The latest price of φ0.76x3x50mm tungsten filament is USD 1.20/PC on March 26, 2025, EXW XIAMEN, CHINA.

What is Tungsten Filaments?

Tungsten filaments, also called cathodes or electron emitters or electron sources, are mainly made of high-quality tungsten. Of all pure metals, tungsten has the highest melting point (3422°C), the lowest vapor pressure at temperatures above 1650°C, and the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of all pure metals. This combination of properties makes tungsten an ideal material.

Why Tungsten Filaments Are Used in Electron Gun?

Tungsten can be used in both thermionic electron guns and field-emission (CFE) electron guns. Electron beams come from filaments made of various materials. The most common is the tungsten hairpin gun, which is widely used in scanning electron microscopes, transmission electron microscopes, and microprobe systems. This filament is a tungsten ring that acts as a cathode. Apply voltage to the loop to heat it up. The anode, which is positive relative to the filament, forms a strong attraction to electrons. This causes electrons to be accelerated towards the anode. Some accelerate near the anode and down the column to the sample.

Why Are Tungsten Filaments in the Electron Gun Folded?

An electron gun works at a high temperature, which is required for thermionic emission. For this, a filament or the cathode should be of a material that has a high melting point in order for it to continuously emit electrons. Tungsten filament is folded with various shapes to help in focusing the electron beam.

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The latest price of Φ3.2x175mm thoriated tungsten electrode is USD 2.00/PC on March 26, 2025, EXW XIAMEN, CHINA.

What Is Thoriated Tungsten Electrode?

A Thoriated Tungsten Electrode is a type of tungsten electrode used primarily in Tungsten Inert Gas (TIG) welding and plasma arc welding (PAW). It is made by adding thorium oxide (ThO₂) to tungsten, typically in concentrations of 1% (WT10) or 2% (WT20) thorium.

Properties of Thoriated Tungsten Electrodes

Higher Electron Emission – Thorium improves electron emission, making arc starts easier and more stable.

Improved Arc Stability – Provides a smoother, more stable arc, reducing arc wander.

Higher Current Carrying Capacity – Can handle more current compared to pure tungsten, leading to better performance in DC welding.

Increased Electrode Life – More resistant to wear and contamination, resulting in a longer lifespan.

Good Resistance to Contamination – Less prone to oxidation and contamination than pure tungsten electrodes.

Applications of Thoriated Tungsten Electrodes

DC TIG Welding: Primarily used for welding carbon steel, stainless steel, nickel alloys, and titanium.

Aerospace and Industrial Welding: Due to its longevity and stability, it is widely used in precision welding applications.

Plasma Cutting and Welding: Works well in plasma arc welding (PAW) and plasma cutting torches.

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The latest price of Φ2.4x150mm cerium tungsten electrode is USD 1.80/PC on March 26, 2025, EXW XIAMEN, CHINA.

What is Cerium Tungsten Electrode?

Cerium tungsten electrode (WC20) is alloyed with about 2% cerium oxide. It is a non-radioactive, refractory or non-consumable metal electrode material, which is the preferred substitute for thorium tungsten electrodes. Regular diameter of the electrode is between 0.5mm and 12.0mm, and the length is 150mm and 175mm.

Characteristics of Cerium Tungsten Electrode

The addition of this small percentage of cerium oxide increases the electron emission qualities of the electrode which gives them a better starting characteristic and a higher current carrying capacity with no spitting. With the increase of cerium oxide content, the ablation resistance and arc starting of cerium tungsten electrode will increase; with the increase of use time, the welding performance will gradually decrease.

Cerium Tungsten Electrode Applications

The electrode has excellent arc starting properties at low current, and can operate successfully with AC or DC electrode negative. If used on higher current applications, the cerium oxide may be concentrated to the excessively hot tip of the electrode. In addition, WC20 is also used in inert gas shielded arc welding, hydrogen atom welding, argon arc surfacing, pulse argon arc welding, plasma welding, plasma cutting, plasma spraying, plasma melting, etc. The welding materials can be carbon steel, stainless steel, silicon copper, copper, bronze, titanium and so on.

