【BRIEF INTRODUCTION】High frequency welding mainly utilizes the skin effect and the proximity effect of high-frequency current to make the current height setting located at the edge to be welded, allowing it to be heated to the second percentile of the welding

High frequency welding mainly utilizes the skin effect and the proximity effect of high-frequency current to make the current height setting located at the edge to be welded, allowing it to be heated to the second percentile of the welding temperature (1130-1350’C), and then pressure welding is carried out under the action of the extrusion roller.

This welding method has a series of advantages: small welding heat affected zone, fast heating speed, greatly improved welding speed and quality, and the strip can be used as a blank without the need for pickling, blasting, and trimming. Welding alloy steel, high alloy steel, and non-ferrous metal pipes greatly reduces unit power consumption. Various metal welded pipes can be produced using a single welding equipment. For different metals, only corresponding changes in welding power and welding speed are required.

The high-frequency welding method can be divided into conductive (contact welding) and induction feeding (induction welding) based on the different feeding methods of the workpiece to be welded. In the case of conductive feed welding, high-frequency current is transmitted to the tube blank through two contact points (electrodes) 2 and 3. The welding current flows along both sides of the inclined plane of the tube blank, and the ring is formed by the convergence points on both sides of the groove near the pressure roller 5. The current direction on the inclined planes on both sides of the tube blank is opposite. The high-frequency welded pipe supplier indicates that proximity effects cause the current group to be located on the surface of the groove. The higher the current frequency, the more current is collected on its surface. Resistor 4 increases the mid range of the groove heating group because it increases the inductance of the current flowing around the tube blank.

Using this welding method, the contact can be placed at different distances from the convergence point (30-200mm). The high-frequency welded pipe supplier indicates that when the pipe blank moves, the contact can slide along the top or bottom of the edge to be welded. The solution of placing the contact head on the edge to be welded is the most widely used solution, as the structure of the welding device can be simple and reliable.