Thanks Doug. I was looking today at the Eastwood 200 digital. This has some real nice options on it. And cheaper than the lincoln and miller.
Rick, learn about what the duty cycle does and what it is on individual machines. Every machine is different and your intended use will determine the machine to buy. If you are going to be doing production welding where you need the machine to run all day and not cyle into the duty cycle you need to spend a lot of money. If you are going to be doing small projects where your setup time allows the machine to cool then a lower end machine is all you need.
For example the Eastwood Tig is listed as having a 60 percent duty cycle at 190 amps using 220 volts input. My Miller Diversion that cost 3 times as much has a duty cycle of 10 percent at 180 amps using 220 volts input.
Duty Cycle - the amount of time a machine will operate at a given amperage. Example - The Diversion says 10 percent at 180 amps and 100 percent at 60 amps. That equates to it welding constantly for 1 minute and resting for 9 at 180 amps or welding constantly and not resting at 60 amps. The Eastwood Tig says 60 percent at 190 but does not give any other amperage duty cycle numbers. That equates to welding constantly for 6 minutes and resting for 4.
The machines will do this automatically so it is not something that you can fudge on. It will shut down and restart when the internal sensors are overheated and rest until it is cool enough to weld again.
Now my 2 cents for all it is worth. I have welded for a long long time and I have never run a machine into the duty cycle. Also I cant see the Eastwood Tig having a true 60 percent duty cycle... :shrug: That is a lot of guts built into the machine for the money it cost.
All of the above being said you probably aren't going to be running the machine set up wide open and weld constantly for long enough that it will ever make a difference in my opinion.
All the machines that I own have never been run "wide open" for any reason. I step up to a bigger machine and do the job with the proper machine. I am fortunate to have anything from 5 amps to 300 amps. Most people have 1 machine or maybe 2. They might encounter the need to run a machine wide open.
Doug