04 gtaw electrode polarity, 05 guide for selecting filler wire, 06 tungsten electrode current ranges – Tweco 95 S Thermal Arc(Jan2013) User Manual
Page 29: 07 shielding gas selection, 08 tungsten electrode types, 09 tig welding parameters for steel, Gtaw electrode polarity -3, Guide for selecting filler wire -3, Tungsten electrode current ranges -3, Shielding gas selection -3
OPERATION
THERMAL ARC 95 S
Operation 4-3
Manual 0-5086
4.08 Tungsten Electrode Types
Electrode Type
(Ground Finish)
Welding Application
Features
Color 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, aluminum, magnesium and
their alloys.
Longer life, more stable arc, easier
starting, wider current range,
narrower & more concentrated arc.
Grey
4.09 TIG Welding Parameters for Steel
Base Metal
Thickness
DC Current
Electrode
Diameter
Filler Rod
Diameter
Argon Gas Flow
Rate
Joint / Type
Mild Steel Stainless
Steel
0.040"
(1.0mm)
35-45
20-30
0.040"
(1.0mm)
1/16"
(1.6mm)
10 CFH
(5 LPM)
Butt/Corner
40-50
25-35
Lap/Filler
0.045"
(1.22mm)
45-55
30-45
0.040"
(1.0mm)
1/16"
(1.6mm)
13 CFH
(6 LPM)
Butt/Corner
50-60
35-50
Lap/Filler
1/16"
(1.6mm)
60-70
40-60
1/16"
(1.6mm)
1/16"
(1.6mm)
15 CFH
(7 LPM)
Butt/Corner
70-90
50-70
Lap/Filler
1/8"
(3.2mm)
80-100
65-85
1/16" (1.16mm) 3/32" (2.4mm)
15CFH
(7 LPM)
Butt/Corner
90-115
90-110
Lap/Filler
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
Filler Wire Diameter
DC Current (Amps)
1/16" (1.6mm)
20 - 90
3/32" (2.4mm)
60 - 115
4.06 Tungsten Electrode Current Ranges
Electrode Diameter
DC Current
.040" (1.0mm)
20 - 90
1/16" (1.6mm)
60 - 115
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