Recently, the last 500-meter-long steel rail weighing more than 30 tons was successfully rolled off the assembly line. The welding of the long rails from the Yuxi to Mohan section of the China-Laos Railway has been completed. Transport and supply will be timely based on the on-site track laying needs to ensure that the track laying is completed on schedule. , Lay a solid foundation for the opening and operation of the whole line.

High precision craftsmanship

The Yuxi to Mohan section of the China-Laos Railway is 508 kilometers long and requires 500 meters of long steel rails totaling 1,780 kilometers. All of them are welded at the Huanglongshan Rail Welding Base of the China Railway Kunming Bureau Group in the eastern suburbs of Kunming. Transported to the site one after another to ensure the smooth progress of the track laying construction.

Zhou Lanping, an engineer at the Huanglongshan Rail Welding Base of the China Railway Kunming Bureau Group, said: “We optimize the welding process according to the characteristics of the long rails and'serve dishes' on demand, effectively reducing the deformation of the rails under the influence of different geological environments and humid and hot climates, ensuring that each rail The quality of the long rails is up to standard, safe and reliable." The long rails of the China-Laos Railway are welded from 60N profile rails with a length of 100 meters. After opening, the safety, stability and comfort of the EMU will be higher.

The domestic section of the China-Laos Railway crosses Mopan Mountain, Ailao Mountain, and Wuliang Mountain from north to south, and crosses Yuanjiang, Amo, Babian, and Lancang Rivers. The geological structure along the route is complex, with abundant rainfall throughout the year, dense long tunnels, and different climatic conditions. The large and complex natural environment puts forward higher requirements on the welding quality of the rails and the technical status of the rails.

The rail welding base of China Railway Kunming Bureau Group actively optimizes the production process, increases the frequency of inspections, and ensures that 28 process technical standards such as arc welding, heat treatment and fine grinding are implemented in place, so that all the parameters of the rail welding head meet the design requirements. Editor/Tian Zengpeng