Production process of large-diameter straight seam submerged arc welded steel pipe
Dec 18,2025
JCOE forming technology: Steel plates undergo J forming, C forming, and O forming steps in sequence to form open circular tubes, which are then manufactured through processes such as pre welding, internal and external final welding, and diameter expansion. This process is suitable for producing high-grade thick walled pipes with flexible specifications.
Roll forming submerged arc welding technology: When the diameter is large, two steel plates may be rolled to form a double weld structure. This process requires strict control of the welding seam docking accuracy to ensure welding quality.
Automated welding and testing: Both internal and external welding use longitudinal multi wire submerged arc welding (up to four wires), and the welds are 100% inspected by ultrasonic automatic flaw detectors. Some products also undergo X-ray re inspection to ensure non-destructive testing coverage.
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