GB/T 31908-2015Tungsten electrodes for arc welding and plasma welding and cutting (English PDF)

3.1 Product classification and identification

3.1.1 Supply status classification

Tungsten electrodes as supplied state can be divided into light and dark bar rod. rod is the use of grinding, polishing and other surface treatment, the surface is metallic luster; the black pole

After the plastic processing is not subjected to surface treatment, the surface oxide layer or a graphite drawing milk and so on.

3.1.2 Classification by chemical composition

Tungsten Grades by chemical composition into WP, WC20, WT10, WT20, WT30, WT40, WZ3, WZ8, WL10,

WL15, WL20, WY20, WX10, WX20, WX30, WX40 total of 16 grades.

Grades that way. The first letter indicates the main elements of tungsten, tungsten electrodes marked with the symbol for uppercase W; second letter indicates

Doped oxide type, usually marked with the symbol doping element name initials, pure tungsten electrode free of other additives, compared with P,

Multiple composite rare earth tungsten electrode more rare earth oxides of X; symbol numbers indicate the nominal content of tungsten electrodes doped oxides

One thousand score.

It represents a major element tungsten tungsten electrode, marked with the symbol uppercase W

Letters doped oxide type, usually marked with the symbol doping element name initials, pure tungsten

Electrode without other additives, compared with P, multiple composite rare earth tungsten electrode more rare earth oxides of X

××

Digital content on behalf of an oxide doped tungsten electrode thousand scores

Example.

Cerium tungsten electrodes WC20. Wherein W --- representatives of the main content of tungsten; C --- rare earth-doped cerium; 20 --- doping amount of rare earth oxide is about 20 per thousand.