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...

The development history of the continuous rolling process of the steel pipe The production of seamless steel pipes originated from the cross rolling piercing process of the MF Brothers in Germany. When they straightened round steel bars on a slanted roll straightening machine, they found that the center...

A comprehensive comparative analysis of ductile iron pipes and steel pipes with different materials is carried out in this article, and a preliminary analysis of the actual engineering economic comparison results of generally buried pipelines is provided. 1. Making a comprehensive performance...

The main pipes for buried gas pipelines are cast iron pipes, PE pipes, and steel pipes. The nature of each pipe determines the strength, plasticity and corrosion resistance of the pipeline. Therefore, choose suitable pipes based on research on the use environment and characteristics of...

1.5 Metallographic inspection Cut 3 pieces of metallographic samples along the base material of the leaking pipe, the largest opening and crack tip of the leakage port from the cross section. The etchant is the nitric acid alcohol solution with 4%. The metallographic samples are observed by...

Abstract: The leakage at the four tubes such as the water-cooled wall, superheater tubes, reheater tubes, and economizer tubes in a power station boiler is one of the important factors that cause the unplanned shutdown of the unit. In order to deeply analyze the leakage of the butt welding seam of the reheater...