Silver brazing wire is a metal filler, typically an alloy of silver, copper, zinc, and sometimes cadmium, used to join metals by melting at a lower temperature (above 800F/425C) and flowing into tight joints via capillary action, creating strong, sealed, leak-proof bonds without melting the base metals, ideal for joining dissimilar metals in applications like HVAC, automotive, and aerospace.
Key Characteristics:
Composition: Contains silver, copper, zinc, and sometimes cadmium, with silver content influencing melting point and performance.
Melting Point: Lower than base metals, typically between 1100F (600C) and 1470F (800C).
Strength: Forms strong, ductile, and corrosion-resistant joints, often stronger than the base metals themselves in some cases, say The Silver Institute.
Process: Requires flux to remove oxides, uses heat from torches, furnaces, or induction, and relies on capillary action to draw the molten filler into the gap.
Versatility: Joins ferrous (iron-based) and non-ferrous metals like steel, copper, nickel, and stainless steel, but not aluminum or magnesium.