Butt-joint brazing method for Kovar alloy and copper

The invention provides a butt-joint brazing method for a Kovar alloy and copper. The butt-joint brazing method for the Kovar alloy and the copper comprises the following steps: after a workpiece A made of the Kovar alloy and a workpiece B made of the copper are in butt joint, placing a proper amount of brazing filler metal and brazing flux at the joint, and then placing a heating rod of high-frequency induction heating equipment around the periphery of the joint; heating the brazing filler metal and the brazing flux to a preheating temperature and keeping for a proper time; heating to a melting temperature to melt the brazing filler metal, the brazing flux and part of materials of the workpiece to form a welding seam; and naturally standing the welding seam for a proper time, heating the welding seam to a melting temperature, keeping the melting temperature for a proper time, and naturally cooling the welding seam to normal temperature. By the adoption of the technical scheme provided by the invention, the he