What is the gas for in MIG?

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i see that mig welders can be used with just the wire-feed.  What then, is the purpose for the gas---when and why would you need to use it?2) What type(s) of gas?
Reply:There are 50 different welding processes.MIG or (GMAW) uses a solid wire with gas to make a shield to keep oxygen away from the weld. There is no slag on the surface after the weld is completed.(FCAW) uses a wire that is hollow inside and contains a powdered flux that when heated by the welding process makes the gas to keep the oxygen away from the molten weld metal.The FCAW process leaves a light slag on the surface that needs to be wire brushed before painting or re welding.In a beginning welding class all of these welding processes are explained.Last edited by Donald Branscom; 02-24-2011 at 05:49 AM.AWS certified welding inspectorAWS certified welder
Reply:welds are hot and they need to be protected from oxygen.. all welding processes in one way or the other include some way to accomplish that.
Reply:..From one noob to another, drop the $25 for the Miller Student Pack. It's money well spent and an invaluable reference for future questions. And there's a "sticky" just at the top of this forum, "Welding Gases for MIG & TIG explained". 'Might be a good place to look, eh.? "Search" is your friend..    d:^)  Schneeks..ESAB 161 LTSCommunicate & adapt, diggit.?ΜΟΛΩΝ ΛΑΒΕ
Reply:Originally Posted by 7A749I think it is more than obvious that this dood is doing little more than trolling for responses & has no real interest in the answers to his questions.Starting to look like either someone we know from past experiences spamming the board or an individual that is truly ignorant.Ignoring him at this point would be the best remedy.
Reply:Check out his previous posts.  He's the one that wanted to build a dragster with no welding experience.He also claims he is in a welding school and should post these questions to his teacher.What gas do i use for mig and why?
Reply:The investigation begins.....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 have used inner shield, outter shield, and gas coverage......I like the gas type MIG  for the simple reason it doesn't splatter all over your part and burn your clothes off...After tig welding for 20+ years it sucks to have to MIG something with CO-2......  Miller Dynasty 350Twenty Six HammersThree Crow BarsBig Rock
Reply:And I'm constantly being called out for not being "nice enough".Folks, there really are some DUMB QUESTIONS asked on a welding forum.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:Sundown,I always get a good laugh from your postmakes my day everytime
Reply:Originally Posted by SundownIIIAnd I'm constantly being called out for not being "nice enough".Folks, there really are some DUMB QUESTIONS asked on a welding forum.
Reply:Mig and FCAW use CV DC+ or CV DC-. Gas makes for cleaner looking welds but flux-core is use in building construction especially in seismec regions.