Induced current heating probe

An induced current heating probe of the kind which can be entered into a tube to effect a braze at an external circumferential region of said tube, which probe has an electrically conductive external sheath closed at one end and which serves as both an electrical and cooling water conduit, has a flux-generating unit in the form of a stack of ferrite cores with a solid energising winding inside but spaced from the sheath and has a coaxial tube which also serves as both an electrical and cooling water conduit;

• the winding being electrically connected at one end with the coaxial tube and at the other end with the external sheath;
• the cores having openings defining a water flow passage through the stack;
• non-magnetic insulating rings between the cores in the stack;
• said coaxial tube communicating with the water flow passage, and the water flow passage communicating with the space between the sheath and the flux generating unit;
• the assembly of sheath, flux-generating unit and coaxial tube being arranged such that they accept series flow of both current and water with the flux-generating unit flooded with the water flow.