brazing

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Brazing is a joining process whereby a non-ferrous filler metal, alloy is heated to melting temperature (above 800°F) and distributed between two or more close-fitting parts by capillary attraction. At its liquidus temperature, the molten filler metal interacts with a thin layer of the base metal, cooling to form an exceptionally strong, sealed joint due to grain structure interaction. The brazed joint becomes a sandwich of different layers, each metallurgically linked to eachother. The brazing process can employ various heat sources such as torch, flame, acetylene, gas/air, induction, resistance, infrared,oven, and furnace. The process of brazing uses filler metals and alloys such as silver, copper, zinc, cadmium, etc. Flux is necessary for brazing to remove and prevent reformulation of surface oxides on the base metals. The brazing process produces strong, sealed, leak-proof joints. Brazing uses filler metals in solid form, like rings and wire, slugs, washers, powder, and paste. Proper brazements begin with a good joint design. Brazing produces joints that meet specifications that meet mechanical performance, electrical conductivity, pressure tightness, corrosion resistance, and service temperature. High production, metal joining operations often employ brazing.

Automatic brazing and soldering machines