Let's first talk about the definition and principle of high-frequency welded pipes: high-frequency welded pipes are pipes that generate resistance heat through high-frequency current and apply or do not apply pressure. The frequency of high-frequency current is between 10~500KHz, and the edge of the pipe billet is heated and melted by using the high-frequency induction heating effect, and then pressure welding is carried out under the action of the extrusion roller. There is a difference between high-frequency welded pipe and ordinary welded pipe, which mainly reflects the following aspects.

   1. Different welding methods

Ordinary welded pipes generally use traditional welding methods such as manual arc welding and gas shielded welding, while high-frequency welded pipes use the skin effect and proximity effect of high-frequency current to quickly heat the edge of the pipe billet to the welding temperature, and then realize welding under the action of extrusion rollers.

2. The quality of the weld is different

The welds of ordinary welded pipes are usually rough, prone to porosity, slag inclusions and other defects, while the welds of high-frequency welded pipes are relatively smooth, uniform, and of relatively good quality. Due to the fast welding speed and small heat-affected zone, the strength and toughness of the weld are high, which can meet higher usage requirements.

3. Different uses

Ordinary welded pipes are generally used in some occasions with low quality requirements, such as building scaffolding, low-pressure fluid transportation, etc., while high-frequency welded pipes are widely used in oil, gas, chemical, electric power and other fields, as well as some mechanical structural parts with high quality requirements.

4. The cost is different

From the production point of view, high-frequency welded pipes do not produce exhaust gas and wastewater, low noise, no pollution, environmental protection and reduce procurement costs.