Impedors

Standard Through-Flow Impedors:

Standard Through-Flow Impedors are the most widely used type of impedor in the tube and pipe production industry. Designed to to use solid, fluted ferrite rods in order to ensure sufficient cooling, they consist of one or more ferrite cores inside a casing of either ferroglass or silglass.

Standard modules are available with diameters ranging from 6.5mm to 114mm, in lengths of 230, 330 and 432mm and above.

Return Flow Impedors:

Return Flow Impedors are recommended for welding applications whereit is necessary to keep the inside of the tube dry. Coolant enters and exits the impedor through a special coupling and is discharged outside of   the tube.

Standard models are available with diameters ranging from 10 mm up to 76 mm in lengths of 230, 330 and 432 mm and above.

Exposed Ferrite Impedors:

Exposed Ferrite Impedors offer an efficient alternative for smaller diameter tubes as they allow positioning of the ferrite in the welding zone without fear of the casing burning away. 

Exposed ferrite impedors are ideally suited for welding hot rolled strip, aluminised or pre-galvanised strip, stainless steel and other difficult materials. They are also the best choice for air or inert gas cooled applications.

Standard models are available with diameters ranging from 8 mm up to 25 mm with a length of 230 mm.

Over Mandrel Impedors:

Over Mandrel Impedors are designed for applications where more rigidity is required during the internal scarfing, provided there is adequate space available.

These impedors are available with diameters from 76 mm to 152 mm in standard lengths of 430 mm and 635mm.

Impedor Cluser Assemblies:

Cluster Impedors are recommended for larger tubes and pipes with diameters greater than 102 mm. They are an assembly of standard impedors connected to a manifold through which the coolant enters. The cluster manifold is supported by the mandrel and fixed into position using a clamp manufactured to suit the customer’s mandrel diameter. 

The impedor cluster gives the possibility of economically positioning the ferrite in large tubes without resorting to costly, oversized, single pieces of ferrite. The use of individual standard impedors also enables fast and economical replacement of any damaged parts, as and when required.

On pipe sizes > 200 mm it is not usually necessary for the impedor to completely cover the inside surface of the pipe. Positioned where ferrite is needed, cluster assemblies normally span around 180º of the inside surface of the pipe being induction welded.