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:
Amperage (direct current polarity negative) [A]
Diameter of rod (mm)
25 - 70
50 - 110
80 - 160
120 - 220
150 - 300
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. The use of thoriated electrodes is not recommended since radioactive dusts are released during welding and grinding.
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