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Product Name: Pure Tungsten Electrode
AWS Specification: AWS A5.12
AWS Classification: EWP
Color Code: Green

Description: Pure Tungsten (EWP) electrodes are unalloyed tungsten electrodes (99.5% tungsten minimum). Their current-carrying capacity is lower than that of other electrodes. They provide good stability when used with alternating current, either balanced wave or continuously high frequency stabilized. They may be used with direct current and also with either argon or helium, or a combination of both, as a shielding gas. They maintain a clean, balled end, which is preferred for aluminum and magnesium welding.

These electrodes have reasonably good resistance to contamination of the weld metal by the electrode, although the oxide containing electrodes are superior in this respect. Pure tungsten electrodes are generally used on less critical applications, except for welding aluminum and magnesium. The lower cost pure tungsten electrodes can be used for less critical applications where some tungsten contamination of welds is acceptable.

Chemical compositions (% in wt.)
Tungsten (W): 99.5 min.      Total others: 0.5 max.

Available sizes: 1.0mm (.040"), 1.6mm (1/16"), 2.4mm (3/32"), 3.2mm (1/8"), 6.4mm (1/4")
Product Name: 2% Ceriated Tungsten Electrode
AWS Specification: AWS A5.12
AWS Classification: EWCe-2
Color Code: Grey

Description: EWCe-2 (2% Ceriated) electrode is tungsten electrode containing about 2% cerium oxide, referred to as ceria. The EWCe-2 electrode was first introduced into the US market in 1987. Several other grades of this type of electrode are commercially practical, including electrodes containing 1% ceria, but only one grade, EWCe-2, has been incorporated in this specification as having commercial significance. The advantages of tungsten electrodes containing ceria, compared to pure tungsten, include increased ease of starting, improved arc stability, and reduced rate of vaporization or burn-off. Unlike thoria, ceria is not a radioactive material. These advantages increase with increased ceria content. These electrodes operate successfully with AC or DC, either polarity.

Chemical compositions (% in wt.)
Tungsten (W): Bal.    CeO2: 1.8-2.2    Total others: 0.2 max.

Available sizes: 1.0mm (.040"), 1.6mm (1/16"), 2.4mm (3/32"), 3.2mm (1/8"), 6.4mm (1/4")
Product Name: Thoriated Tungsten Electrode

AWS Specification: AWS A5.12
AWS Classification: EWTh
Color Code:

Description: Thoriated tungsten electrodes are the electrode of tungsten containing 1-4% of ThO2. The power of its electronic transgression is 2.7 ev, about 40% less than that of pure tungsten electrode. With a low arc derivation voltage, it’s easy to cause arc with high stability. Its current capacity is elevated 30% while its rate of burn spoilage drops low, making it more durable. Thoriated tungsten electrode is widely applied in direct current welding.

Chemical compositions (% in wt.)

Classification

Additive

Additive quantity %

Total others %

Tungsten %

Color Code

EWTh-1

ThO2

09-1.2

0.2 max.

Bal.

Yellow

EWTh-2

ThO2

1.8-2.2

0.2 max.

Bal.

Red

EWTh-3

ThO2

2.8-3.2

0.2 max.

Bal.

Purple

EWTh-4

ThO2

3.8-4.3

0.2 max.

Bal.

Orange

Available sizes: 1.0mm (.040"), 1.6mm (1/16"), 2.4mm (3/32"), 3.2mm (1/8"), 6.4mm (1/4")

Product Name: Lanthanated Tungsten Electrodes

AWS Specification: AWS A5.12
AWS Classification: EWLa
Color Code:

Description: Lanthanated Tungsten Electrode became very popular in the industry of welding in the world soon after it was developed because of its good welding performance. The electric conductivity of Lanthanated Tungsten electrode is most closed to that of 2%Thoriated Tungsten. Welders can easily replace Thoriated Tungsten Electrode with Lanthanated Tungsten Electrode at either AC or DC and do not have to make any welding program changes. The radioactivity from Thoriated Tungsten can thus be avoided.

Chemical compositions (% in wt.)

Classification

Additive

Additive quantity %

Total others %

Tungsten %

Color Code

EWLa-1

La2O3

0.8-1.2

0.2 max.

Bal.

Black

EWLa-1.5

La2O3

1.3-1.7

0.2 max.

Bal.

Gold

EWLa-2

La2O3

1.8-2.2

0.2 max.

Bal.

Sky Blue

Available sizes: 1.0mm (.040"), 1.6mm (1/16"), 2.4mm (3/32"), 3.2mm (1/8"), 6.4mm (1/4")

Product Name: Yttrium Tungsten Electrode
AWS Specification: AWS A5.12
AWS Classification: EWY-2
Color Code:

Description: Thoriated tungsten electrodes have been designed for direct current applications. They have the thoria contents dispersed evenly throughout their entire length. They maintain a sharpened point well, which is desirable for welding steel. They can be used on alternating current work, but a satisfactory balled end, which is desirable for the welding of nonferrous metals, is difficult to maintain. Should it be desired to use these electrodes for alternating current welding, then balling can be accomplished by briefly, and carefully, welding with direct current electrode positive prior to welding with alternating current. During alternating current welding, the balled end does not melt and so emission is not as good as from a liquid ball on a pure tungsten (EWP) electrode.

Available sizes: 1.0mm (.040"), 1.6mm (1/16"), 2.4mm (3/32"), 3.2mm (1/8"), 6.4mm (1/4")