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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
6.03
Tungsten Electrode Types
Tungsten type
(Ground finish)
DC welding of mild steel, stainless
Thoriated 2%
steel and copper
DC welding of mild steel, stainless
Ceriated 2%
steel, copper, aluminium, magnesium
and their alloys
6.04
Guide for Selecting Filler Wire Diameter
Notice£º
The filler wire diameter specified in Table 9 is a guide only, other diameter wires may be used
according to the welding application.
BOSS ARC 140¡¢ 160 Operating Manual
Electrode Diameter (mm)
1.0
1.6
2.4
3.2
4.0
4.8
Table 7 Current ranges for varies tungsten electrode sizes
Welding Application
Table 8 Tungsten electrode types
Filler wire diameter
1.6
2.4
3.2
4.8
Table 9 Filler wire selection guide
DC current (A)
30— 60
60— 115
100— 165
135— 200
190— 280
250— 340
Features
Excellent arc starting, Long life, high
current carrying capacity
Longer Life, More stable arc, Easier
starting,
Wider
Narrower more concentrated arc
DC current range (Amps)
20— 90
65— 115
100— 165
200— 350
- 15 -
Color
code
Red
Grey
current
range,
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