Tig welder to purchase.

[JAMMER]

That 200 amp was good for 1/8 inch aluminum it takes a lot of heat for aluminum and what you are showing would take more than 200 amps I would say more like 300 amps to be safe because you are above 1/2 inch thick and like I said aluminum takes a lot of heat. Ed

[JAMMER]

Cooper question wit all that meat why don't you bolt it together with counter sink bolts? That would save you a lot of grief rather than trying to figure out what rod to use what heat range what electrode weather to use just co2 or co2 + nitrogen there is a lot more to tig welding than with just electric welding. There is a way to weld aluminum with a mig welder also. If I were you I would go and talk to a welder like I did or take a class at a welding supply store like Haun Welding Supply there should be one in your area I am still considering that my self. By the way that Eastwood is in PA. Ed

[RCP57]

I don't know if you would need 300amps but you have to think about duty cycle. I think my 225 at full power has 20% duty cycle or less. It won't build heat quickly enough to weld that thickness properly. To actually get penetration on 3/4" you need an industrial welder. Just bolt those parts together or you will be spending 6k on a welder...

[JAMMER]

Thanks Reg that is one thing I left out Duty Cycle that is how long you can weld at a certain setting . Ed