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The ferrites are produced with iron oxide, cobalt, nickel, manganese and zinc. After being mixed, they are pressed in accordance with the desired shape. It is sintered in furnaces with controlled atmosphere for high temperatures (1200 -1400°C). Its final surface must be polished. The result of such process is a highly breakable, extremely hard material. The ideal ferrite must have a high magnetic resistance without holding magnetism. The exposed welded area causes the ferrite temperature to raise and therefore lose its magnetic properties.

This phenomenon is known as “Curie point”, which states that progressively higher temperatures (above of 250°C) provide a gradually higher quality ferrite.


FERRITE - FUNCTIONS

The process of tube welding by high frequency inductions generates a high magnetic field which in turn induces the flow of electric current around the external tube surface near the coil.

As a result of intense activity, the electric current flows through the internal and external faces in the surface layer of the pipe causing a small penetration (“SKIN EFFECT”).

Most part of this current flows through the internal surface, causing an undesired heat increase along the entire tube.

To prevent energy loss and direct it only into the “V” welding area, it is necessary to increase the impedance of the internal faces. This is achieved by using suitably-adjusted magnetic properties of the ferrite batons during the welding process.


MAGNETIC CHARACTERISTICS

• Initial permeability (µi) = 1,000 ± 25%
• Curie Point (CP) = 250°C
• Magnetic saturation 23°C. = 450 TM
  
  

ZR +details	ROUND SOLID
ZRF +details	ROUND SOLID WITH FLATS
ZRH +details	ROUND WITH HOLE
ZRS +details	ROUND SOLID WITH SLOTS
ZRSH +details	ROUND WITH SLOTS AND HOLE