TIG welding mild steel using MIG wire: possible?

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Hi! Is it possible to TIG weld mild steel using MIG wire as a filler rod???is it a strong weld? Or is it crack prone?The beads turned a bit wide but it has no porosity.Its already done, so I want to know if I have to do it over or is it fine...It mild steel that was welded and it has 2 weld passes with TIG using MIG wire.
Reply:There have been many threads posted about this. solid mig wire makes fine filler. If you need thicker filler just double or triple the wire, and twist. Of course the wire needs to be compatable with the base. You only need to be 2% smarter than what you are working on.Lincoln pm140hacksawa big hammer
Reply:Yes, that is fine. Welcome to Weldingweb.John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:Usually you only use mig wire if the tig filler is too big..Sucks trying to straighten it out.. .045 is the smallest 70S-2 you can get..So for those miniscule places thats the only option sometimes.....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:I tried to weld razor blades in a T joint.  All I did is burn through. I used .023 mig wire Er70S-6.  I couldn't keep the arc going that low It kept trying to restart although it was already going.  Should have set it on touch start and get the arc going on a tab before I get to the razor blade.   Next time.Good thing they  come a hunert in a box.  DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:David, how low does your Thermal Arc 185 go?I had problems welding 24 gauge with my a Miller Shopmate and a High Frequency Box but then used my Thermal Arc 190GTS and it worked.  I had to fuse, no filler rod.
Reply:I have welded 10 amps with stick, I think it goes down to 5 on TIG.  There wasn't much of an arc, so I think it "didn't see it" and kept on trying to re start it.  I held the torch to the  plate, pushed the pedal just a little and watched the ampmeter on the machine.  It kept going to 22 amps.    Like I said, I will try again in Lift arc mode.  Maybe set the max to 10 amps.  I was using a grey tipped .040 tungston.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:If we have time after class...............................zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by zapsterUsually you only use mig wire if the tig filler is too big..Sucks trying to straighten it out.. zap!
Reply:I know you were laughing but in case you were serious, cut to length, lock one end in vise, spin other end with drill = straight wire.
Reply:AWS A5.18 is the Specification for Carbon Steel Electrodes and Rods for Gas Shielded Arc Welding.  The "electrode" wire for MIG is the same as the filler "rod" for TIG, no difference.  ER70-2, -3, -4, -6 may be used for MIG and TIG.AWS A5.2 is the Specifcation for Carbon and Low-Alloy Steel Rods for Oxyfuel Gas Welding.  The chemistry of the oxyfuel rods R45, R60, R65 is a little different than the ER MIG/TIG wire.  The MIG/TIG wire typically has a lower range for carbon, and a higher range for silicon.