Practical tips for welding: tungsten electrodes

All about the welding accessories TIG welding electrodes

Last updated on: February 26, 2026

Finely crafted weld seams, clean welded joints, high-quality materials – welcome to the world of TIG welding and tungsten electrodes. Choosing the right tungsten electrode is just as important for TIG welding as the contact tip for MAG welding. The range of TIG welding electrodes on the market is just as colourful as the colour coding that characterizes each individual type of tungsten electrode. In this blog post we would like to give you a helpful overview of the essential tungsten electrodes to make it easier for you to choose if you want to buy them.

Tungsten electrodes and their doping

Tungsten is the main component of TIG welding electrodes, but apart from the pure tungsten electrode (WP green), all others are enriched with further elements, which is known as doping. This is also called tungsten doping. The additional elements give the electrodes their very specific properties to optimize the welding process. These are described in more detail below.

But which tungsten electrode is the right one for my welding process?

The selection of the right tungsten electrode or its doping depends largely on the welding task: whether you want to weld direct current or alternating current, the choice of electrodes is limited, because not every type is also suitable for alternating current, which for example is used for aluminum welding. Depending on the type of current, the welding task and the material to be welded, pure tungsten electrodes are used or those with oxidic additives, usually consisting of rare earths. These additives are zirconium oxide (ZrO₂), lanthanum oxide (La₂O₃), cerium oxide (CeO₂) or thorium oxide (ThO₂) – and they all have different properties.

The doping elements and their effect:

• Compared to pure tungsten electrodes, zirconium oxide keeps the evaporation lower and enables a more stable arc.
• Lanthanum oxide has particularly good ignition properties and gives the electrodes a longer service life.
• Cerium oxide gives a tungsten electrode very good ignition and reignition properties.
• Thorium oxide creates a very stable arc, but due to its radioactivity it is very harmful to health and as an additive to tungsten electrodes is now banned in many countries. Once thorium smoke or dust is inhaled, it can be deposited in the lungs and lead to internal radiation exposure.

The pure tungsten electrode (WP green) enables a very steady arc. Oxide-containing electrodes, on the other hand, are easier to ignite, have a high current carrying capacity and a longer service life.

So it is obvious that the choice of the right TIG welding electrode for a welding task largely depends on what you focus on in TIG welding.

The tungsten electrode table shown below gives you an overview of the most common types and their suitability and properties. Do you mainly weld high-alloy steels or aluminum? Is the service life of the electrode more important to you or its ignitability? With this table you can make your pre-selection much easier.

Table tungsten electrode selection

A glance at the table clearly shows two types of tungsten electrodes that can be used universally. Learn more about them below.

Tungsten electrode colours and their application

E3^® PRO

• The best of the best and a further development of the proven E3^® from ABICOR BINZEL
• Special composition of rare earth oxides, resulting in a particularly fine and homogeneous structure thanks to a newly developed manufacturing process
• Suitable for all applications and materials
• Even better ignition properties compared to the E3^® – especially in the low amperage range – and even longer service life
• Suitable for direct and alternating current
• For manual and automated welding
• Completely non-toxic to humans and the environment

Color coding with a mixture of rare earth oxides is:
Purple & gold = E3^® PRO

E3^®

• Mixture of rare earth oxides
• Suitable for virtually all metals
• Excellent ignition properties
• Consistently low electrode temperature, longer service life than thoriated TIG electrodes
• For manual and automated welding
• Non-toxic to humans and the environment

Colour coding with a mixture of rare earth oxides is:

Purple = E3^®

WLa

• Tungsten electrode with lanthanum oxide as a dopant
• Can be used for both DC and AC welding
• Primarily used for welding unalloyed and high-alloy steels, aluminum, titanium, copper, and magnesium alloys, as well as in micro-plasma welding

Colour codings with lanthanum oxide are:

Gold = WLa 15 – with 1.30 to 1.70 % lanthanum oxide

Black = WLa 10 – with 0.80 to 1.20 % lanthanum oxide

Blue = WLa 20 – with 1.70 to 2.20 % lanthanum oxide

WCe

• Due to its cerium oxide content, it has a higher tensile strength than a TIG electrode with pure tungsten – however, less than E3^® and lanthanum electrodes
• Primarily used in the medium and lower current ranges for welding unalloyed and high-alloy steels, as well as aluminum, copper, nickel, titanium, and magnesium alloys
• Suitable for both DC and AC welding, but less effective than E3^® electrodes

Colour coding with cerium oxide is:

Grey = WCe 20 – with 1.80 to 2.20 % cerium oxide

WP

• Made of pure tungsten
• Used exclusively in AC welding
• Ideal electrode for welding aluminum alloys, as its melting point of 3,422 °C is ideally suited for AC welding
• Tungsten also has high resistance and very high corrosion resistance

