Which connection method of carbide drill has a long service life
In terms of connection strength and service life, brazing is generally considered to be the best method for connecting tungsten carbide buttons to roller bits. The following is a detailed comparison of the connection strength and service life of the three methods:
Connection Strength
Brazing method:
The metallurgical bonding between the tungsten carbide button and the drill bit base is achieved by melting the brazing material at high temperature.
The connection strength is high and can withstand large drilling forces and torques.
The joint is dense and complete, with good performance, and the high-temperature tensile strength can reach 60% or even higher than the parent material strength.
Mechanical pressing method:
The tungsten carbide button is pressed into the reserved hole in the drill bit base by mechanical force.
The connection strength is moderate, but may be affected by the accuracy of the pressing tool and equipment.
Under long-term high-load operation, the connection may become loose or worn.
Adhesive method:
The tungsten carbide button is bonded to the drill bit base by using a specific adhesive.
The connection strength is relatively low and mainly depends on the strength and durability of the adhesive.
In harsh drilling environments, the adhesive may fail due to aging, corrosion, etc.
Service life
Brazing method:
Due to the high connection strength, it can withstand long-term drilling operations without loosening or falling off.
The joint has good heat resistance and corrosion resistance, and can maintain stable performance in harsh drilling environments.
Therefore, the service life of the brazing method is usually longer, which can meet the needs of high-intensity operations such as deep well drilling and hard rock drilling.
Mechanical pressing method:
The service life is affected by the connection strength and the accuracy of the pressing tool.
Under long-term high-load operation, the connection may become loose or worn, resulting in a shortened service life.
Adhesive method:
The service life mainly depends on the strength and durability of the adhesive.
In harsh drilling environments, the adhesive may fail due to aging, corrosion, etc., resulting in a shorter service life.
In summary, the brazing method performs best in terms of connection strength and service life. However, the specific method to be selected still needs to be comprehensively considered based on drilling needs, cost budget and production conditions. In practical applications, the most suitable insertion method should be selected according to the specific situation to ensure the performance and life of the drill bit.
