The cross-sectional area of the impeder should be 70%-75% of the pipe inner diameter cross-sectional. If lower than 70%, efficiency will obviously reduce. The impeder used in H.F pipe welding has high initial permeablility. UA>=800 saturation flux Dichte BS -Wert von mehr als 3000 g, die Curie -Temperatur so hoch wie möglich und niedriger Verlust so hoch wie möglich . In Betrieb. Die Impederkühlung sollte ausreichend sein, um den zerbrochenen Magneten oder ineffektiv zu verhindern, wenn die Temperatur den Curie -Punkt . überschreitet
The length and position of the impeder both have the effect on welding efficiency. The impeder total cross-sectional area and length should adjust to the welding pipe diameter. Usually, when welding large diameter pipe, the impeder length should be less. But the VEE shaping side should exceed the squeezing roll central line.
