I think you mean TIG capable? An inverter based machine will have DC output which is night and day difference to weld with compared to AC, especially for an inexperienced or beginner welder! 140 amps will burn 1/8" 7018 no problem but it's always better to go a little bigger rather than smaller when it comes to welding machines. Inverters use way less power to run than transformer based machines.
Duty cycle is important. Duty cycle is the percentage of time a machine can be used in a 10 minute period. 10% duty cycle means you can weld for 1 minute but need to let the machine cool for 9 minutes. Most machines have a higher duty cycle at lower settings than what the duty cycle is based on. Duty cycle is always at specific amps and volts. Duty cycle is not cumulative which means you can't weld for 2 minutes and let it cool for 18 minutes to compensate. A higher amp machine should give a better duty cycle at the same setting than a lower amp machine would. Look at Puddles inexpensive 200 amp inverter he bought several month's ago. He really likes it and he has a shop full of top of the line equipment to compare it to. That should tell you something about inverters.
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