With the progress and development of advanced technology, welded pipe technology has achieved leap-forward development in the past ten years of this century, which directly drives the production efficiency of welded pipes and the quality of welded pipes themselves. In the fierce market, the quality requirements for welded pipes are even higher. Therefore, improving the quality of steel pipe materials on the basis of existing research is a hot research topic in the current welded pipe industry. Under the premise of employee safety, this work requires employees to solve problems in a scientific and systematic way during the inspection process.

1. High frequency straight seam welded pipe technology

The rapid transformation and development of high frequency straight seam welded pipes has become an advanced science and technology, and is becoming more and more perfect, from the initial roll forming improvement to the later row roll forming, to flexible forming, straight edge forming and other The combination of rigid frame, it can be said that intelligent forming has been initially realized to a certain extent. In addition to the welding and heat treatment power supply technology in the welding process, it has also become the current all-solid type from the beginning of the tube shape, which has greatly increased on the original basis. the combustion power of the fuel.

The researchers are devoted to the research of high-frequency welding technology in view of the existing problems, put forward practical solutions, improve and correct the existing problems, and develop welding technology and quality control methods focusing on strengthening the welding area, which greatly reduces the insufficient welding. The possibility of making the welding performance very close to the base material improves the product performance and quality level, and is widely used in key parts such as oil well pipes.

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 the compatibility of metallurgical theory. The main technical problems of welding titanium alloy and steel pipe are: the welding of titanium alloy and steel pipe is very difficult, and the main influencing factor is titanium The linear expansion process is significantly different between the alloy and the steel pipe, which is caused by the different degree of deformation when the weld cools.

Secondly, the mutual solubility between titanium alloy and steel is low, which is formed during the welding process, and the hard and brittle intermetallic compound, usually titanium ferrite, is mainly formed by the diffusion of titanium and iron during welding, and The supersaturation of iron in titanium will continue for a certain time, resulting in titanium ferrite.

3. Welding reinforcement of steel pipe corrosion pits

In the process of conveying oil, natural gas and other materials, due to factors such as corrosive medium, soil pH and moisture in the entire area, the wall of the pipeline usually becomes thinner, thereby reducing the strength and thickness of the pipeline, which is lower than the allowable range. In addition, the displacement caused by The mechanical damage and man-made damage will also cause local damage to the soil layer, which will lead to poor pipeline operation and cause huge losses. Therefore, casing maintenance welding and pressure drilling installation are usually used in online welding maintenance operations.

The above has introduced the related issues about steel pipe welding processing technology. I hope the above content can help you.


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