The welding pipe mill for producing bundy pipes for air-conditioning refrigerators is a kind of welding pipe mill that turns copper pipes and melts them. This welding pipe mill is complex, with a layer of lead on the surface of copper pipes. The way of rolling copper pipes is wrapping round instead of our conventional rolling round butt joint to form pipes. When the parts are wrapped together, that is, overlapping parts, brazing on copper strips will be welded under the heating of high-frequency coils, thus forming a sealing layer on the overlapping parts, just like coating paper with us. When the paper is rolled up to become a pipe, the overlapping parts will all stick together. The difference is that the curling wrapping method of the welding pipe mill of bundy pipe has the atmosphere of half circle wrapping and full circle wrapping, and the full circle wrapping effect is the best, which is equal to two layers of copper pipes, so the effect is better in daily use, and leakage rarely occurs. This is a good production process of bundy pipe welding line, but the process cost of this equipment is too high, so many air-conditioning pipes we see now are not produced in this way, and there is another production process. In this process, a carbon steel pipe is inside, and then it is tested by pressure and airtightness. After there is no problem, after annealing and pickling, and then copper plating on the surface, a bundy pipe is obtained. The high-frequency welding pipe mill will be used in the welding pipe mill of this Bondi pipe. Compared with the previous bundy pipe mill, it has the characteristics of higher output, easier process and simpler operation, but it also has certain negative effects, that is, pickling will bring certain environmental impact, so it should be done well.