What Is ERW Pipe – Manufacturing Process Video，Standard，Size

Uncoiling:

Hoist the raw steel coil onto the uncoiler for flattening and straightening

Accumulating：

This step is to achieve uninterrupted production. The uncoiled pipe head and tail are welded together to form an uninterrupted steel strip, and the steel strip edges are trimmed to provide the precise strip width required in the forming and ERW seam welding process

Forming

First, the steel strip is preheated and bent on both sides, and then passes through multiple sets of rollers in sequence to change it from straight to C-shaped to O-shaped, and then bent into a circle and welded.

ERW High-frequency Welding

This is the core of the entire process. The tube billet enters a high-frequency current introduction device, where the high-frequency current is heated at the edge of the tube billet. It is then extruded and bonded together.

Dual Heat Treatment

Heat the weld to a normalizing temperature of approximately 900 degrees to eliminate welding defects, optimize weld performance, and improve pipeline quality.

Air & Water Cooling 

The pipe at normalizing temperature is naturally cooled in air for a certain distance to allow the steel pipe to homogenize the austenite and complete the initial structural transformation. Then water cooling is carried out, and the pipe is sprayed with water in all directions to cool it.

Sizing

After all the above steps are completed, the pipe is processed to achieve the outer diameter, wall thickness and other dimensions that meet the specified tolerance requirements.

End Processing

Process the two sections of the pipe, correct the uneven sections and weld them into the specified groove.

Pipe Machining

Perform Flattening Test, Ultrasonic Inspection, Hydrostatic Testing, Visual and Dimensional Inspection on pipelines to ensure that pipelines meet standard requirements

Varnishing / Coating

We can coat or paint the pipes according to the requirements of customers or standards, making them more beautiful, corrosion-resistant and rust-proof.

Packaging、Container Stuffing

Finally, after being bundled and packed and safely loaded into the container, you can wait for the pipeline to arrive.