MIG welding or Gas Metal Arc Welding of aluminum is easily done and only requires a little extra equipment and skills. Extra equipment will be needed no matter what and if welding out of position it will require a journeyman skill level (that’s an understatement). Aluminum welds very well with MIG and it is best used on thicker materials that are in the flat position. You can weld thinner materials and out of position but those areas are only for the highly skilled and experienced aluminum MIG Welders. In most cases even if you are an experienced welder this is going to be very difficult to learn because of the way the puddle looks and the fast travel speeds used to weld out of position.