Tweco 300 MST Arcmaster - Manual (Page 37)

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5.04 Guide for Selecting Filler Wire Diameter
Filler Wire Diameter AC Current Range
(Amps)
DC Current Range
(Amps)
1/16” (1.6 mm) 30-95 20 - 90
3/32” (2.4 mm) 125-160 65 - 115
1/8” (3.2 mm) 180-240 100 - 165
3/16” (4.8 mm) 220-320 200-350
Table 9 – Filler Wire Selection Guide
NOTE 8
The filler wire diameter specified in the above table is a guide only, other diameter wires may be
used according to the welding application.
5.05 Shielding Gas Selection
Alloy Shielding Gas
Argoshield is a registered trademark of BOC Gases Limited.
Aluminium & alloys Welding Argon, Argoshield 80T, 81T
Carbon Steel Welding Argon
Stainless Steel Welding Argon, Argoshield 71T, 80T, 81T
Nickel Alloy Welding Argon, Argoshield 71T
Copper Welding Argon, Argoshield 81T
Titanium Welding Argon, Argoshield 80T, 81T
Table 10 – Shielding Gas Selection
5.06 TIG Welding Parameters for Low Carbon & Low Alloy Steel Pipe
Electrode Type &
Diameter
Current Range DC
Amperes
Filler Rod for
Root Pass
Joint Preparation
Thoriated 2%
3/32” (2.4 mm)
120 - 170 Yes
Thoriated 2%
3/32” (2.4 mm)
100 - 160 Yes
Thoriated 2%
3/32” (2.4 mm)
90 - 130 No
Table 11 – TIG Welding Parameters for Low Carbon & Low Alloy Steel Pipe