Perforation is the first process and one of the most important deformation processes of hot rolled seamless steel pipes. Its function is to pierce the solid tube blank and a hollow tube is formed. According to the deformation characteristics of the tube blank's piercing process, it is divided into the longitudinal...

1. The chemical composition of steel The chemical composition of steel is the most important factor affecting the performance of seamless steel pipes. It is also the main basis for formulating the process parameters of tube rolling and heat treatment of steel tubes. In the seamless steel pipe standard, corresponding requirements...

1.3.2 Influence of opening angle and extrusion force It is very important to ensure that the edges of the stainless steel strip are flat, smooth and have as few burrs as possible for subsequent welding. Zesheng Zhang and others found that whether the burning process of the edge is stable or not during welding...

At present, a lot of research is carried out on the high-frequency welding of stainless steel. Yudong Dong and others studied and analyzed the changes in the microstructure and properties of the welding seam by high-frequency welding of 12%Cr ferritic stainless steel. Zongyue Bi and others studied...

Abstract: To ensure the quality of stainless steel high-frequency welded pipes and realize their quality control, the main factors affecting the process quality of stainless steel high-frequency welding were analyzed, including the physical and chemical properties of stainless steel, welding and forming processes....

Around 1970, China imported some magnetic flux leakage detection devices from developed countries. After that, China gradually began to conduct research on magnetic flux leakage technologies. In 1999, given China's great demand for magnetic flux leakage detection technology for steel pipes,...

In recent years, developed countries have attached great importance to the development of magnetic flux leakage detection technologies. Although the main body in many types of researches is not the seamless steel pipe, it is also crucial to the development of magnetic flux leakage detection technology for seamless...

Seamless steel pipes have been widely used in the delivery, construction, machinery and other fields, and play a pivotal role in the industry. They are called the vessel of modern industry. The defects of seamless steel pipes are mainly formed by the slow extension of metallurgical defects. In the subsequent...

3. Scanning tests of welding seams (1) Calibration of AUT systems: The adjusted AUT scanning device was plated on the calibration  block to calibrate one by one in accordance with the simulated focus law to ensure that the amplitude of the strip scan signal of each channel was between...

Abstract Automatic Ultrasonic Testing (AUT) has become the preferred testing method for welding seams of carbon steel pipes due to its high efficiency, accuracy and environmental protection. However, AUT is difficult to apply to the inspection of pipelines with a diameter of 114.3 mm (4 inches) and below due...