Originally Posted by 20/20 vision

erm... that's what air cooled means,and if you're not sure then look here

https://www.tbws.co.uk/product-categ...s/tig-torches/

http://www.weldingtipsandtricks.com/tig-torch.html

cheaper machines have lower duty cycle - that's what you pay more for in a pro machine - what are you talking about FFS?

however, for the sake of the OP and other interested observers I'll clarify. lots of stuff is air-cooled inc early porsche engines or the motor in your vacuum cleaner or your microwave oven or an inter cooler or someone's sweaty palms as they enter garbage on here.

specifically in the case of welding equipment, the power devices in the welder's electronics create significant amounts of heat which they dissipate to their heat sinks which the cooling fans then remove to atmo. from a design standpoint, the ability to do this reliably would typically be considered within the overall envelope of heat management which includes the torch's ability to stay within its design limits and the whole calculation *is* the duty cycle of the whole machine.