1.1 Advanced Welding Technology The development of automatic welding technology of pipes began in 1958, when Price Company in the United States developed the first set of automated welding equipment. In 1969, Kraus Company introduced the CRC welding machine. In 1972, the former Soviet Union developed flash welding...

Abstract: Oil and natural gas are fundamental to ensuring national energy security. Pipeline construction, safe operation, and efficient utilization are at the core of developing oil and gas storage and transportation systems. Welding technology plays a crucial role in ensuring the safety, engineering quality,...

Abstract This study analyzes the causes of surface defects in high-frequency welded pipe billets, specifically, linear indentations and molten metal pits caused by the upper extrusion rollers. To address these issues, the design parameters of the upper extrusion rollers were optimized. By increasing the hole radius of...

Abstract: Plastic pipes are widely used in municipal engineering due to their numerous advantages, including high flexibility, excellent hydraulic performance, ease of installation, and strong corrosion resistance. Their application significantly enhances the quality and safety of municipal projects. Currently, various...

Martensitic stainless steel is widely used in demanding environments, such as oil well pipelines, due to its superior mechanical properties and corrosion resistance. However, its corrosion resistance is influenced by several key factors, including alloy composition, microstructure, and external environmental conditions....

2. Corrosion Mechanism 2.1 CO₂ Corrosion Mechanism 2.1.1 Cathodic Reaction CO₂ dissolves in water to form carbonic acid (H₂CO₃), which dissociates in two steps to produce H⁺, HCO₃⁻, and CO₃²⁻ ions. The corrosion mechanism of CO₂ as a weak acid continues to be an area of active research. In CO₂-containing solutions,...

4. Solid Lubricating Coating Traditional lubricants form a fluid or mixed lubrication film at the friction interface, whereas solid lubricants rely on the material’s low shear properties or transfer film to enhance wear resistance and reduce friction. Solid lubricants are typically applied as powders or coatings...

Abstract Threaded connections are critical components in oil well pipes, used to connect oil casings, drilling tools, and other equipment for the transmission of mechanical power. Threaded connection failure is the most common mode of failure in oil well pipes, and the thread surface condition is crucial for the safety...

High-temperature oxidation and corrosion of the inner wall are among the main factors causing the failure of supercritical power station boiler tubes. To extend the service life of boiler tubes and meet rising steam temperature requirements, current measures include using materials with enhanced corrosion resistance, improving...

Anshan Iron and Steel Seamless Plant has successfully trial-produced seamless oil pipes with enhanced mechanical properties and corrosion resistance by optimizing the design composition, smelting, rolling, and heat treatment processes in compliance with American Petroleum Institute (API) Spec 5CT standards. Inspection...

Abstract: A company's Q245R steel boiler tube experienced a horizontal tube burst  after only 8 months of use. The cause of the boiler tube burst was analyzed using macroscopic observation, chemical composition analysis, hardness testing, metallographic inspection, scanning electron microscopy, X-ray diffraction,...

3.1 High-Frequency Straight Seam Welded Pipe (HFW) The development of high-frequency straight seam welded pipe has evolved from traditional roller forming to row roller forming, and now to the current application of flexible forming (FFX), straight edge forming, and equal rigidity (URD) racks. The forming technology has...