The color of tungsten electrodes
According to standards EN 26848 all tungsten electrodes should have an alphanumeric designation. They are also identified by color. First letter W indicates tungsten, the second means is an oxide of a chemical element that is part of the.
For example, 20 suggests that the composition of the electrode alloy oxide 2%. Sometimes referred to another number after a percentage of additives. It indicates the length of the tungsten electrode (in mm). Standard electrodes have a length of 50, 75, 150, and 175 mm.
|blue||WL 20||2% La2O3|
|black||WL 10||1% La2O3|
|yellow||WT 10||1% thorium oxide|
|purple||WT 30||3% thorium oxide|
|red||WT 20||2% ThO2|
|orange||WT 40||4% ThO2|
|gold||WL 15||A 1.5% La2O3|
|grey||WC 20||2% Ce2O3|
|white||WZ 8||0.8% of ZrO2|
Additive to tungsten
|Mark||Additives||The purpose of alloying|
|VM||Si + Th||The growth temperature of recrystalization, increases the strength.|
|W||ThO2||The increase in the emission properties of tungsten|
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