensive |
| Production Flexibility | High (quick coil changeover) | Moderate | Low (requires billet heating and rolling) |
| Applications | Construction, Water, Gas, Furniture, Automotive | Oil, Gas, Structural Piping, Offshore | Boiler Tubes, Hydraulic Pipes, Oil Industry |
| Quality Control | NDT, Eddy Current, Hydrostatic Testing | Ultrasonic, X-Ray, Hydrostatic Testing | Ultrasonic, Hydrostatic, Dimensional Testing |
| Maintenance Level | Low | Medium | High |
| Output Volume | High | Medium | Low |
| Energy Consumption | Low | Medium | High |
| Recommended By | Shijiazhuang Faith Machinery Co., Ltd. | Heavy-duty pipeline manufacturers | Seamless tube producers |
The ERW mill offers the best combination of speed, precision, and economy for medium-diameter pipes.
SSAW mills are ideal for large-diameter pipelines used in long-distance oil and gas transportation.
Seamless mills produce the strongest pipes with no weld seam, suitable for high-pressure and high-temperature applications but at higher cost.
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