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<Sync>
bah still unsure what is the easiest and cost effective way to make vacuum chambers
<Sync>
favoring a brazed Al construction now
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<berndj>
you building your own vacuum chamber?
<Sync>
yeah still on it
<Sync>
I need several too
<berndj>
pumps?
<Sync>
I have most types of pumps that are commonly used
<berndj>
what motivates against stainless steel?
<Sync>
the cost
<berndj>
they cost the same at my local scrap yard
<Sync>
I currently cannot weld Al which is annoying so I have to braze or oxyweld it
<Sync>
yes but I'm not going to use scrap metal
<berndj>
fair enough :)
<Sync>
(only because my local scrapyard does not have stainless in sizes I want)
<berndj>
can you TIG at all, or just not do it to aluminium, or not at all?
<Sync>
I do have a TIG welder
<berndj>
cheap one / fancy one?
<Sync>
it is a chinese one but it works reasonably well
<Sync>
but I almost finished my ac tig inverter
<berndj>
same here, but mine can only output DC, so probably can't do aluminium
<Sync>
I just need some better mosfets in the bridge to keep the losses low
<Sync>
you can do Al with a regular dc tig welder
<berndj>
i've been back-of-the-enveloping a diy welder too
<berndj>
i can't get it to work out cheaper than buying one :(
<Sync>
you just have to use DCEP and preferrably Ar/He mix
<berndj>
oh right, the DCEP trick
<Sync>
oh it was cheaper for me than buying one
<berndj>
with a giant fat tungsten electrode so you can just barely weld the thinnest sheet!
<berndj>
so, out with it then, what mosfets?
<berndj>
beefiest i've been able to find so far are IRF*2907*
<berndj>
* cost-effectively-beefiest
<Sync>
the 2907 have too low Vdss to have a good safety margin
<Sync>
I have FDH055N15A
<berndj>
i'm tempted to build an H bridge to chop up the DC output from my welder, but i don't know the welder well enough to know if it'll get angry about it
<berndj>
what open circuit voltage are you working at?
<Sync>
actually, I have not measured it
<Sync>
but it is around 60V iirc
<berndj>
mine hovers at about 75V
<Sync>
then your fets will be no good
<berndj>
dunno what limits it
<berndj>
yeah, 2907 is 75V i see now
<Sync>
I also have some IPW65R037C6 for the primary converter
<Sync>
the most costly semi in the thing is the SiC diode in the PFC
<Sync>
I currently combat some strange transients that kill my primary fets
<berndj>
oh and what's your capacitor bank like?
<berndj>
the caps i can find don't really seem up to the ripple current required