Colour coding with pure tungsten is:

Green = W – made of pure tungsten without any oxide component

WZr

• The addition of zirconium oxide reduces the risk of contaminating the weld pool
• Primarily used for AC welding, only conditionally suitable for DC welding
• Zirconium oxide ensures a very stable weld pool during AC welding
• Ignition is rather poor during DC welding

Colour codings with zirconium oxide are:

Brown = WZr 03 – with 0.15 to 0.50 % zirconium oxide

White = WZr 08 – with 0.70 to 0.90 % zirconium oxide

Tip:

The WZr and the pure tungsten electrode should only be used with the old single-phase TIG power sources.

Hands off tungsten electrodes with thorium!

TIG welding electrodes with thorium oxide as a doping element are extremely harmful to health due to their radioactive properties and are now banned in several countries. The German statutory accident insurance »DGUV« information 208-049 refers to the fact that thorium oxide-containing tungsten electrodes according to Section 4.2 (1) of TRGS 528 “may only be used for product-specific requirements (compelling technical reasons)” and that the provisions of the Radiation Protection Ordinance must be observed. For companies, the use of thorium-containing TIG electrodes is subject to strict regulations. It's best to keep your hands off tungsten electrodes with thorium!

When does a hazard arise when using a thorium-containing tungsten electrode?

Thorium-containing tungsten electrodes pose a hazard even during grinding. When grinding a TIG electrode containing thorium, extraction with dust collectors of dust class H must be used. Filters of this classification can separate highly hazardous dusts, such as substances that are hazardous to health. The same applies to welding with thorium-containing tungsten electrodes.

How can you distinguish a tungsten electrode with thorium from an E3^® or E3^® PRO?

Tungsten electrodes with thorium are color-coded red. E3^® electrodes are color-coded purple, and E3^® PRO electrodes are color-coded purple and gold.

General protective measures for TIG welding

According to DGUV* (German statutory accident insurance) regulations, the risk to employees from welding fumes must be reduced according to the state of the art (compliance with dust limits). Hazardous substances should be captured at their source – using so-called extraction at the source – if it is not possible to replace TIG welding with another emission-free joining process. The reason: The hazardous substances must not enter the respiratory tract of the welder or people working in the vicinity. When selecting the extraction system, it must be taken into account that the fume extraction elements are positioned close enough to the welds. Care must be taken to ensure that the extraction airflow does not affect the shielding gas coverage during the extraction process.

Is there a type of TIG welding electrode that can be used for any welding task?

Yes, there is: E3^® PRO (purple & gold) and E3^® (purple). Both tungsten electrodes are a long-lasting TIG welding electrodes that guarantee best results. It is not only a better alternative to other electrodes for the welder and his health, but also for the environment. Grinding dust, filter dust and leftover pieces are not hazardous waste, and transport and storage do not require any special protective measures because the E3^® PRO as well as the E3^® welding electrodes are absolutely free of radioactive components.

E3^® PRO and E3^® tungsten electrodes comply with the EN ISO 6848 standard and, like all TIG welding electrodes from the ABICOR BINZEL product portfolio, are manufactured in our own production network and are characterized by the highest product quality. Each packaging of the E3^® as well as the E3^® PRO tungsten electrodes has a batch number, which guarantees traceability if necessary. Upon request, you can also receive a production certificate and a safety data sheet. Please feel free to contact us.

The advantages of the E3^® PRO and E3^® welding electrodes at a glance:

• »Cool« electrode tip
• Excellent ignition and re-ignition properties
• High arc stability
• Low burn-off
• High current carrying capacity
• Little deformation of the electrode tip
• The E3^® PRO is suitable for all welding tasks

Finally, a question about application:

How far should a tungsten electrode protrude from the gas nozzle? Is there a general rule?

There is no general rule. Some users say as far as the electrode is ground. We say: It depends on the specific application. When welding a fillet weld, the TIG electrode needs to protrude further from the gas nozzle than when welding a butt weld. The electrode stickout is also adjusted to the size and diameter of the gas nozzle. With a small gas nozzle, the tungsten electrode doesn't need to protrude as far as with a large gas nozzle with a large diameter.

If you want to be on the safe side when choosing your welding electrode for TIG welding and the quality of the weld seam is important to you, you should definitely test the E3^® PRO and E3^® tungsten electrode from ABICOR BINZEL. Have you already welded with one of these TIG electrodes? Then you are welcome to share your experiences with us.

Happy welding!

*Form FBHM-135 »functional area AKTUELL (current activities)«, Hazards from hazardous substances in tungsten inert gas (TIG) welding – Prevention measures, as per: 21.07.2023