The types of filler metal in brazing include tin-lead solder, silver-based filler metals, copper-based filler metals, manganese-based filler metals, nickel-based filler metals, and precious metal filler metals. Each type is chosen based on the specific requirements of the materials being joined and the desired properties of the final assembly.
Tin-lead Solder is primarily used for soft brazing of stainless steel. It is characterized by a higher tin content, which enhances its wetting ability on stainless steel surfaces. However, due to its relatively low shear strength, it is typically used for parts with low load-bearing requirements.
Silver-based, Copper-based, Manganese-based, Nickel-based, and Precious Metal Filler Metals are used for various brazing applications, depending on the specific properties required for the joint. These metals offer different melting points and mechanical properties, making them suitable for a wide range of materials and applications. For instance, nickel-based filler metals are often used in furnace brazing or as coatings due to their high strength and resistance to high temperatures.
Filler Metal Alloys in the 4000 series, particularly those close to an aluminum-silicon eutectic composition, are known for their low melting points and limited liquidus-solidus interval. These properties make them ideal for specific brazing processes where precise temperature control is necessary.
Application of Brazing Filler Metal involves careful selection and placement of the filler metal in the joint area, typically in the form of a preform, paste, or wire. The choice of filler metal is crucial as it directly impacts the strength and integrity of the brazed joint.
Brazing in the Vacuum Furnace requires high-purity filler metals that are free from contaminants to prevent oxidation or other undesirable reactions. The use of special binders and non-toxic diluents ensures that the brazing process is safe and environmentally friendly.
In summary, the selection of filler metal in brazing is a critical step that depends on the specific needs of the materials being joined and the operational conditions of the brazing process. Each type of filler metal offers unique properties that make it suitable for particular applications, ensuring the durability and reliability of the brazed joints.
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