Miller CST 280 VRD International Manuale d'uso - Pagina 36
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SECTION 7 − SELECTING AND PREPARING TUNGSTEN
NOTE
7-1. Selecting Tungsten Electrode
Electrode Diameter
Negative/Straight Polarity
2% Thorium Alloyed
Tungsten (Red Band)
.010"
.020"
.040"
1/16"
3/32"
1/8"
5/32"
3/16"
1/4"
♦
Typical argon shielding gas flow rates are 15 to 35 cfh (cubic feet per hour).
*Not Recommended.
The figures listed are intended as a guide and are a composite of recommendations from American Welding Society (AWS) and electrode
manufacturers.
7-2. Safety Information About Tungsten
OM-217 655 Page 32
ELECTRODE
For additional information, see your distributor for a handbook on the Gas
Tungsten Arc Welding (GTAW) process.Wear clean gloves to prevent
contamination of tungsten electrode.
DC − Argon − Electrode
DC − Argon − Electrode
Positive/Reverse Polarity
Up to 25
15-40
25-85
50-160
135-235
250-400
400-500
500-750
750-1000
1
2
♦
Amperage Range - Gas Type
AC − Argon − Using
High Frequency
*
*
*
10-20
15-30
25-40
40-55
55-80
80-125
- Polarity
AC − Argon − Balanced
Wave Using High Freq.
Up to 20
Up to 15
15-35
5-20
20-80
20-60
50-150
60-120
130-250
100-180
225-360
160-250
300-450
200-320
400-500
290-390
600-800
340-525
Y Grinding the tungsten elec-
trode produces dust and fly-
ing sparks which can cause
injury and start fires. Use lo-
cal exhaust (forced ventila-
tion) at the grinder or wear an
approved respirator. Read
MSDS for safety information.
Consider using tungsten
containing ceria, lanthana,
or yttria instead of thoria.
Grinding dust from thoriated
electrodes contains low-lev-
el
radioactive
Properly dispose of grinder
dust in an environmentally
safe way. Wear proper face,
hand, and body protection.
Keep flammables away.
1
Tungsten Electrode With
Balled End
2
Pointed Tungsten Electrode
gtaw 7/97
material.
Ref. S-0161