Which welder?

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I repair automatic gates and in the past used a lincoln mig welder to do the welding repairs.  Used a aluminum gun attachment as well.  Would a tig welder work for this application?  Do tig welders come in 120V?  Or is the mig welder the best option for the application?  Thanks for any input.
Reply:If what you have used in the past has worked for you then you should stick with it.  To get a tig that would run off 120v and do aluminum would be a $3000- $3500 investment from a name brand manufacturer.
Reply:I would like to go to a tig because I did not like the way the aluminum gun worked.  It was hard to control the weld.  I thought Miller had a tig that would work with 120V and priced around 2500.  If not tig, which of the migs are good machines that can also do aluminum?
Reply:TIG = usually more expensive machine, usually slower welding process, usually more control of weld and puddle because of ability to vary heat/amps mid-weld via finger or foot control, takes more skill to juggle torch + filler + pedal/finger controlMIG = usually less expensive machine, usually faster welding process, usually less control of weld and puddle, usually takes less skillIf GMAW on aluminum is not giving you the control you need or desire for the welding job, then maybe GTAW is the tool you need.  Test out the idea and practice to see if it is what you want/need.That said, if you are trying to do 'serious' work on aluminum with the spool gun or torch liner with a little 120V GMAW machine, you just may be pushing the machine/process limits for -that- machine.  Aluminum takes some amps to weld, because the thermal conductivity is higher than steel and that sucks the heat right out pretty darn fast.  So even though aluminum melts at a much lower temperature than steel, it takes as much or -more- amps/heat than the same thickness of steel in order to weld it.Your call as to what you want to do and how you want to do it.Lincoln makes the Invertec205T AC/DC machine.  It can run on 120V or 240V input power, but remember that there is only so much raw power you can get from a 120V outlet!  On 115V input power, the machine (even though it is a relatively efficient inverter machine) is limited to about 130 amps output at a 10% duty cycle.  That would be about enough power to weld 1/8 inch aluminum or so, at a pretty low duty cycle.http://www.millerwelds.com/resources...calculator.php  The best laid schemes ... Gang oft agley ...