Miller CST 282 Owner's Manual - Page 36

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SECTION 9 – SELECTING AND PREPARING A TUNGSTEN

FOR DC OR AC WELDING WITH INVERTER MACHINES

9-1.

Selecting Tungsten Electrode

Whenever possible and practical, use DC weld output instead of AC weld output.

NOTICE – Wear clean gloves to prevent contamination of tungsten.

A. Select Tungsten Electrode

Electrode Diameter

(2% Ceriated, 1.5% Lanthanum, Or 2%

Thorium Alloy Tungstens)

0.010 in. (0.25 mm)

0.020 in. (0.50 mm)

0.040 in. (1 mm)

1/16 in. (1.6 mm)

3/32 in. (2.4 mm)

1/8 in. (3.2 mm)

5/32 in. (4.0 mm)

3/16 in. (4.8 mm)

1/4 in. (6.4 mm)

*Typical argon shielding gas flow rates are 10 to 25 CFH (cubic feet per hour).

Figures listed are a guide and are a composite of recommendations from American Welding Society (AWS).

B. Electrode Composition

Tungsten Type

2% Cerium (Gray)

1.5–2% Lanthanum (Yellow/Blue)

2% Thorium (Red)

Pure Tungsten (Green)

�

Not all tungsten electrode manufacturers use the same colors to identify tungsten type. Contact the tungsten electrode manufacturer or

reference the product packaging to identify the tungsten you are using.

OM-285986 Page 30

Amperage Range By Gas Type* And Polarity

DCEN – Argon

Direct Current Electrode Negative

(For Use With Mild Or Stainless Steel)

Up to 15

5–20

15–80

70–150

150–200

250–400

400–500

500–750

750–1000

Application Notes

Good all-around tungsten for both AC and DC welding.

Excellent low amp starts for AC and DC welding.

Commonly used for DC welding, not ideal for AC.

Not recommended for inverters!

For best results in most applications, use a sharpened cerium or lanthanum electrode for AC

or DC welding.

AC – Argon

Unbalanced Wave

(For Use With Aluminum)

Up to 15

5–20

15–80

70–150

140–235

225–325

300–400

400–500

500–630