Re: To Invertec or not to Invertec

A textbook about 10 years old says that inverter units increase the input power from 60 Hz (cycles) to several thousand Hz, then can use a smaller transformer (more efficient than transforming than at 60 Hz it says) to step down to the welding voltage, then convert that high freq power to low freq AC or to DC for welding. I assume amperage would not change with frequency so the transformer wires would be as heavy as a 60 Hz unit, just transformer overall size is smaller for the high freq. It is nice to have a welder that you can take to the job without using a hoist.

Vernon wrote:

Kodiak,

I'm giving you my opinion free.  And likely over priced at that.

If I'm not mistaken"Invertec" is simply Lincoln's cute buzz word for
"inverter technology".  I am electrically challenged.  Therefore, I
can't give you a technical definition of what an inverter is/does.

But, as I conceptualize it, an inverter converts (inverts) DC to AC or
vice versa by means of diodes and doo-dads rather than by copper
windings.

The good result is small size, light weight, low power consumption,
impressive duty cycle, and a very smooth arc.

On the other hand, I've heard several people say that when an inverter
machine fails they're often not repairable.  At least not at a
reasonable price.

I have a Miller Maxstar 140 inverter machine.  Plus I have several
transformer machines.  The Maxstar is a damned lovable little guy.  I
bought it last.  If I'd bought it first I quite possibly wouldn't have
bought any of the other machines.

However, I have always assumed that my as yet unborn grandchildren -
and perhaps THEIR descendants - will be welding with the transformer
machines.  Or at least scrapping 'em for copper.  I will be surprised
(or at least I would be if I were still around) if they'll be welding
with the Maxstar inverter machine.

I trust Miller inverters more only because I've had good luck with one.
Don't know about the "Proline".  But I sure wouldn't pay $2500 for it!

V



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