Welding-T.I.G.(Tungsten Inert Gas) or G.T.A.W.(Gas Tungsten Arc Welding) Points to Remember:
Tig welding can be used for joining practically all metals and alloys in various thicknesses and types of joints.
Be sure to use a cup of the correct size. Nozzles having too small an orifice tend to overhead and either crack or deteriorate very rapidly.
A water-cooled torch is recommended for welding currents that are above 200 or 250 amperes.
Argon is generally the inert gas recommended for Tig welding.
The power source can be either a DC or AC machine. With a DC machine, better penetration is usually obtained with straight polarity. For some metals better welds are made with an AC machine having a high-frequency voltage than with a DC machine.
The diameter of the electrode depends on the kind and thickness of the metal to be welded. Make certain the tip is properly shaped for the type of current used.
When welding light gage metals, it is often necessary to use back-up bars.
Before starting to weld, always check to make sure the electrode extends the correct distance.
Follow the recommendations for the correct gas flow, otherwise the shielding gas will not be effective.
If filler rod is to be used, be sure it is of the right diameter.
Always make sure water is flowing before attempting to operate the shielded-gas spot welding gun.
Never attempt to adjust the tungsten electrode without first shutting down the power supply machine.
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