SERVICE MANUAL
TRANSTIG 200 Pi
March 31, 2008
4-13
5. Shielding Gas Selection:
Alloy
Shielding Gas
Aluminium & alloys
Argon
Carbon Steel
Argon
Stainless Steel
Argon
Copper
Argon
Table 4-10: Shielding Gas Selection
6. TIG Welding Parameters for Low Carbon & Low Alloy Steel Pipe:
Electrode Type
& Diameter
Current Range
DC Amperes
Fillet Rod for
Root Pass
Joint
Preparation
Thoriated 2%
3/32'' (2.4mm)
120-170
Yes
Thoriated 2%
3/32'' (2.4mm)
100-160
Yes
Thoriated 2%
3/32'' (2.4mm)
90-130
No
Table 4-11: TIG Welding Parameters for Low Carbon & Low Alloy Steel Pipe
Base Metal
Thickness
DC Current
for Mild
Steel
DC Current
for
Stainless
Steel
Tungsten
Electrode
Diameter
Filler Rod
Diameter (if
required)
Argon Gas
Flow Rate
Liters/min
Joint Type
0.040”
1.0mm
35-45 40-
50
20-30 25-
35
0.040”
1.0mm
1/16”
1.6mm
5-7
Butt/Corner
Lap/ Fillet
0.045”
1.2mm
45-55 50-
60
30-45 35-
50
0.040”
1.0mm
1/16”
1.6mm
5-7
Butt/Corner
Lap/ Fillet
1/16”
1.6mm
60-70 70-
90
40-60 50-
70
1/16”
1.6mm
1/16”
1.6mm
7
Butt/Corner
Lap/ Fillet
1/8”
3.2mm
80-100 90-
115
65-85 90-
110
1/16”
1.6mm
3/32”
2.4mm
7
Butt/Corner
Lap/ Fillet
3/16”
4.8mm
115-135
140-165
100-125
125-150
3/32”
2.4mm
1/8”
3.2mm
10
Butt/Corner
Lap/ Fillet
¼” 6.4mm
160-175
170-200
135-160
160-180
1/8”
3.2mm
5/32”
4.0mm
10
Butt/Corner
Lap/ Fillet
Table 4-12: DC TIG Welding Parameters
NOTE
The information outlined above is for general guidance only. Specific parameters should be used
according to the welding application