Tungsten Carbide brazed tips

Tungsten Carbide Brazing Tip is a component that connects tungsten carbide with other metals or alloys through the brazing process.

Products Provided by Kedel

The model classification of tungsten carbide brazing tips is typically related to industry applications, structural design, or performance characteristics. The following are welding blades that comply with international standards.

A

B

C

D

E

G

Application Scenarios of brazed tips

With its extraordinary performance and diverse functions, tungsten carbide brazing tips gallop freely in the industrial world, and the breadth of their application fields far exceeds imagination.

Metal Processing Field

Mining and Geological Engineering

Wood and Non - metal Processing

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What is a tungsten carbide brazed tips?

Tungsten carbide brazed tips play a crucial role in multiple industries, thanks to their remarkable characteristics. In metal cutting operations, they can sharply cut various hard metals, ensuring high – precision machining. During rock drilling tasks, their high hardness and wear resistance enable efficient penetration of tough rock formations. In woodworking, they can smoothly carve and shape wood materials with high accuracy.

The manufacturing process mainly involves brazing technology. First, tungsten carbide inserts are accurately positioned on the tool body. Then, through a brazing process at appropriate temperatures, a firm metallurgical bond is formed between the tungsten carbide and the base material. Finally, precision grinding and inspection are carried out to ensure the dimensional accuracy and cutting performance of the brazed tips.

With such excellent performance, tungsten carbide brazed tips are widely applied in key equipment, including metal cutting lathes, milling machines, rock drilling rigs in mining operations, woodworking routers, and also in some precision machining devices like CNC engraving machines, all depending on them to achieve efficient and stable processing operations.

Types of Tungsten Carbide brazed tips

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A Type

Structural Feature：Compact trapezoidal profile with a rounded top edge, optimized for balanced stress distribution during cutting.
Functional Advantage：Provides stable cutting force transmission, reducing edge chipping risk on brittle materials.
Typical Applications：Precision woodworking (e.g., furniture component carving), soft metal finishing (e.g., aluminum deburring).

B Type

Structural Feature：Angled cutting face with a sharp leading edge, designed for aggressive material removal.
Functional Advantage：Delivers high shearing efficiency on tough surfaces, minimizing tool wear under heavy load.
Typical Applications：Heavy-duty metal machining (e.g., cast iron roughing), rock drilling auxiliary blades.

C Type

Structural Feature：Rectangular base with a flat cutting plane, ensuring uniform contact with workpieces.
Functional Advantage：Guarantees consistent cutting depth and surface finish in large-area processing.
Typical Applications：Sheet metal cutting (e.g., stainless steel slitting), ceramic tile edge trimming.

D Type

Structural Feature：Asymmetric wedge shape, engineered for directional force focusing.
Functional Advantage：Enables precise chip control and debris evacuation in narrow-channel operations.
Typical Applications：Groove machining (e.g., engine cylinder slots), composite material trimming.

E Type

Structural Feature：Polygonal cutting geometry with multi-edge design, maximizing usable surface area.
Functional Advantage：Extends tool life through alternating edge usage, ideal for high-volume production.
Typical Applications：Mass manufacturing of hardware parts (e.g., bolt head forming), abrasive material grinding.

G Type

Structural Feature：Dual-material brazed structure with a reinforced tungsten carbide tip, enhancing impact resistance.
Functional Advantage：Combines hardness with structural toughness, suitable for intermittent cutting cycles.
Typical Applications：Mining equipment repair (e.g., excavator bucket teeth), construction material crushing.

What You Need to Know About Common Parameters ？

Understanding the parameters of tungsten carbide brazed tips is crucial for accurately matching working condition requirements, ensuring processing quality and efficiency, optimizing costs, and maintaining stable equipment operation, so as to fully unleash their performance in various application scenarios.

Material Composition

Tungsten Carbide (WC) Content: Usually > 80%, and over 90% for some models, serving as the main hard phase.
Binder Phase: Mainly cobalt (Co) (content 5% – 15%). Alloying elements like chromium (Cr), molybdenum (Mo) can be added to enhance performance.

Physical Properties

Hardness: Coating surface hardness > HRC 72; hardness at 900℃ high temperature ≥ 58 HRC.
Bonding Force: Bonding force between the coating and the matrix ≥ 483 MPa (70,000+ psi) to prevent peeling.
Density: Approximately 14 – 15 g/cm³, with slight fluctuations affected by composition and process.

Brazing Process Parameters

Brazing Temperature: 680 – 740℃ for vacuum brazing; 850 – 950℃ for flame brazing.
Soaking Time: 15 – 20 minutes for vacuum brazing; 5 – 10 minutes for flame brazing.
Brazing Filler Metal Types: Silver – based brazing fillers (Ag – Cu – Zn series, with high strength and good wettability); Copper – based brazing fillers (Cu – Zn, Cu – Ni series, low cost).
Brazing Flux: Borax – boric acid series, used to remove oxide films and promote brazing filler metal spreading.

What are the welding methods for tungsten carbide brazed tips?

The welding methods for tungsten carbide brazed tips should be selected by combining their material properties (tungsten carbide features high hardness and strong thermal conductivity, with significant physical property differences from base metals) and application scenarios.

High-frequency Induction Brazing (Most Commonly Used)

Principle: Heating via high-frequency electromagnetic fields melts the brazing filler metal to bond tungsten carbide with the substrate.
Advantages: Rapid heating (tens of seconds to minutes), precise temperature control, suitable for complex shapes, widely used in mass production of cutting tools and drill bits.
Materials: Common copper-based or silver-based brazing fillers, paired with borax-based fluxes.

