Heat treatment process, laser hardening has the following characteristics

The heating speed is extremely fast, the cooling speed is high, and the deformation of the workpiece is extremely small. Because the laser has a very high power density, the laser beam can make the surface temperature rise at a rate of 104~1060C/s when scanning the surface of the material. The material can be heated to the phase change zone in a very short time, and the cooling rate of the material can reach 105 9C/s. The action time of the laser is also very short, so the modified area is limited to the surface of the workpiece, and it is not easy to cause thermal deformation of the whole workpiece.

Special power construction means that every link from feasibility study, design to construction will be closely centered on the construction and development needs of the port area, which means more meticulous and more intimate construction and service. At the beginning of 2013, after nearly 5 years of efforts, the 110 kV Qixing power transmission and transformation project entered the construction stage. Faced with such a rapidly developing island, protecting the environment and saving resources have become the work that Ningbo Electric Power Bureau has tried every means to do.

"Considering the long-term development environment of Meishan Island Port, the overhead lines in this area are undergoing "upward to downward" transformation." The person in charge of project design introduced. From the perspective of the long-term development of the port area, conventional overhead lines will inevitably affect the landscape of the Meishan Bridge portal and the future development and construction of the area through which the lines pass.

For this reason, the Ningbo Electric Power Bureau has made forward-looking plans. On the one hand, it has transformed the overhead lines in the development area into underground; on the other hand, it has adopted 110 kV cables with a cross-section of 1000 square millimeters for difficult cross-sea laying, and improved the "regional quality" of Meishan Island with technical quality.

"In order to cooperate with the development of the island and combine the load characteristics of the port area, we have selected the voltage level of the port area distribution network as 20 kV." The person in charge of the project design said that the Qixing power transmission and transformation substation project on Meishan Island is currently under construction.