Research on single-pass forming width of JCOE longitudinal submerged arc welded pipe

JCOE longitudinal submerged arc welded pipes are widely used in oil and gas transportation, but their JCO forming process suffers from low efficiency due to the lack of precise guidance on single-pass forming width. This study focuses on optimizing this key parameter through theoretical analysis, numerical simulation, and experimental validation. Based on medium plate bending mechanics and considering springback, a theoretical model is established. Under fixed force and lower die opening, analytical expressions for single-pass forming central angle and width are derived. Using ABAQUS, the cold bending process is simulated, and experiments are conducted on a 3600T bending unit. Results show consistent trends between theoretical, simulation, and experimental data, with a maximum error of 11.4% between theory and experiments. Corrected theoretical expressions can guide the determination of process parameters like step length and forming passes in practical production. It provides a theoretical basis and technical support for improving weld pipe quality, enhancing production efficiency, and reducing costs.