Tweco 201 ts Thermal Arc - Manual (Page 31)

OPERATION THERMAL ARC 201 Ts
Manual 0-5149 4-5 Operation
4.08 Shielding Gas Selection
Alloy Shielding Gas
Carbon Steel Welding Argon
Stainless Steel Welding Argon
Nickel Alloy Welding Argon
Copper Welding Argon
Titanium Welding Argon
4.09 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, aluminium, magnesium and
their alloys.
Longer life, more stable arc, easier
starting, wider current range,
narrower & more concentrated arc.
Grey
4.10 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
1.0mm
(0.040")
35-45 20-30
1.0mm
(0.040")
1.6mm
(1/16" )
10 CFH
(5 LPM)
Butt/Corner
40-50 25-35 Lap/Filler
1.2mm
(0.045")
45-55 30-45
1.0mm
(0.040")
1.6mm
(1/16")
13 CFH
(6 LPM)
Butt/Corner
50-60 35-50 Lap/Filler
1.6mm
(1/16")
60-70 40-60
1.6mm
(1/16")
1.6mm
(1/16")
15 CFH
(7 LPM)
Butt/Corner
70-90 50-70 Lap/Filler
3.2mm
(1/8")
80-100 65-85
1.6mm
(1/16")
2.4mm
(3/32")
15CFH
(7 LPM)
Butt/Corner
90-115 90-110 Lap/Filler
4.8mm
(3/16")
115-135 100-125
2.4mm
(3/32")
3.2mm
(1/8")
21CFH
(10 LPM)
Butt/Corner
140-165 125-150 Lap/Filler
6.4mm
(1/4")
160-175 135-160
3.2mm
(1/8")
4.0mm
(5/32")
21CFH
(10 LPM)
Butt/Corner
170-200 160-180 Lap/Filler
4.11 Arc Welding Practice
The techniques used for arc welding are almost identical regardless of what types of metals are being joined.
Naturally enough, different types of electrodes would be used for different metals as described in the preceding
section.