Bending Division

We manufacture reliable products.

High Frequency Bending

KJ ENG pursues differentiated technology and customer satisfaction in the field of high frequency bending.

High-frequency bending is a hot working technology that bends various types of beams, such as pipes, H-beams, channels, and I-beams, using high-frequency induction heating. KJ ENG's advanced technology is being in various fields such as gas and petrochemical plants, thermal power and nuclear power plants, ship piping, structures, and civil materials. In particular, it can not only guarantee quality reliability in various fields such as pipelines of power plants that require high quality or inboard piping of ships where cost and delivery are top priority. It replaces the elbow and drastically reduces the number of welding man-hours, providing economic effects, shortening the construction period and improving quality.

Purpose of High Frequency Bending
When power is supplied from the high-frequency generator to the heating coil surrounding the pipe, the narrow circumference around the pipe is inductively heated. When the appropriate bending temperature is reached, the pipe is mechanically driven through the heating coil, cooled by water or air depending on the type of material, and the pipe bends while passing through the heated area. By introducing a low-frequency generator, our company is optimized for bending of heavy wall pipes ranging from 30t to 120t, and it is possible to achieve work efficiency dramatically while maintaining the integrity of the material, and also enables efficient work by significantly reducing power consumption.
Influence of Dimensions on High Frequency Bending
The thickness of the Extrados of the bending area becomes thinner, and the thickness of the intrados part becomes thicker accordingly. Changes in thickness due to bending can be estimated as shown in the table below. The actual value may differ from the depending on conditions such as speed, temperature, cooling method, coil design and material type.
High frequency bending and heat treatment
Depending on the properties of the material after high-frequency bending, the parameters required to achieve yield strength and tensile strength may exceed the limits of surface hardness. The only way to solve these issues may be to apply a post-bending heat treatment. We are equipped with a large-capacity heat treatment that can perfectly perform normalization, tempering, and annealing, and provide total bending services.