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IP.com Disclosure Number: IPCOM000224557D
Publication Date: 2012-Dec-31
Document File: 4 page(s) / 302K

Publishing Venue

The IP.com Prior Art Database


The invention puts forward a method to manually adjust the induction braze coil head. Previous efforts to make the coil head adjustable used complicated air cylinders for clamping as well as clamps were added to the outside of the coils to fix with the work piece. This invention devises a methodology which uses a lever action with a manual adjusting screw and knob wherein the operator can manually tighten the induction coils housed inside insulated ends. Advantages of this invention are quicker induction heating of braze joint and reduction of insulation material and reduced rework.

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The invention relates to induction brazing where two or more piece of metals are joined together with a third, molten filler metal. In case of conventional rigid induction head with a fixed distance between coils, induction heating of the braze joints is inadequate and inefficient due to air gap between coil insulator and work piece. The conventional coil design also does not allow use on different generator designs, and the glued and molded insulation is difficult to repair or change. Other attempts to provide adjustable induction coils have used complicated air cylinders and external clamps to secure them to the work piece. This invention discloses a manually adjustable braze coil head which is used to braze generator series loop connections from stator bars to end plates, that addresses the above drawbacks.


This invention proposes adjustable braze coil designs in which:

Figure 1 illustrates braze coil with adjustable knob. 

Figure 2 illustrates a detailed view of braze coil with adjustable knob.

Figure 3 illustrates braze coil with pivot point.


This invention uses a lever action with a manual adjusting screw and knob as shown in Fig. 1. The induction coils placed inside the insulated ends can be tightened around the work pieces.

FIG. 1: Braze coil with adjustable knob

To prevent unintentional heating, adjustment screws are made out of either high temperature plastic (G-10 or G-11 sheets) or ceramic. Different versions of the adjustable coil design were developed to include single and double adjustment knobs, ceramic and mica sheet coil insulators, and stainless steel insulation "toe...