The production process and inspection level of thin-walled alloy steel pipes are constantly improving. With the introduction of new processes, both in terms of production efficiency and product quality, there has been significant improvement and development. It can be said that the development of thin-walled alloy steel pipes , Is also a testimony to the success of the industry. Especially in the fields of construction and machinery manufacturing, the role played by thin-walled alloy steel pipes is also not to be underestimated. In addition, in the field of pipeline transportation, thin-walled alloy steel pipes also have significant advantages, which can greatly improve transportation safety. .

The hollow fiber with binder is embedded in the concrete. When the building is under external pressure, the internal stress of the material changes and cracks are generated. The binder flows from the hollow fiber to the matrix and solidifies to repair the instantaneous cracks of the thin-walled alloy steel pipe. This technology is widely used in roads, foundations, bridge piers and other buildings.

For the pores formed in the copper during high temperature fatigue and creep, the study found that the sintering phenomenon of the pores can be observed when annealing under the hydrostatic pressure of 13.8 Pa, and then when annealing under vacuum, the thin-walled alloy steel pipe appears opposite to the sintering of the pores. The phenomenon. It is observed that the pores gradually decrease after annealing, but the pores on the thin-walled alloy steel pipe still exist. After the crack is located by CT or X-ray, a small hole is drilled against the crack, and the brazing agent is filled and brazed to realize the repair of the internal micro cracks.

High-current pulses can be used as a way of instantaneous energy input. The components containing cracks are passed with high-current pulses. When the direction of the current is perpendicular to the cracks, adjusting the magnitude of the current can achieve crack repair without melting. And can adjust the internal microstructure of the material. Realize the improvement of material fatigue performance.