HF start and AC possible without gas?

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I'm new to tig welding and I bought a cheap tig welder with some problem regarding the display, I fixed that, but I need to know if it works before i buy more stuff.So the Hf start doesnt seem to work without the gas same as the AC is this because I didnt use argon gas?
Reply:You need a shielding gas for tig welding... Do some research on the process.Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power) Hobart MIG
Reply:You will vaporize your tungsten almost instantly and have a big burned mess.   Yes you need gas.Tiger Sales:  AHP Distributor    www.tigersalesco.comAHP200x; AHP 160ST; MM350P,  Spoolmatic 30A; Everlast PowerTig 185; Thermal Dynamics 60i plasma.  For Sale:  Cobra Mig 250 w/ Push-pull gun.  Lincoln Wirematic 250
Reply:You need 100% argon gas. As already mentioned you should probably do some research before you cause yourself much frustration and tungsten damage.-DoogieMiller 350PMiller Trailblazer 325 EFI w/ Excel PowerLincoln LN25 suitcase welderXMT 304/22a feederMiller Syncrowave 350LXMiller EconotigHobart Handler 140(2) Uni-Hydro 42-14Hypertherm 65 plasmaWEBB Gap bed lathe
Reply:Originally Posted by romanvSo the Hf start doesnt seem to work without the gas
Reply:actually I don't believe it is independent. I think you have to have sufficient gas flowing for the HF to actually initiate a welding arc. This is not referring to the HF arc, but the actual welding arc initiation. From the miller web site:Miller Multimatic 255
Reply:HF will start with no gas if its working. AC will also start with out gas if its working. You will burn up your tungsten but it still should work.www.georgesplasmacuttershop.comPlasma Cutter and Welder Sales and Repairs--Ebay storeTec.Mo. Dealer Consumables for the PT and IPT torch's
Reply:I fixed both problems ac was just a setting mistake and the hf starter was due to dirty hf contact points.
Reply:Originally Posted by romanvI fixed both problems ac was just a setting mistake and the hf starter was due to dirty hf contact points.