JimmyO
Member
Yes you can definitely weld aluminum with a Mig. However to get good results the use of a shielding gas is neccesary. Aluminum Mig welds done with a wire that is self shielded(ie does not use a gas) look bad and are not nearly as strong. And because of aluminum's softness it helps tremendously to use a spool gun, as the aluminum tends to bindup in a typical 15' mig lead. Where the tig really shines is on thin material and on outside corners. On inside corners the mig definitely has the advantage as the wire feeds right through the center of the torch. With the tig it is often very difficult to get the torch and the wire in since they have to come in from different angles. Hopes this helps.
Jimmy
Jimmy