Miller A-250 Series Instrukcja obsługi - Strona 13
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SECTION 6 −
FOR DC OR AC WELDING WITH INVERTER MACHINES
Whenever possible and practical, use DC weld output instead of AC weld output.
6-1. Selecting Tungsten Electrode (
A. Select Tungsten Electrode.
.
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.
Electrode Diameter
.010 in. (.25 mm)
.020 in. (.50 mm)
.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
Application Notes
2% Cerium
Good all−around tungsten for both AC and DC welding.
(Grey *)
1.5−2% Lanthanum
Excellent low amp starts for AC and DC welding.
(Yellow/Blue)
2% Thorium
Commonly used for DC welding, not ideal for AC.
(Red)
Pure Tungsten
Not Recommended for inverters!
For best results in most applications use a sharpened cerium or lanthanum electrode for AC and DC welding.
(Green)
* Color may vary depending on manufacturer, please refer to manufacturer's guide for color designation.
SELECTING AND PREPARING A TUNGSTEN
Wear Clean Gloves To Prevent Contamination Of Tungsten
(DCEN) − Argon
Direct Current Electrode Negative
(For Use With Mild Or Stainless Steel)
2% Ceriated, 1.5% Lanthanum, Or 2% Thorium Alloy Tungstens
Up to 15
5-20
15-80
70-150
150-250
250-400
400-500
500-750
750-1000
♦
Amperage Range - Gas Type
gtaw_Inverter_2018-01
- Polarity
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
OM-282751 Page 9
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