Rods approximately 1 m in length are used as filler metals for manual welding and wires coiled onto rolls are used for mechanised GTAW. C-Mn steels as well as low and high-alloyed steels are welded almost exclusively with direct current and the negative pole on the electrode.
From the following table it is possible to determine how high the load on the tungsten electrodes can be depending on diameter:
Diameter of rod Ø [mm]
Amperage (direct current polarity negative) [A]
25 - 70
50 - 110
15 - 150
80 - 160
50 - 220
120 - 220
80 - 320
150 - 300
120 - 400
The scope of application stretches from the welding of thin sheet metal in non to high-alloyed qualities to high-quality root welding in thicker plates and tubes in these materials.
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