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Guidelines for the TIG welding current needed and recommended electrode
sizes etc. for different gauges of material are shown in the chart below:
Metal
Welding
Current
(Amps)
Workpiece
Thickness
(mm)
Filler Rod
Dia (mm)
Welding
Electrode
Dia (mm)
Gas Flow
ltr/min
Mild
Steel
20-30
1
0-1
1.6
4-5
60-80
2
1.2-1.6
1.6
4-5
80-110
3
1.6-2.0
1.6/2.4
4-5
100-130
3.5
2.0-2.4
2.4
5-6
130-140
4
2.4
2.4
6-7
140-150
4.5
2.4
2.4
7-8
150-160
5
2.4
2.4
7-8
Stainless
Steel
15-35
1
0-1
1.6
4-5
60-80
2
1.2-1.6
2.4
4-5
80-115
3
1.6-2.0
1.6/2.4
4-5
100-130
3.5
2.0-2.4
2.4
5-6
130-140
4
2.4
2.4
6-7
140-150
4.5
2.4
2.4
7-8
150-160
5
2.4
2.4
7-8
Copper
80
2
2.0
1.6
5-6
125
3
2.4
2.4
5-6
135-150
4
2.4
2.4
6-7
150-160
4.5
2.4
2.4
7-8
