Induction brazing system for cooled conductor joints

Paper presented at the 4th National Welding Day, Workshop: “Brazing” Genoa, 25–26 October 2007.

Abstract

This paper is based on the experience gained in the development and setting up of a hard brazing procedure of butt joints by induction heating method, adopted for the manufacturing of copper conductor lengths of rectangular section, with two cooling channels inside.

Such conductor has been used by ASG Superconductors for the winding of the resistive coils of the dipole magnets for the Synchrotron Ring at the ‘Centro Nazionale di Adroterapia Oncologica’ of Policlinico S. Matteo Hospital in Pavia.

This will be the first such machine in Europe and shall distinguish for the type of particles used (hadrons) and the energy levels applied.

This paper describes the contractual requirements, the phases of the selection of the brazing machine, the jigs and tools used for the manufacturing and the tests, the final process adopted and the results obtained.

Keywords:

• brazing
• butt joints
• copper
• induction brazing
• leads
• mechanical properties
• process parameters

Acknowledgements

The authors thank EDF for providing an important contribution towards definition of the inductive heating system, with particular reference to the design and manufacture of the inducers.

Notes

Paper presented at the 4th National Welding Day, Workshop: “Brazing” Genoa, 25–26 October 2007.