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Tungsten alloy discs are small in size and heavy in specific gravity. They can be used as small parts for products that require high specific gravity parts. Tungsten alloy discs can be used as counterweights for racing cars, boats, speedboats, sailboats, airplanes, helicopters, rockets, tanks, etc. Tungsten alloy discs can also be used in the field of precision instrument manufacturing. Mobile phone vibrators, clocks, automatic watches, shockproof tool holders, and flywheel counterweights also use this product extensively.
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The tungsten alloy counterweight crankshaft is used to balance the rotational inertia force and moment generated by the connecting rod big end, connecting rod journal and crank, so that the engine crankshaft runs smoothly. Some counterweight crankshafts are made integrally with the crankshaft, which is an extension of the crankshaft, and some are separately made parts, which are fixed on the crank with bolts.

Tungsten alloy has the advantages of small size, high density, high hardness, high wear resistance, strong corrosion resistance, strong impact resistance, high melting point, high temperature resistance, environmental protection, etc. Tungsten alloy is definitely a suitable crankshaft material.

Usually tungsten alloy parts are often used as counterweights for machines, boats, airplanes, yachts, spaceships, and other places that require small size and heavy weight. Tungsten alloys are widely used in high-performance engines (cars, racing cars, motorcycles, trucks) , yachts, etc.).

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Tungsten alloy block can be made into weapon parts, molds and counterweights, such as speedboat counterweights, vehicle counterweights, aircraft counterweights, helicopter counterweights, marine counterweights and tank counterweights, etc.

Dies are mainly used for forming techniques in material processing, including pressing the workpiece with the die, thereby reducing the cross-section and increasing the length. Due to its high melting point and good corrosion resistance, tungsten alloy block is the best raw material for making molds.

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Tungsten alloy medical syringe shield can be used for collimators, nuclear radiation shields, ray blockers, PET syringe shields, protective canisters, radioisotope containers, DNA (FDG) containers, multi-leaf collimators, etc. .

The advantages of tungsten alloy materials:

1.High radiation mask absorption capacity

2.Under the same radiation mask performance, the tungsten alloy mask is thinner than the lead material

3.Non-toxic, environmentally friendly materials

4.Good machinability

5.Hard and wear-resistant, no need for coating protection

6.Easy to disinfect and sterilize

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Tungsten alloy medical syringe shield can be used for collimators, nuclear radiation shields, ray blockers, PET syringe shields, protective canisters, radioisotope containers, DNA (FDG) containers, multi-leaf collimators, etc. .

The advantages of tungsten alloy materials:

1.High radiation mask absorption capacity

2.Under the same radiation mask performance, the tungsten alloy mask is thinner than the lead material

3.Non-toxic, environmentally friendly materials

4.Good machinability

5.Hard and wear-resistant, no need for coating protection

6.Easy to disinfect and sterilize

For more information about tungsten alloy products, please visit: tungsten-alloy.com

Tungsten alloy cube has high density and small volume, and can be used in fields that require small and high specific gravity components. Tungsten alloy cube can be used as golf ball weights, fishing sinkers, military tungsten alloy cube can be used for military weights, missile warheads, armor-piercing warheads, shotgun bullets, prefabricated fragments; it can also be used as a counterweight for oil drilling platforms, and some other High-secret areas, such as mobile phone vibrators, balance of pendulum clocks and automatic watches, shock-proof tool holders, flywheel weights, etc.

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Tungsten alloy (90WMoNiFe) with Anviloy 1150 is made from metal powder refined at a specific high temperature using special high temperature powder metallurgy technology. Such tungsten alloy bar material has low coefficient of thermal expansion, good thermal conductivity and good material properties. Product application

1. Tungsten alloy for die-casting field.

2. Hot riveting bearing material (90WMoNiFe), this material can be used as hot riveting bearing material due to its good comprehensive high temperature performance.

3. Hot stamping valve (90WMoNiFe), this material has both thermal conductivity and high-temperature performance, and maintains good red hardness at 1100℃, as the anvil block for valve stamping; it can significantly improve the service life of the anvil block.

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