1.Classification of brazing materials1. According to the melting temperature range

(1) Materials with a melting point below 450 degrees Celsius are called soft brazing materials, such as tin-based, bismuth-based, lead-based, indium-based, zinc-based alloys, commonly heated using soldering irons.

(2)

　　Materials with a melting point above 450℃ are called hard brazing materials (commonly known as difficult-to-melt brazing materials), such as zinc-based, aluminum-based, gold-based, magnesium-based, copper-based, manganese-based, nickel-based, silver-based, palladium-based alloys. Their heating sources include torch flames, resistance heating, induction heating, salt bath heating, and furnace heating.2. According to the main alloy elements

They can be divided into tin-based, lead-based, and aluminum-based according to their main alloy elements.

3. According to the shape of the material

Brazing materials can be divided into wire-shaped, rod-shaped, sheet-shaped, foil-shaped, powdery or special shapes (such as ring-shaped or paste-like).

2.

Selection of brazing materialsClassification of brazing materials(1) Brazing materials should have an appropriate melting temperature range, at least several degrees lower than the melting temperature of the base material.

(2) At brazing temperatures, they should have good wettability to ensure that the gap in the brazed joint is fully filled.

(3) Brazing materials and base materials should have diffusion properties for a strong bond.

(4)

　　They should have stable and uniform composition to minimize the loss of alloy elements during the brazing process.Classification of brazing materials(5)

　　The obtained brazed joints must meet the technical requirements of the product and satisfy the requirements for physical and chemical properties, mechanical properties, and performance.(6)

　　The economic efficiency of brazing materials should be good. They should contain minimal or no rare metals and precious metals. High production efficiency for brazing should also be ensured.(7)

　　They should have the ability to undergo deformation for easy shaping into various forms.Classification of brazing materials应该有加工变形的能力，方便将它制成各种形状。