Tweco 201 ts Thermal Arc - Manual (Page 36)

THERMAL ARC 161 STL, 201 TS OPERATION
Operation 4-6 Manual 0-5203
4.05 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.
4.06 Guide for Selecting Filler Wire
Filler Wire Diameter DC Current (Amps)
1/16" (1.6mm) 20 - 90
3/32" (2.4mm) 65 - 115
1/8" (3.2mm) 100 - 165
4.07 Tungsten Electrode Current Ranges
Electrode Diameter DC Current
.040” (1.0mm) 25 - 85
1/16” (1.6mm) 50 - 160
3/32” (2.4mm) 135 - 235
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, aluminum, magnesium and
their alloys.
Longer life, more stable arc, easier
starting, wider current range,
narrower & more concentrated arc.
Grey