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Modular Impeders

moduleimpederModular Impeders provide an economical & highly efficient alternative to the clusters of small impeders that are frequently used to weld tubing in the 38mm to 150mm range.

The modular impeders consist of a central tube surrounded by one or more ferrite cores. This core assembly is supported by an I.D. scarfing mandrel, or a length of non-ferrous pipe or tubing. An outer casing made from high temperature Silglass™ or similar tubing fits over the core assembly to protect the ferrite & direct the flow of coolant. Replaceable end caps fit into each end of the casing & are held in place by means of shaft collars that grip the mandrel or support tube. Different types of end caps are available to allow different coolant inlet & outlet options.

Because these modular impeders are only held in place by the collars at both ends, the entire impeder can be rotated on the support structure if the casing suffers heat damage in the vicinity of the weld. This greatly extends the life of the impeder. The outer casing can also be easily replaced, since no fasteners are used to retain it. The casing is held in place only by flanges on the end caps, which are in turn retained by the collars.

Coolant can be supplied to the impeder either through the center support tube or mandrel, which is the preferred method, or by means of separate coolant tubes. Numerous mounting & coolant delivery options are possible using these impeders.

CORE ASSEMBLY. The core assembly consists of an epoxy/glass tube with a ferrite core slightly bonded to its outer surface with silicone RTV adhesive . If individual rods should require replacement, they can be easily peeled away from the silicone & new rods can be installed to replace them.


END CAPS. Two types of end cap are available. For through flow operation, one “closed” cap and one “ported” cap are used. “Ported” caps have 3 or 6 coolant outlet ports for coolant discharge. “Closed” caps a resealed with o-rings and may have auxiliary coolant couplings fitted to them for use with external coolant supply lines. For return flow operation, “two closed” caps are used.


OUTER CASING. The outer casing of the impeder serves to protect the ferrite & direct the coolant flow. Several materials are available , including Silglass™, a high temperature glass reinforced silicone; Fluorglass™ , our new glass filled PTFE plastic, and Ferroglass™ , our unique ferrite filled epoxy/glass tubing for maximum weld speeds. Quartz or ceramic casing is also available in some sizes.