A brief discussion on steel pipe welding processing technology

Although technical quality has improved significantly, in a highly competitive market, the quality requirements for welded pipes are even higher. Therefore, the quality of steel pipe materials has been improved on the existing basis, and the production cost of steel pipe materials has been called a research hotspot in the current welded pipe industry. Staff are required to conduct regular non-destructive inspections of running equipment during daily use. This work requires personnel to comprehensively and thoroughly eliminate problems scientifically and systematically during the inspection process while ensuring the personal safety of the staff.

1. High-frequency straight seam welded pipe technology
The transformation and development of high-frequency straight seam welded pipes has been rapid, from the initial roll forming improvement to the later line roll forming, to today's flexible forming, the combination of straight edge forming and other rigid frames, which has become an advanced science and technology Models are becoming more and more perfect in use today, and it can be said that intelligent molding has been initially realized to a certain extent. As well as the welding and heat treatment power supply technology in the process of welded pipe technology, it has also become the current all-solid-state type from the beginning of the pipe type, which greatly increases the power of fuel combustion on the original basis, and also introduces digital and intelligent automatic control operations. concept.
Researchers are committed to conducting high-frequency welding process research on existing problems, proposing practical solutions, improving and correcting existing problems, and developing welding processes and quality control methods centered on welding zone strengthening, which greatly reduces the occurrence of Possibility of welding defects. The gray spot defect makes the welding performance very close to the base material.
Through a perfect and consistent management model, the quality control of high-frequency welded pipes is extended to the upstream raw material design and production process, improving product performance and quality levels. The technology is subsea pipelines and high-grade steel. Widely used in key parts such as oil well pipes.
2. Welding technology of titanium alloy and steel pipe
The welding process of titanium alloy and steel mainly depends on the differences between the two materials and the compatibility of the two in metallurgical theory. The main technical problems in welding titanium alloy and steel pipe are: First, the welding of titanium alloy and steel pipe will be very difficult. Large internal stresses are difficult to eliminate at the same time. The main influencing factor is the obvious difference in the linear expansion process between titanium alloy and steel pipe, which is caused by the difference in the degree of deformation during the welding cooling process.
The second reason is the low mutual solubility of titanium and steel, which is usually formed during the welding process. A hard and brittle intermetallic compound, usually titanium ferrite. The principle of forming this substance is mainly the diffusion between titanium and iron during the welding process, and the supersaturation of iron in titanium will continue for a certain period of time, thereby generating titanium ferrite. Therefore, the carbon element in the titanium and steel pipe generates carbon, which then generates titanium. At the same time, titanium will also form trace amounts of chromium, nickel, iron and other intermetallic compounds in the steel pipe, thereby increasing brittleness.
3. Welding reinforcement of steel pipe corrosion pits
In the process of transporting oil and natural gas and other materials, pipeline steel pipes often thin the pipe wall due to factors such as corrosive media, soil pH and moisture throughout the area, resulting in reduced pipeline strength and thickness. Below the allowed range. In addition, mechanical damage to the soil layer and artificial damage caused by displacement will also cause local damage to the pipeline, which will lead to poor operation of the pipeline and cause huge losses. Therefore, casing maintenance welding and pressure drilling installations are commonly used in online welding maintenance operations.
In addition, for defects such as pitting corrosion and surface corrosion in corrosion pits, direct surfacing and scar welding processes are also a relatively common method for pipeline repair and reinforcement.
Hebei Huayang Steel Pipe External Processing Project: Bevel painting, pipe cap spray labeling and bundling, cloth-wrapped casing reinforcement, pipe cutting, rust removal, epoxy painting anti-corrosion, straightening, hydraulic pressure, steel pipe welding deep processing, steel support Welding processing, steel pipe pile welding processing, pipe welding prefabrication, plate cutting and blanking, pipe truss assembly and welding, etc.