ERW is a general term for resistance welded steel pipes, which are divided into two forms: AC welding and DC welding.
AC welding is divided into low frequency welding, medium frequency, ultra-medium frequency and high frequency according to the frequency. High frequency is mainly used for the production of thin-walled steel pipes or ordinary thick-walled steel pipes, and high frequency welding is divided into contact welding and induction welding.
DC welding is generally used for small-diameter steel pipes.
So high-frequency welded steel pipes are included in ERW welded steel pipes, which are a kind of ERW welded pipes produced by high-frequency welding process.
Both processes
ERW in which pressure is applied through the cathode after the weldment is gathered. This method induces the combination of metals by causing current to flow through the joint contact surface and adjacent areas, generating heat through obstacles. Among them, straight crease welding is a typical application of ERW.
High-frequency welding (HFW) generates heat by utilizing high recurrence current. In this cycle, skin shocks that concentrate high recurrence current on the surface of the workpiece and closed shocks that coordinate the progress of high recurrence current are used. By discharging, HFW quickly heats and softens the edges of nearby steel plates, while taking into account consistent butt joints. HFW is well suited for applications that require rapid creation and high throughput due to its speed and proficiency.
Specific application scenarios
ERW: Due to its high production efficiency, low cost and easy automation, ERW steel pipes are widely used in various industrial sectors such as aviation, aerospace, energy, electronics, automobiles, and light industry.
HFW: HFW steel pipes are suitable for occasions requiring high-quality welding, such as oil and natural gas pipelines, due to their high quality and fast production characteristics.
alloy ERW pipe
