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Brazing process: the workpieces cleaned on the surface are assembled together in a lapping type, and the filler metal is placed near or between the joint gaps. When the workpiece and filler metal are heated to a temperature slightly higher than the melting point of the filler metal, the filler metal melts (the workpiece is not melted), and is sucked into and filled with the gap between the solid workpiece by capillary action. The liquid filler metal and the workpiece metal are mutually diffused and dissolved, and the brazing joint is formed after condensation.