Tungsten Electrode

What is Electrode?

An electrode is an electrical conductor used to make contact with a nonmetallic part of a circuit (e.g. a semiconductor, an electrolyte or a vacuum). The word was coined by the scientist Michael Faraday from the Greek words elektron (meaning amber, from which the word electricity is derived) and hodos, a way.

pure tungsten electrode image thorium tungsten electrode picture

Pure Tungsten Electrode

Thorium Tungsten Electrode

lanthanum tungsten electrode image cerium tungsten electrode picture

Lanthanum Tungsten Electrode

Cerium Tungsten Electrode

zirconium tungsten electrode image

Zirconium Tungsten Electrode

 

Tungsten Electrode for TIG welding:

Tungsten electrodes are used when arc welding with the Tungsten Inert gas (TIG) process or when plasma welding. In both processes the electrode, arc and weld pool are protected from atmospheric contamination by an inert gas. A tungsten electrode is used because it can withstand very high temperatures with minimal melting or erosion. Tungsten electrodes are made by powder metallurgy and are formed to size after sintering.

TIG welding tungsten electrodes usually contain small quantities of other metallic oxides which can offer the following benefits:-

  • facilitate arc starting
  • increase arc stability
  • improve current-carrying capacity of the rod.
  • reduce the risk of weld contamination
  • increase electrode life

Oxides used are primarily those of zirconium, thorium, lanthanum, yttrium or cerium. Additions are usually of order 1%-4%. All these oxides greatly improve arc initiation, especially when direct current (DC) welding is employed. Thorium oxide (thoria) has been used for many years having been found effective in terms of long life and thermal efficiency. Zirconium oxide (zirconia) has been commonly used for alternating current (AC) TIG welding, normally for welding aluminium.

Type

Brand

Color

Chemical Composition(%)

Sizes

(mm)

Surface

Features

Rare Earth

Impurities

W

Pure

Tungsten

WP

Green

≤0.05

the rest

0.8~15

D,E

G,S

Non-radioactive;suitable for AC welding of aluminum, magnesium, and their alloy

Thoriated

Tungsten

WTh10

Yellow

0.9~1.1ThO2

≤0.05

the rest

0.8~15

D,E

G,S

Excellent electron emission and overall performances; high current-carrying capacity; radioactivity; suitable for DC welding of carbon steel, stainless steel,nickel alloy and titanium alloy.

WTh20

Red

1.8~2.2ThO2

≤0.05

the rest

0.8~15

Lanthanum

Tungsten

WLa10

Black

0.8~1.2La2O3

≤0.05

the rest

0.8~15

D,E

G,S

Non-radioactive;excellent electric conductivity and welding capacity; high current-carrying capacity; minimum ratio of burnt area; substitute for thoriated tungsten electrode; mainly used in DC welding.

WLa15

Golden

Yellow

1.3~1.7 La2O3

≤0.05

the rest

0.8~15

WLa20

Blue

1.8~2.2 La2O3

≤0.05

the rest

0.8~15

Cerium

Tungsten

WCe10

Pink

0.8~1.2CeO2

≤0.05

the rest

0.8~15

D,E

G,S

Non-radioactive;easier arc initiation under low current circumstances, and low arc-maintaining current;suitable for the welding of pipelines,small components and discontinuous welding.

WCe15

Orange

1.3~1.7CeO2

≤0.05

the rest

0.8~15

WCe20

Grey

1.8~2.2CeO2

≤0.05

the rest

0.8~15

Yttrium

Tungsten

WY20

Sky

Blue

1.8~2.2Y2O3

≤0.05

the rest

0.8~15

D,E

G,S

Non-radioactive;long and slim arc beam with high compression; deeper burning groove under medium and high current circumstances.

Compound

Rare Earth

Tungsten

WMX

Cyan

1.0~5.0MOx

≤0.05

the rest

0.8~15

D,E

G,S

Compound rare-earth tungsten electrode; different additives contributing to better performance of tungsten electrode

Note:D—As Drawn     E—Electrolytic Polished    G—Ground      S—Swaged

If there is any interest in pure tungsten products, please feel free to contact us through the following methods.
Email: sales@chinatungsten.com
Tel.: +86 592 512 9696/+86 592 512 9595/+86 592 512 7878
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1.How to Order Tungsten Electrode