Furnace Brazing

Principle: Uniform heating for welding in a vacuum or protective atmosphere furnace.
Advantages: Even heating and oxidation-free environment, ideal for large structures or high-precision applications (e.g., aerospace tools).

Flame Brazing

Principle: Direct heating with oxy-acetylene flames to melt brazing filler.
Features: Simple equipment and low cost, suitable for on-site repairs. Requires neutral flame control to prevent tungsten carbide overheating.

Resistance Brazing

Principle: Welding completed by resistive heat generated from electric current.
Advantages: Concentrated heating and high efficiency, suitable for small brazed tips. Requires precise current control to avoid local overheating of tungsten carbide.

Recommendations for Selecting Welding Methods in Different Application Scenarios

Application Field	Typical Products	Recommended Welding Methods	Reasons
Metal Processing	Turning tools, milling cutters, drill bits	High-frequency induction brazing	High precision for mass production; avoids overheating at cutting edges to maintain hardness.
Mining & Geological Engineering	Rock drilling bits, prospecting bits	High-frequency induction brazing / furnace brazing	Large-sized and complex-structured bits require guaranteed welding strength and impact resistance; furnace brazing suits mass production.
Wood & Non-metal Processing	Woodworking tools, stone cutting saw blades	High-frequency induction brazing / flame brazing	Diverse tool sizes; flame brazing fits on-site repairs, while induction brazing suits standardized blade production.
Precision Parts	Micro-tools, electronic component processing tools	Resistance brazing / vacuum furnace brazing	Small size and high precision; vacuum environment prevents oxidation, and resistance heating enables precise

Common Welding Defects and Solutionsr?

Welding defects are mostly caused by improper heating temperature, incorrect selection of brazing filler metal, uncleared surface oxidation, or concentrated welding stress.

Cracking

Causes: Excessive heating/cooling rates, stress concentration, or excessively high brazing temperature.
Solutions: Optimize the heating curve, adopt slow cooling processes, and improve structural design (e.g., adding stress relief grooves).

Cold Welding/De-soldering

Causes: Dirty surfaces, insufficient brazing filler metal, or excessive/insufficient gaps.
Solutions: Strengthen surface pretreatment, control brazing filler dosage (thickness 0.05–0.1mm), and adjust assembly precision.

Deterioration of Tungsten Carbide Performance

Causes: Excessive temperature leading to coarse WC grains or chemical reactions with the substrate.
Solutions: Strictly control the brazing temperature (no more than 1000℃), select low-melting-point brazing fillers (such as silver-based), and shorten high-temperature residence time.

What Is the Replacement Cycle?

The replacement cycle of tungsten carbide brazed tips is significantly influenced by multiple factors such as processing materials, operating conditions, and equipment parameters, with no fixed standard. The following provides specific reference values and judgment bases combined with typical application scenarios

Reference for Replacement Cycle in Typical Application Scenarios

Application Scenario	Typical Working Condition	Replacement Cycle (Reference)
Metal Turning	Machining 45# steel, cutting speed 150m/min, feed rate 0.2mm/r	Continuous operation for 60 – 100 hours (or machining about 800 workpieces)
Metal Milling	Milling cast iron parts, milling speed 80m/min, milling depth 5mm	50 – 80 hours (or completing 600 – 1000 milling operations)
Wood Processing (Sawing)	Cutting hardwood (e.g., oak), sawing speed 60m/min	80 – 120 hours (or cutting 120 – 180 cubic meters of wood)
Wood Carving	Precision carving of softwood (e.g., pine), carving speed 25m/min	40 – 60 hours (wear amount shall be ≤ 0.05mm)
Mine Drilling (Soft Rock)	Drilling pressure 8kN, rotation speed 120r/min, sandstone formation	Replace every 60 – 100 meters drilled
Hard Rock Drilling (Granite)	Drilling pressure 18kN, rotation speed 80r/min, high – impact working condition	Replace every 15 – 30 meters drilled
Concrete Crushing	Road milling operation, continuous impact working condition	Cumulative use for 200 – 350 hours (depending on wear degree)

Replacement Judgment Criteria

I. Wear Degree

The wear amount of the cutting edge exceeds 0.3–0.5mm (for precision machining) or 2–3mm (for heavy-duty operations).
The detachment area of tungsten carbide particles exceeds 15%.

II. Deterioration of Processing Quality

Obvious burrs and scratches appear on the workpiece surface.
The cutting/drilling efficiency decreases by over 25%.

III. Abnormal Phenomena

Severe vibration or abnormal noise occurs during operation.
The tool tip temperature continuously exceeds 600°C (may cause brazed joint failure).

Suggestions for Extending Replacement Cycle

I. Optimize Processing Parameters

Adjust cutting speed and feed rate according to material characteristics to avoid overload (e.g., reducing cutting speed by 10%–20% when machining high-hardness alloys can significantly reduce tool wear).

II. Strengthen Cooling & Lubrication

Adopt high-pressure coolant or special cutting fluid to dissipate heat and remove debris promptly.
For high-temperature conditions (e.g., continuous cast iron cutting), use emulsified cutting fluids with excellent heat dissipation, maintaining a flow rate of 15–20L/min.

III. Conduct Regular Maintenance & Inspection

Clean debris from the tool tip surface after each operation to prevent abrasive particles from accelerating wear.
Use a magnifying glass to check brazed joints for looseness or micro-cracks; re-braze or replace the tool immediately if issues are found.

IV. Select Suitable Models

For high-wear scenarios (e.g., hard rock drilling), choose tips with high cobalt content (12%–15%) and coarse grains, improving impact resistance by 30%–50%.
For precision machining (e.g., aerospace parts), use ultra-fine grain tips (grain size <0.5μm), which can improve surface finish by 2–3 grades compared to conventional models.