描述
Tungsten needles’Characteristics
Tungsten is a metallic element with the chemical symbol W and atomic number 74. It is known for having the highest melting point of all metals (about 3,422°C) and excellent strength at high temperatures. Tungsten also has high density, high hardness, good electrical conductivity, and strong resistance to wear and corrosion.
Because of these properties, tungsten is widely used in electrodes (such as tungsten needles and TIG welding electrodes), filaments, heating elements, plasma and vacuum equipment, aerospace, electronics, and high-temperature industrial applications.
Why used tungsten for tungsten needle?
Tungsten is chosen as the material for tungsten needles because it possesses comprehensive properties that are difficult for other metals to replace. It meets the requirements of electrodes used under high-temperature, high-energy, and high-stability conditions. Specifically：
1.Extremely High Melting Point Tungsten needles
Tungsten needles are known for their extremely high melting point, making them ideal for high-temperature industrial applications such as plasma welding, arc welding, cutting, and electric discharge processes. These applications require materials that can withstand intense heat without melting, deforming, or losing structural integrity.With a melting point of approximately 3410°C, tungsten offers exceptional thermal resistance. Unlike conventional metals that melt or vaporize in electric arc or plasma environments, tungsten remains solid and stable. This allows tungsten needles to maintain precise tip geometry, ensuring consistent performance, arc stability, and extended service life in demanding working conditions.
2.High Hardness and High-Strength Tungsten Needles
High-hardness tungsten needles provide superior durability and wear resistance compared to most metal materials. Their exceptional strength makes them suitable for precision applications in industries such as medical devices, electronics manufacturing, automotive production, and thermal spray systems.
With a density of approximately 19.3 g/cm³, tungsten is one of the densest metals available. This high density improves stability, accuracy, and control, enabling precise cutting, machining, and processing without damaging the workpiece. In addition, tungsten maintains excellent mechanical strength at elevated temperatures, resists deformation, and significantly extends electrode and needle service life, reducing replacement frequency and operating costs.
3.Good Electrical Conductivity
Tungsten is an excellent conductor of both electricity and heat. This inherent property makes tungsten needles ideal for applications requiring reliable conductivity or rapid heat dissipation. Its stable conductivity ensures uniform current transmission, making the discharge or welding process more stable.
4.Ideal Electrode Material
Tungsten needles’ excellent electrical conductivity makes them the preferred tungsten electrode material, especially in applications where current and heat management stability and efficiency are critical.
5.Brittleness
Despite its excellent strength and hardness, tungsten has a significant drawback: relative brittleness.(Tungsten needles are inherently brittle. Therefore, extreme care must be taken when handling these sharp instruments. Damage Risk: Users must handle them with care, avoiding mechanical impacts or excessive pressure, which may cause the delicate, sharp needle tip to bend or break.)
6.High Temperature and Ablation Resistance
Under high temperature and strong arc conditions, tungsten is not easily ablated or volatilized, reducing electrode consumption.
7.Good Chemical Stability
Tungsten exhibits resistance to chemical corrosion and good resistance to various media at high temperatures, making it resistant to chemical corrosion.
8.Easy to Fabricate Fine Needle Tips
Tungsten materials are suitable for precision machining and can be fabricated into needle tips of different angles and shapes to meet the needs of various applications such as welding, plasma spraying, and negative ion generation.
Because of these advantages, tungsten has become the preferred material for tungsten needles and various high-temperature electrode materials.
Types of tungsten needle
The choice of tungsten needle tip angle and grinding requirements under different application scenarios determine the application of the tungsten needle.
The tip angle of tungsten needles varies significantly depending on the application scenario, with common angles ranging from 20 degrees to 90 degrees. The specific selection must match specific process or testing requirements. Commonly used tungsten needle tip angles include 15°, 30°, 45°, and 60°. Furthermore, the tip angle is closely related to the current; the larger the cone angle, the greater the welding current it can withstand.
Application Types and Tip Requirements
tungsten discharge needle can be used in the medical field, resistance welding, semiconductor manufacturing, and static electricity elimination, such as medical tungsten needles, tungsten probes, tungsten array needles, air purification device needles, ion fan emission needles, and ion snake discharge needles.
Tungsten Needles for TIG Welding
Tilt Shape: Conical
Recommended Angle: 15–30°
Features: Concentrated arc, stable arc initiation, good weld formation
Requirements: High tip concentricity to prevent arc drift caused by uneven wear
Tungsten Needles for Plasma Equipment
Tilt Shape: Precision conical or micro-rounded
Radius of Curvature: 0.1–0.3 mm
Features: High temperature resistance, ablation resistance, dimensional stability
Requirements: High surface finish, suitable for plasma spraying and micro-electrostatic equipment
Tungsten Needles for Negative Ion Generators
Tilt Shape: Ultra-sharp needle
Recommended Angle: 10–20°
Surface Roughness: Ra ≤ 0.4 μm
Features: High discharge efficiency, long lifespan, and good consistency
Tip angle selectable (customized according to application)
Welding: 15–30°
Discharge: 10–20°
Spraying: 30–45°
Industrial testing (needle penetration test): 45–60°
Precision measurement: 30°
Custom tip angle and shape available according to drawings or application requirements.
Machining and Quality Standards
Concentricity deviation: ≤ 0.05 mm
Dimensional tolerance: ±0.01 mm
Surface finish: Crack-free, burr-free
Machining process: Diamond wheel grinding + fine polishing
Designed for professional and industrial users, these tungsten needles / electrode needles are widely used across precision, electrical, and high-temperature applications,such as ,Electro-micro-dissection，Ion emission and static discharge control，LED and LCD testing ESD (electrostatic discharge) applications，Jewelry, watch, and clock repair，Laboratory research and testing，General industrial use: electrode needles, discharge needles, welding needles， Suitable for welding, plasma, discharge, and industrial testing applications
Conclusion
Tungsten needles are primarily valued for their high melting point, hardness, and excellent electrical conductivity, making them indispensable in many advanced technical and industrial applications. Their ability to function effectively under extreme heat, pressure, and electrical demands ensures that they remain critical components in fields ranging from electronics and medicine to aerospace and laser technology.
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