Tweco ArcMaster 401MST - Manual (Page 69)

ARCMASTER 401MST POWER SOURCE
Manual 0-5287 4-13 BASIC WELDING GUIDE
Tungsten Electrode Current Ranges
Electrode Diameter DC Current (Amps)
0.040” (1.0mm) 30-60
1/16” (1.6mm) 60-115
3/32” (2.4mm) 100-165
1/8” (3.2mm) 135-200
5/32” (4.0mm) 190-280
3/16” (4.8mm) 250-340
Table 4-2: Current Ranges for Various Tungsten Electrode Sizes
Guide for Selecting Filler Wire Diameter
Filler Wire Diameter DC Current Range (Amps)
1/16” (1.6mm) 20-90
3/32” (2.4mm) 65-115
1/8” (3.2mm) 100-165
3/16” (4.8mm) 200-350
Table 4-3: Filler Wire Selection Guide
Tungsten Electrode Types
Electrode Type
(Ground Finish)
Welding Application Features Colour Code
Thoriated 2%
DC welding of mild steel,
stainless steel and copper
Excellent arc starting, Long
life, High current carrying
capacity
Red
Zirconated 1%
High quality AC welding of
aluminium, magnesium and
their alloys.
Self cleaning, Long life, Main-
tains balled end, High current
carrying capacity.
White
Ceriated 2%
AC & DC welding of mild
steel, stainless steel, copper,
aluminium, magnesium and
their alloys
Longer life, More stable arc,
Easier starting, Wider cur-
rent range, Narrower more
concentrated arc.
Grey
Table 4-4: Tungsten Electrode Types
TIG Welding Filler Rods
AWS Std Type/Application
ER70S-4
ER70S-6
ER70S-2
For mild-medium strength steels.
Pipes, tubing, roll cages, etc.
ER80S-B2
ER90S-B3
For welding of high strength Cr-Mo
steels used at elevated tempera-
tures.
ER308L
ER309L
ER316L
For stainless steels. Stainless pipes,
tubing, architectural uses, etc.
Table 4-5: TIG Welding Filler Rods