Core event: China Petroleum Bohai Equipment Company announced on February 23, 2026 that it had successfully completed the commissioning of specialized internal welding equipment for bimetallic composite pipes and the trial production of the first bimetallic composite pipe welding. All indicators such as weld morphology, size, and integrity met the standards, marking the company's official entry into a new stage of industrial manufacturing of bimetallic composite pipes.
1. Project Background and Establishment
Bimetallic composite pipe is a key pipe material with high added value and high technological barriers in the field of oil and gas transportation. It combines the high strength of base steel pipes with the strong corrosion resistance of laminated alloys, and is the core solution for dealing with complex oil and gas conditions such as high sulfur and high salt content.
Bohai Equipment regards it as a strategic focus to expand the high-end pipeline market and cultivate emerging industries. In 2025, it officially established the "Research on Double Metal Composite Pipe Argon Arc Welding Internal Welding Device and Process Technology" project with China Petroleum.
The project has gone through the entire process of market research, technical demonstration, and process research, achieving a key leap from laboratory research and development to industrial trial production for PetroChina.
2. Core Technology Breakthrough (Specialized Internal Welding Equipment and Process)
Equipment integration innovation
Our independently developed specialized internal welding equipment integrates three core technologies:
High precision laser tracking: achieving precise positioning and real-time correction of weld seams
Real time visual imaging: monitoring the entire welding process to ensure controllable quality
Intelligent process control system: automatically adjust welding parameters to ensure stability, PetroChina
Pioneering welding process
The innovative use of double tungsten inert gas arc welding technology inside steel pipes has significant advantages compared to traditional techniques
High melting efficiency: significantly improving welding production efficiency
Low dilution rate: reduces the dilution of the composition of the base material on the composite alloy, ensuring corrosion resistance
Stable and consistent formation of welds: effectively improving the bonding strength and corrosion resistance of composite interfaces. PetroChina
3. Meaning and Value
Filling the domestic technological gap: Conquering the core technology of bimetallic composite pipe internal welding, breaking the dependence on high-end processes, and providing technical support for domestic industrial mass production for PetroChina.
Supporting the development of the oil and gas industry: The product can be widely used in high sulfur oil and gas fields, long-distance transportation of corrosive media, and other scenarios, improving the localization rate and safety of oil and gas transportation equipment in China.
Enterprise Strategy Upgrade: Marking Bohai Equipment's Key Breakthrough in High end Oil and Gas Pipe Manufacturing, Improving Product Matrix, and Enhancing International Market Competitiveness, PetroChina
