Selection of Heating Frequency of Duct Heating Furnace

The heating frequency of the pipeline heating furnace has a great relationship with the diameter of the pipeline, and the depth of heat penetration should be guaranteed. Since the process requires that the temperature difference between the inner and outer walls of the pipeline is less than or equal to 10 degrees Celsius, when the frequency is 1000Hz, the current penetration depth of the pipeline workpiece is only 1.2mm. To properly increase the current penetration depth and ensure the temperature difference between the inner and outer walls, it is necessary to reduce the intermediate frequency. The frequency is determined to be 800 to 1000 Hz.