With the advancement and vigorous development of advanced technology, laser cutting pipe processing technology has made a great leap development in the past ten years of this century, which directly promotes the production efficiency of welded pipes and the quality of welded pipes themselves. Much progress has been made.
Laser cutting manufacturers believe that although the technical quality of welded pipes has been significantly improved, in a highly competitive market, the quality of welded pipes is more demanding. Therefore, on the basis of the prior art, the quality of steel pipe materials is improved. The production cost of steel pipe materials is currently a research hotspot in the welded pipe industry. Employees are required to conduct regular non-destructive inspections of equipment in operation during their daily use. Work requires scientific and systematic elimination of problems arising during the inspection process on the premise of ensuring the personal safety of employees.
1. High-frequency longitudinal welded pipe technology
The conversion and development of high-frequency longitudinal welded pipes is rapid, from the improvement of roll forming to continuous rolling forming, and then forming today’s flexible, straight edge and other rigid frame mixing, forming has become an advanced scientific and technical model, and now it is used More and more perfect. It can be said that intelligent molding has been initially realized to a certain extent. In the process of welding and heat treatment power technology, welded pipe technology has become all current solid type pipe types from the beginning, greatly increasing the power of fuel combustion on the basis of the original, introducing digital business concepts and intelligent automatic control.
Researchers are committed to the study of problems in high-frequency welding processes, put forward practical solutions, improve and correct existing problems, and develop welding processes and quality control methods centered on strengthening the welding zone, which greatly reduces laser cutting china Possibility of defects. The gray point 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, and the performance and quality of the products are improved. The technology uses subsea pipelines and steel. It is widely used in key parts such as oil well pipelines.
2. Welding process of titanium alloy and steel pipe
The welding process of titanium alloy and steel mainly depends on the difference between the two materials and their compatibility in metallurgical theory. The main technical problems of welding titanium alloy and steel pipe are: First, the welding of titanium alloy and steel pipe will be very difficult. At the same time, it is difficult to eliminate large internal stresses. The main influencing factor is that due to the different degree of deformation during the welding cooling process, there is a significant difference between the linear expansion process of the titanium alloy and the steel pipe.
The mutual solubility of titanium and steel is low, which is usually formed during welding. A hard and brittle intermetallic compound, usually titanium ferrite. The formation principle of the material is mainly the diffusion of titanium and iron during the welding process. The supersaturation of iron in titanium will continue for a period of time to form titanium ferrite. Therefore, titanium and carbon form carbon in the steel pipe, and then titanium. At the same time, titanium will form a small amount of chromium, nickel, iron and other intermetallic compounds in the steel pipe, thereby increasing the brittleness of the steel pipe.
3. Welding reinforcement of steel pipe corrosion pits
In the process of transporting oil, natural gas and other materials, due to factors such as the corrosive medium, the pH value of soil and water in the entire area, the pipe wall of the pipeline steel pipe usually becomes thinner, resulting in a decrease in the strength and thickness of the pipeline. Below the allowable range. In addition, mechanical damage and man-made damage to the soil layer caused by displacement will also cause local damage to the pipeline, resulting in poor pipeline operation and huge losses. Therefore, casing repair welding and pressure drilling installation are usually used for online welding repair operations.
In addition, direct surfacing and scar welding are also commonly used methods for pipeline repair and reinforcement.