COOEC(SH:600583) Zhong Guo Hua Gong Bao·2025-09-17 11:41Core Insights - The successful completion of the last 10-inch subsea pipeline installation for Qatar's ISND5-2 project marks the first application of China's self-developed Cold Metal Transfer (CMT) fully automatic welding equipment [1] - The subsea pipeline, designed to resist strong acid and sulfur corrosion, spans approximately 13 kilometers, with the CMT equipment operating for over 1200 hours and achieving a welding pass rate exceeding 97% [1] Group 1 - The CMT equipment completed over 1000 welds, totaling approximately 1000 meters of weld seam length, validating the reliability and stability of domestic welding equipment under complex working conditions [1] - Prior to this project, domestic CMT equipment faced limitations in marine engineering due to technical barriers and a lack of experimental data, restricting its application to laboratory and workshop settings [1] Group 2 - The company established a special working group for CMT equipment, collaborating with renowned domestic universities and manufacturers to overcome over 20 key technical challenges [2] - The project developed a self-designed no-liner welding process, effectively addressing issues such as cracking, deformation, and hydrogen-induced cracking, significantly enhancing the corrosion resistance and structural reliability of welds [2]