Welding Power Selection And Electrodes - Kemppi MinarcTig 180 Operating Instructions Manual

MinarcTig 180
TM
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1. Connect the hose to the reduced pressure side of the cylinder regulator, or flow meter
and tighten the connector.
2. Adjust the shielding gas flow rate with the flow regulation adjustment screw. A suitable
gas flow rate of between 8–15 l/min.
3. Close the cylinder valve after use.

3.4. Welding power selection and electrodes

TIG welding electrodes and gas nozzles
In TIG welding we recommend the use of the WC20 (Grey) type electrode for DC TIG
welding, however other types are available. The welding electrode size (diameter) is
selected depending on the welding current/power to be used. If too small an electrode
is selected for a given the current, the electrode will melt, and conversely too large
an electrode selected for a given current will affect arc ignition. Generally speaking a
1.6 mm Ø tungsten will cover currents up to 150 amps, and 2.4 mm Ø tungsten up to
250 amps DC current. Grind the tungsten electrode to a sharp point at approximately
1.5 times the diameter of the tungsten (length of point). If you touch the electrode to the
work piece during welding, please re-sharpen your tungsten electrode.
MMA welding electrodes
MMA welding electrodes must be used with the correct welding polarity (Normally the
electrode holder is connected to the positive socket, earth return in the negative socket)
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