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DYNA TIG 201AC/DC Operating Manual
6.0 BASIC TIG WELDING GUIDE
6.01 Electrode 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.
6.02 Tungsten Electrode Current Ranges
Electrode Diameter (mm)
DC current (A)
AC current (A)
1.0 30—60
30—70
1.6 60—115
60—95
2.4 100—165
125—150
3.2 135—200
130—225
4.0 190—280
190—280
4.8 250—340
250—340
Table 10 Current ranges for varies tungsten electrode sizes
6.03 Tungsten Electrode Types
Tungsten 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
Zirconated 1%
High quality AC welding of aluminium,
magnesium and their alloys.
Self cleaning ,Long life, Maintains
balled end, High current carrying
capacity.
White
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 11 Tungsten e
lectrode
types
