With MIG - How much wind matters?

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I have a smallish garage and was wondering how much wind creates an issue with MIG welding?
Reply:When your weld pool foams like a sack of crabs - you have too much wind.
Reply:Get a feel for the amount that will screw it up by using a fan. Weld some scrap and adjust the fan till it messes up your weld - then you'll have something to judge it by.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Originally Posted by weldertomWhen your weld pool foams like a sack of crabs - you have too much wind.
Reply:WeldordieI'm even more off the Coast then you, and I can smell weldertom's sack of crabs from here.  I don't need to see it - because the smell is not pretty.Opus
Reply:3-5 mph can be ok, you can tell from weld appearance when it is excessive. Put up something to deflect wind, change your position relative to the weld or move inside when welding.  Some experience will tell you, I like the idea of using a fan to test.  I know I have tried to use a fan in shop to keep things comfortable when welding during hot weather, finally gave it up as a poor choice.
Reply:It does not take much air movement to move away your bottled gas. You really need to see for yourself and have a fairly important weld get messed up. It will really make you look bad too. A guy would be probably better served switching to flux core if he thinks wind can be an issue. I do not know if I have not done it enough to feel ok doing it but I do not like even using flux core if you can see the wind at the weld.