How does the forever used hf welded tube mill machine use high-frequency current to instantly melt metal and cast a perfect welded pipe?
Publish Time: 2024-12-11
The forever used hf welded tube mill machine is an efficient welding equipment widely used in the continuous production of steel pipes. It uses the skin effect (i.e., the skin effect, which refers to the phenomenon that when the current flows in the conductor, it will be concentrated near the surface of the conductor) and the proximity effect (when two or more current conductors are close, the current distribution in each conductor will be affected by the current in other conductors, so that the current is more concentrated on the surface of the conductor) of high-frequency current to quickly heat the metal material to a molten state in the welding area, thereby achieving the purpose of welding.
Generation and supply of high-frequency power supply: First, it is necessary to generate high-frequency current through the high-frequency generator of the forever used hf welded tube mill machine. This current has a very high frequency (usually above 20kHz), so it can ensure that the current density is concentrated on the surface of the material, thereby achieving local rapid heating.
Design and installation of conductors: In the forever used hf welded tube mill machine, the steel pipe is a welded component and also a conductor. After the steel pipe is formed, it is fed into the welding area through a specific guide device. At this time, the steel pipe itself or the auxiliary conductors around the welding area form a loop of high-frequency current. The position and shape of these conductors are carefully designed to maximize the effects of skin effect and proximity effect.
Application of skin effect: Due to the skin effect of high-frequency current, the current is mainly concentrated on the outer surface of the steel pipe, which produces a very high current density on the outer surface of the steel pipe. The current concentrated on the surface generates a large amount of Joule heat (resistance heat), which is enough to locally heat the edge of the steel pipe to a molten state.
Strengthening of proximity effect: In the forever used hf welded tube mill machine, the two sides of the edge of the steel pipe are usually pressed tightly together. This close contact strengthens the proximity effect, that is, when the two conductors (here are the two edges of the steel pipe) are close to each other, the mutual inductance between them will make the current more concentrated on the part where the two edges are in contact, further increase the temperature of the area, and speed up the heating speed during welding.
Welding and shaping: Once the edge of the steel pipe reaches the melting point, the subsequent roller or pressure device will immediately press the molten metal together to form a continuous welded joint. Then, the weld is quickly cooled by the cooling device to complete the final welding process. In addition, it is sometimes equipped with correction and shaping devices to ensure the dimensional accuracy and shape of the welded pipe.
In summary, the forever used hf welded tube mill machine achieves an efficient, fast and high-quality welding process by cleverly utilizing the physical properties of high-frequency current. This technology is suitable for a variety of metal materials, such as carbon steel, stainless steel, etc., and is particularly suitable for the production of long and straight welded pipes, such as conveying pipes, structural steel pipes, etc.
