Brazing of short circuit rings for various squirrel cage induction and traction motors in the electrical apparatus production and repair industry can be carried out efficiently using induction heating. The method is really simple and the end result can be precisely repeated. Two methods of short circuit ring brazing are single shot and segment.

Single shot:
The short circuit ring is placed on the ring inductor (induction coil), which is approximately the same size as the short circuit ring. The rotor core and rods or bars are assembled and inserted into the short circuit ring’s bar or rod connection slots. The braze alloy in the form of pellets or preformed shapes are added. The brazing process is started, the temperature is controlled, and the induction systems output power is regulated by an optical pyrometer.

Segment:
This segment process is utilized for extremely large rotors or segmented repairs. With the segment method the ring is assembled as above. However, the inductor is designed to heat only segments of the ring that may have only 2-10 bar or rod connections to the ring on it. This method is common with large motor mortise connections.
Eldec Induction offers turn-key systems and solutions for your production and repair requirements.

Unit description:
HF-Generator
Eldec Type HFG 10-4

Brazing of tube parts can be carried out with fluxing agent and silver filler as well as with high melting copper filler metals and protective gas. Depending on the number of pieces HF or MF generators with one or several outputs are utilized. Our example shows a 10 kW HF generator, type Eldec HFG 10-4 with 4 switch-able outputs.