Model

Dia(mm)

Length(mm)

Composition

Welding Material

WT10 WT20 WT30 WT40

1.0

150 or 175

ThO2

Carbon steel Stainless steel Copper Aluminum

1.6

150 or 175

2.0

150 or 175

2.4

150 or 175

3.0

150 or 175

3.2

150 or 175

4.0

150 or 175

5.0

150 or 175

6.0

150 or 175

8.0

150 or 175

10.0

150 or 175

12.0

150 or 175

Trade mark 

Added
impurity 

Impurity
quantity 

Other
impurities 

Tungsten 

Electric
discharged
power 

Color
sign 

WC20

CeO2

1.80 - 2.20%

<0.20%

The rest

2.7 - 2.8

Grey

Trade mark

Added
impurity

Impurity
quantity

Other
impurities

Tungsten

Electric
discharged
power

Color
sign

WL10

La2O3

0.80 - 1.20%

<0.20%

The rest

2.6 - 2.7

Black

WL15

La2O3

1.30 - 1.70%

<0.20%

The rest

2.8 - 3.0

Yellow

WL20

La2O3

1.80 - 2.20%

<0.20%

The rest

2.8 - 3.2

Sky blue

Trade mark

Added
impurity

Impurity quantity

Other
impurities

Tungsten

Electric
discharged
power

Color sign

WZ3

ZrO2

0.20 - 0.40%

<0.20%

The rest

2.5 - 3.0

Brown

WZ8

ZrO2

0.70 - 0.90%

<0.20%

The rest

2.5 - 3.0

White

Trade mark

ThO2 Content(%)

Color sign

WT10

0.90 - 1.20

Primary

WT20

1.80 - 2.20

Red

WT30

2.80 - 3.20

Purple

WT40

3.80 - 4.20

Orange Primary

Electrode Name

Trade 
mark

Added impurity

Impurity quantity

Other impurities

Tungsten

Electric discharged power

Color sign

Pure Tungsten Electrode

WP

--

--

<0.20%

The rest

4.5

Green

Yttrium-Tungsten Electrode

WY20

YO2

1.80 - 2.20%

<0.20%

The rest

2.0 - 3.9

Blue

Composite Electrode

WRex

ReOx

1.00 - 4.00%

<0.20%

The rest

2.45 - 3.1