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2% thorium used in DC welding, hose contains recirculating coolant, hose contains power cable, 2% cerium provides arc stability, TIG torch can be water cooled, TIG torch can be air cooled, argon has low thermal conductivity, 2% thorium has long life, TIG torch consists of gas nozzle, TIG torch consists of electrode housing, TIG torch consists of hose, TIG torch consists of power cable, TIG torch consists of electrode, TIG torch consists of recirculating coolant, helium provides deeper penetration, electrode made of tungsten, air cooled used for low current, non-consumable is not included in molten weld pool, helium has high thermal conductivity, higher flow rate results in high cost, water cooled used for high current, electrode housing holds electrode, 1-2% lanthanum has long life, an inert gas provides gas shielding coverage, gas nozzle directs gas shielding coverage, 100% tungsten used in AC welding, an inert gas shields molten weld pool, an inert gas can be helium, an inert gas can be argon, TIG torch retains heat, 1% zirconium provides extremely stable arc, 1-2% lanthanum used for stainless steel, weld porosity causes weak welds, 100% tungsten provides arc stability, Other TIG Equipment includes gas cylinders, Other TIG Equipment includes safety accessories, Other TIG Equipment includes TIG torch, helium requires higher flow rate, tungsten has highest melting point, 1-2% lanthanum used in DC welding, 1-2% lanthanum used in AC welding, 1% zirconium used in AC welding, gas cylinders must contain an inert gas, argon requires slower flow rate, slower flow rate results in lower cost, 2% cerium used in AC welding, 2% cerium used in DC electrode negative, electrode can be 2% thorium, electrode can be 2% cerium, electrode can be 1-2% lanthanum, electrode can be 1% zirconium, electrode can be 100% tungsten, an inert gas prevents weld porosity, argon provides good cleaning action, argon provides compact high density arc, electrode is non-consumable