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11
2.5 Welding power selection and electrodes
TIG welding electrodes and gas nozzles
In DC TIG welding we recommend the use of the WC20 (grey) type electrode,
however other types are available.
The welding electrode size (diameter) is selected depending on the welding
current/power to be used. An electrode with an insucient diameter
compared to the welding current will melt, while excessive electrode size
will make it more dicult to ignite the arc.
Generally speaking, a 1.6 mm tungsten electrode will cover currents up to
150 A, and 2.4 mm tungsten electrode up to 250 A DC current.
Before use, grind the tungsten electrode to a sharp point at approximately
1.5 times the diameter of the electrode. If the electrode touches the work
piece during welding, re-sharpen the electrode.
MMA welding electrodes
In MMA welding, the welding electrodes must be connected to the correct
pole. Normally, the electrode holder is connected to the positive and the
earthing cable to the negative connector.
It is also important to properly adjust the welding current so that the ller
material and coating will melt properly and the welding is ecient. The table
below presents the electrode sizes available with the MinarcTig welding
machine and the corresponding welding current values.
MMA Electrodes and corresponding current settings range
Electrode
diameter
1.6 mm 2.0 mm 2.5 mm 3.25 mm 4.0 mm 5.0 mm
Fe-Rutile
30-60 A 40-80 A 50-110 A 80-150 A 120–210 170–220
Fe-Basic
30-55 A 50-80 A 80-110 A 110-150 A 140–200 200–220
11© Kemppi Oy / 1339
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