TC Tungsten Carbide Core Bit Wear Resistant For Geotechnical Soil Investigation

Tungsten Carbide Core Bit

The Tungsten Carbide Core Bit, also known as a T.C. Core Bit or TC Core Bit, is a cost-effective coring tool designed primarily for geotechnical soil investigation, overburden drilling, engineering exploration and core drilling in relatively soft formations.

Tungsten carbide cutting elements are embedded or bonded into a tough metal crown. During rotary drilling, the carbide cutters remove the formation around the outside of the core while the hollow center allows a cylindrical sample to enter the core barrel.

Regular tungsten carbide core bits are commonly manufactured with rectangular or octagonal carbide elements. Crushed carbide core bits use multiple carbide particles bonded into a metal matrix, allowing new cutting edges to become exposed as the matrix gradually wears.

Brighttop Global Co., Ltd. can supply TC core bits with different cutter arrangements, crown heights, waterways, diameters and connections. The correct design should be selected according to formation hardness, abrasiveness, consolidation, drilling depth, core barrel type and operating parameters.

Key Features

• Tungsten carbide cutting elements
• Tough and wear-resistant crown structure
• Suitable for soil, overburden and soft formations
• Reliable cutting performance at relatively low drilling speeds
• Regular carbide and crushed carbide options
• Multiple crown and waterway configurations
• Suitable for core recovery and formation sampling
• Different diameters and connections available
• Compatible with selected wireline and conventional core barrels
• Customized specifications available

Tungsten carbide core bits are generally intended for softer, unconsolidated or weakly consolidated formations. Product selection should not describe them as universal bits for all hard and abrasive rocks unless field testing and the specific bit design support that claim.

Main Applications

• Geotechnical soil investigation
• Engineering geological investigation
• Overburden core drilling
• Site investigation
• Foundation investigation
• Soft-rock core sampling
• Clay and sand formation drilling
• Gypsum formation drilling
• Soft shale drilling
• Shallow geological exploration
• Dam and tunnel investigation
• Construction drilling projects
• Hydrogeological investigation
• Borehole cleaning in suitable conditions

Manufacturer guidance commonly positions TC core bits for overburden and formations containing materials such as clay, sand, gypsum and soft shale.

Suitable Formation Conditions

Tungsten Carbide Core Bits may be suitable for:

• Clay
• Sand
• Weathered formations
• Soft shale
• Gypsum
• Coal and similar soft formations
• Unconsolidated overburden
• Weakly cemented sedimentary formations
• Soft to selected medium-soft rock
• Formations requiring economical shallow coring

Performance will depend on the exact carbide grade, cutter shape, cutter exposure, crown design, water flow, rotational speed and bit pressure.

Product Types

1. Regular Tungsten Carbide Core Bit

A regular TC core bit uses individually positioned rectangular, octagonal or specially shaped carbide cutters.

Typical advantages:

• Aggressive exposed cutting edges
• Simple and durable cutting structure
• Suitable for soft and unconsolidated formations
• Easy selection for common soil-investigation projects

2. Crushed Tungsten Carbide Core Bit

A crushed carbide core bit contains carbide chips distributed through a metal-bond crown.

Typical advantages:

• More cutting edges across the bit face
• New carbide particles are exposed as the bond wears
• More even crown wear in suitable formations
• Useful when a self-renewing cutting surface is preferred

The crushed-carbide design relies on controlled wear of the metallic bond to expose additional carbide cutting edges.