Method for producing a brazing wire and resulting brazing wire

A method for formation of a brazing wire, comprising:

• first, unwinding a solid metal or metal alloy wire, of circular cross-section;
• subjecting said wire to a stamping operation between rotating rollers, a periphery of said rollers respectively having a die for receiving said wire and a punch capable of deforming the wire and of generating a U-shaped cross-section of said wire across an entire original diameter of said wire;
• filling a volume defined by the U-shaped cross-section by means of a brazing flux or pickling flux in powder or paste form;
• closing arms of the U-shaped cross-section, after the step of filling of the volume with the brazing flux or with the pickling flux, such that a first arm of the arms of the U-shaped cross-section is disposed on top of a second arm of the arms of the U-shaped cross-section with an end of the first arm overlapping an end of the second arm;
• calibrating and of conforming the wire now filled with the brazing flux or with the pickling flux, according to a desired diameter and cross-section,
• wherein the stamping of the metal or metal alloy wire is performed so as to define a differentiated deformation of said wire between a center or middle of the wire and the ends of the first and second arms of the U-shaped cross-section, so as to define a cored brazing wire having an outer metal or metal alloy wall having a constant thickness.