Clarke AT101 - TIG Welding Current and Electrode Guidelines

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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 30 1 0-2 1.6 4
70 2 2.0 1.6 4
115 3 2.4 2.4 4.3
125 3.5 2.4 2.4 4.6
Stainless
Steel
35 1 0-2 1.6 4
80 2 2.4 2.4 4.3
125 3 2.4 2.4 4.6
Copper 80 2 2.4 2.4 5
125 3 3.2 2.4 5