ERW steel pipe production line

ERW (Electric Resistance Welding) steel pipe utilizes induction welding, which requires no weld filler, produces no welding spatter, has a narrow heat-affected zone, and results in aesthetically pleasing welds with excellent mechanical properties. This makes ERW steel pipes highly desirable in various industries. The ERW steel pipe production line is among the most advanced globally, with key equipment supplied by leading manufacturers such as Germany's SMS and MEER. This article details the ERW steel pipe production line.

Overview of ERW Steel Pipe Production Line

ERW steel pipe machines are specialized equipment for producing straight seam welded pipes used in metallurgy, construction, transportation, machinery, vehicles, and other industries. These machines use cold-rolled and hot-rolled steel strips as raw materials, forming round, square, and rectangular tubes of specified dimensions through cold-rolling and high-frequency welding. The forming process employs the "W" forming method, ensuring optimal force distribution and perfect deformation across each unit.

ERW Steel Pipe Machine Process

Uncoiling: The steel coil is uncoiled.

Shear End Welding: The ends of the coil strips are butt-welded in the strip preparation section.

Cage: The strip is fed into the accumulator.

Forming: The strip is pulled from the accumulator and formed into an open tube.

Welding: The open tube is welded along the longitudinal seam using solid-state high-frequency welding.

Cleaning: External burrs are removed.

Cooling: The welded tube is water-cooled.

Sizing: The tube is sized to the required dimensions.

Cutting: The tube is cut to length with a flying saw.

Discharging: The cut tubes are moved to the discharging table.

Tube Collection: The tubes are collected.

Packing: The tubes are packaged.

Raw Material Characteristics

Pure Steel: Ensures stable chemical composition and consistent steel performance.

High Dimensional Accuracy: Coils have high dimensional accuracy, well-controlled plate shape, and excellent surface quality.

Online Detection Technology

Ultrasonic Plate Detection: Detects layered and longitudinal defects with defect tracking and painting devices to ensure 100% detection, tracking, and removal.

On-line Weld Seam Ultrasonic Flaw Detection: Detects longitudinal defects, heat-affected layers, and internal burr height for process control.

On-line Flattening Test: Samples are taken at 0°, 90°, and pressure direction of the weld seam to ensure basic performance requirements.

Hydrostatic Test: Ensures tightness of the base metal and weld seam of each steel pipe.

Off-line Ultrasonic Flaw Detection of Weld Seam: Includes magnetic particle flaw detection of pipe ends and groove surfaces, artificial ultrasonic flaw detection of pipe ends, and finished product size detection.

ERW Pipe Manufacturing Process

Converter Steelmaking

Outside Refining

Continuous Casting

Hot Rolling

Coiling

Strip Flattening

Head Cutting

Butt Welding

Spiral Looper

Edge Washing

Strip Ultrasonic Flaw Detection

Forming

High-Frequency Welding

On-line Weld Seam Ultrasonic Flaw Detection

On-line Weld Seam Heat Treatment

Air Cooling, Water Cooling

Sizing

Flying Saw Segmentation (Flattening Test)

Pipe End Chamfering

Hydraulic Test

Weld Seam Ultrasonic Flaw Detection

Pipe End Flaw Detection

Appearance Dimension Inspection

Length Measurement and Weight

Punching and Labeling

Coating

Packaging

Factory Dispatch

The ERW steel pipe production line's advanced technology and meticulous processes ensure high-quality, reliable pipes suitable for diverse industrial applications.