Inspect steel plate chemical composition, mechanical properties, surface quality and dimensional accuracy.

Cut steel plates into specified size blanks according to production requirements.

Machine plate edges to standard welding groove for full penetration welding.

Pre-bend both plate edges to eliminate straight edge defects after forming.

Press steel plate step by step into tubular blank through JCO forming process.

Fix pipe seam position with spot welding to ensure assembly stability.

Complete inner seam welding by submerged arc welding process with high penetration.

Weld outer pipe seam to form full-wall welded joint.

Preliminarily check welding quality and appearance defects of weld seams.

Calibrate pipe diameter and correct pipe bending and ovality.

Cut welded long pipes to standard fixed dimensions.

Remove sharp burrs and metal residues at pipe ends.

Detect internal defects of weld seam and pipe body comprehensively.

Precisely inspect tiny welding defects for high-standard pipe quality.

Test pipe pressure resistance and weld tightness under rated water pressure.

Machine flat pipe ends and process standard chamfers for installation.

Check overall pipe surface for scratches, pits and welding defects.

Print steel grade, specification, batch number and standard information.

Coat anti-rust oil or protective layer to prevent pipe corrosion.

Bundle qualified pipes and stack neatly in designated area.

Store qualified products and arrange delivery according to orders.