Tweco 175 SE Arc Master - Manuel (Page 29)

OpERATION ARC MASTER 175 SE
Manual 0-5054 4-3 OPERATION
4.04 GTAW Electrode Polarity
Connect the TIG torch to the "-" Negative Output
Terminal and the work lead to the "+" Positive Output
Terminal for direct current straight polarity. Direct
current straight polarity is the most widely used
polarity for DC TIG welding. It allows limited wear of
the electrode since 70% of the heat is concentrated
at the work piece.
4.05 Guide for Selecting Filler Wire
Electrode Diameter DC Current
.040” (1.0mm) 30 - 60
1/16” (1.6mm) 60 - 115
3/32” (2.4mm) 100 - 165
1/8” (3.2mm) 135 - 175
4.06 Tungsten Electrode Current
Ranges
Electrode Diameter DC Current
.040” (1.0mm) 25 - 85
1/16” (1.6mm) 50 - 160
4.07 Shielding Gas Selection
Alloy Shielding Gas
Carbon Steel Welding Argon
Stainless Steel Welding Argon
Nickel Alloy Welding Argon
Copper Welding Argon
Titanium Welding Argon
4.08 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
Ceriated 2% AC & DC welding of mild steel,
stainless steel, copper aluminium
magnesium and their alloys.
Longer life, more stable arc,
easier starting, wilder current
range, narrower more concen-
trated arc.
Grey
4.09 TIG Welding Parameters for Steel
Joint
Mild Steel Stainless Steel Type
0.040” 35-45 20-30 1/16” 10 CFH Butt/Corner
(1.0mm) 40-50 25-35 (1.6mm) (5 LPM) Lap/ Fillet
0.045” 45-55 30-45 1/16” 13 CFH Butt/Corner
(1.2mm) 50-60 35-50 (1.6mm) (6 LPM) Lap/ Fillet
1/16” 60-70 40-60 1/16” 15 CFH Butt/Corner
(1.6mm) 70-90 50-70 (1.6mm) (7 LPM) Lap/ Fillet
1/8” 80-100 65-85 3/32” 15 CFH Butt/Corner
(3.2mm) 90-115 90-110 (2.4mm) (7 LPM) Lap/ Fillet
3/16” 115-135 100-125 1/8” 21 CFH Butt/Corner
4.8mm 140-165 125-150 (3.2mm) (10 LPM) Lap/ Fillet
¼” 160-175 135-160 1/8” 5/32” 21 CFH Butt/Corner
(6.4mm) 170-200 160-180 (3.2mm) (4.0mm) (10 LPM) Lap/ Fillet
Base Metal
Thickness
DC Current
Electrode
Diameter
Filler Rod
Diameter
1/16”
(1.6mm)
3/32”
(2.4mm)
Argon Gas
Flow Rate
0.040”
(1.0mm)
0.040”
(1.0mm)
1/16”
(1.6mm)