The material selection for drill brazing rack mainly depends on the type of drill bit and the working environment.
Material selection criteria
Type and quality of diamond composite sheet: Different types and qualities of diamond composite sheets require different brazing materials to ensure welding quality and effect.
Performance and characteristics of brazing materials: The performance and characteristics of brazing materials directly affect the firmness and durability of the drill bit, so it is necessary to select brazing materials with good welding performance and high strength.
Welding process and conditions: Different welding processes and conditions require different brazing materials to ensure welding quality and effect.
Common materials and their characteristics
Silver-based brazing material: It has high strength and good welding performance and is suitable for brazing of PDC drill bits. Silver brazing rods can maintain stable welding quality and effect in harsh working environments, and the welding temperature is low, reducing thermal damage to diamond composite sheets.
Copper-based brazing material: It is suitable for brazing PCBN tools that require high strength and low defects. Copper-based brazing filler metal performs well at high temperatures and is suitable for cemented carbide welding.
Cadmium-free silver brazing materials: in line with environmental protection trends, suitable for welding of small drill bits.
Impregnated alloys: such as copper-nickel-manganese-zinc and copper-nickel-manganese-tin series, suitable for sintering of oil matrix drill bits with different requirements.
Specific application examples
PDC drill bits: the commonly used brazing material is silver brazing rods, which are one of the important choices for PDC drill bit brazing materials due to their high strength, good corrosion resistance and low welding temperature.
PCBN tools: using high-strength and low-defect copper-based and silver-based brazing filler metals, suitable for brazing of superhard tools such as CNC tools and oil drill bits.
Geological drilling tools: according to the working conditions, cadmium-containing silver brazing filler metal, cadmium-free silver brazing filler metal, copper brazing filler metal or impregnated alloys are selected, which are widely used in solid minerals, oil and gas, hydrogeology and other fields.