[Shop-talk] Yet another TIG Welder question

[Douglas Braun]

There seem to be some Chinese AC-DC welders starting at about $1000, but
that's not much less than the price of a Miller Diversion 165.

I don't understand why AC-DC welders are so much more expensive (and heavier)
than Dc-only machines.  I was looking at the Diversion schematic, and the
AC capability is supplied by an electronic inverter switch between
the Dc power supply and the gun.  The inverter is basically 4 big transistors
that alternately connect the positive and negative output to the gun
and work connections.

Doug

On Fri, Jan 7, 2011 at 6:57 PM, Mark Andy <marka at maracing.com> wrote:
> Howdy,
>
> On Fri, 7 Jan 2011, Douglas Braun wrote:
>>
>
>
> I don't have any info, but have a related question...  The HF welder
> mentioned is DC only.  Is there an AC/DC TIG choice available before you
get
> to the $1.5k+ name brand stuff?
>
> Mark