HF Welder-spare parts of welded steel pipe machine
Description:
HF welder is the short name of High Frequency Welder. It is the key elements of the whole welded pipe machine. It is this part to make the rolled round shape pipe with seam to seamless. High frequency is developed from lower frequency since 1960. And by the high frequecny welding method, machine working speed has been enhanced greatly meanwhile the seam is perfect with sacre.
What is HF Welding process?
This welding method again simultaneously utilizes pressure and heat in order to join the strip edges of the open-seam tube together without the addition of a filler metal. Squeeze and pressure rolls in the welding stand bring the edges of the open-seam tube gradually together and apply the pressure necessary for welding. High-frequency alternating current offers a number of benefits as the energy
source for generating the heat required for the welding process. For example, it has the advantage over normal alternating current of a very high current density (flux) over the cross section of the conductor. Because of its high frequency, HF current has the effect of building up a magnetic field at the centre core of the conductor. The conductor’s ohmic resistance is at its highest in this field, so that the electrons follow the path of least resistance at the outer surface region of the conductor (skin effect). The current thus flows along the strip edges of the open-seam tube to the point at which the strip edges abut (welding point), and the ensuing concentration, promoted by the proximity of the negative conductor, results in a high level of energy utilization. Below the Curie point (768 °C), the depth of current penetration only amounts to a few hundredths of a millimetre. Once the steel is heated above this temperature, it becomes non-magnetic and the current penetration depth rises to several tenths of a millimetre at frequencies in the region of 450 kHz.
Here is one picture of our machine HF Welder for your reference:
Elements of our HF Welder

Characteristic of our HF welder
1.All solid state high frequency induction heating power supply takes the modern power electronic devices MOSFET module as the key devices of inverter
2.A SCM system as the core as a rectifier . Inverter intelligent control system, with high efficiency,the circuit is simple and reliable,convenient to operate,small size and other advantages,
3. It isnot only can produce change the production proces improve product quality,and has obvious energy saving effect.And the use of the programmable controller as an external remote controller could enhance the working efficiency l of the whole production line