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7.0 BASIC TIG WELDING GUIDE
7.01Electrode Polarity
Connect the TIG torch to the - /
TORCH
terminal and the work lead to the
+ / WORK
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.
7.02 Tungsten Electrode Current Ranges
Electrode Diameter
DC Current (Amps)
0.040” (1.0mm)
30 – 60
1/16” (1.6mm)
60 – 115
3/32” (2.4mm)
100 – 165
1/8” (3.2mm)
135 – 200
5/32” (4.0mm)
190 – 280
3/16” (4.8mm)
250 – 340
Table 7 – Current ranges for varies tungsten electrode sizes
7.03 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%
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
Table 8 – Tungsten electrode types
Summary of Contents for 250TS DC CC
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