Tig with constant voltage power source?

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A constant voltage power source is direct current and is for gas metal arc welding.  If you hooked up a tig torch on the negative side and made a scratch start, could you tig weld with this method?  I have actually asked  other welders and people at the welding sales.  They say it won't work, but not why.  I just never took my torch off my  big miller drooper to try it.Will it work?  If not, why?   Thanks in advance.
Reply:Tig requires a constant current power sourceDennisThermal Arc 185-TSWMillermatic Challenger 172VictorO/AAtlas Craftsman 12 by 24 LatheEsab PCM-875Wholesalem Tool Mill-Drill
Reply:Has any one ever tried, and what was the result?  Why won't it work?
Reply:I have pondered this question before.  I am aware it will not work.  I am not really sure of why.  I will see what I can come up with.  Tommorow is my last day of school.  I graduate with an Associates of Applied Sciences in Welding Technology on Wednesday...YAYAYAYAYa.  I will try to remember to ask the prof. tomorow.  See what Answer I get.IF it Catches...Let it Burn
Reply:Hey Chris-ATTABOY!!!!!! Good Job!!
Reply:good job Chris congratsChuckASME Pressure Vessel welder
Reply:Congrats Chris...graduation!!!!Smithboy...if it ain't broke, you ain't tryin'.
Reply:You rock! That was my goal.Lincoln Power Mig 210MP MIGLincoln Power Mig 350MP - MIG and Push-PullLincoln TIG 300-300Lincoln Hobby-Weld 110v  Thanks JLAMESCK TIG TORCH, gas diffuser, pyrex cupThermal Dynamics Cutmaster 101My brain
Reply:Riley,back to your question, I wish I knew the answer, it can't be that difficult to explain!  All I can say is I looked at a volt amp curve for a typical CV power supply and the curve shows that at a normal TIG voltage of about 10 volts, the amperage is something like 300 or 400 amps?  Right now I don't have a clue how it would work, and I look forward to reading an answer I can understand.  Thanks for asking the question.P.S. Congratulations Tx, a great accomplishment, keep going if you have the opportunity, we'll be addressing you as Professor Redneck.
Reply:I hope TxRedneck didn't forget to ask the professor about that today.  I bet somebody knows the answer.  I actually called a miller rep about that a long time ago.  All he said was that it won't work.  Maybe it is a welder manufacturing conspiracy to sell more tig machines.   Just kidding about that. HaHa