In our country, when polyethylene pipes were first used as gas pressure pipes, most of them used manual/semi-automatic hot-melt connection. Due to the great influence of human factors, there were many unqualified weld joints. There are similar cases in gas companies all over the country. . Later, electrofusion connections were used in some areas, and the situation was improved. In order to reduce engineering costs, promote the development of the polyethylene pipe business, and be safe and economical, foreign countries have been studying hot-melt connection machines that minimize the influence of human factors. In 1990, they began to use automatic hot-melt butt welding machines. At present, the domestic is also vigorously promoting automatic hot-melt welding machines, such as Beijing, Guangzhou, Shanghai and other regions to phase out manual/semi-automatic hot-melt welding machines and replace them with automatic hot-melt butt welding machines.
