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Thanks, Gunner. I misunderstood the post. Not sure if I'm ready to dive
into 3 phase converters - I may just sell the old beast and buy a 220 V DC
stick welder.
John
"Gunner" wrote in message
...
On Sun, 13 Feb 2005 13:30:03 -0700, "Doctor John"
wrote:
Hey Gunner - your old tofu eating buddy here....
We had a thread going on this before - can you give any specifics of how
to
wire the three phase to a 220 V single phase? Did you just hook the two
lines in to two of the three phase ins? I've got an old beater 300amp
continuous duty DC phase which I would really like to use. I don't have
a
DC stick welder other than this, and this has an auxiliary MIG wire feed
unit, so it could be a great machine, if I can just feed it the right
kind
of juice. Thanks
John
John....I was running the welder on 3ph, generated by a Rotary phase
converter, which is basicly just a 5 hp 3ph motor and some capaciters.
You feed it single phase, and depending on how its built, it will
either start itself, or you pull a rope wrapped around the motor
shaft, to get it up to speed, at which point it generates the 3rd leg
of power and gives you 3phase output. Mine happens to be an
older..very old in fact commerical rotory phase converter, but there
are any numbers of plans out there to build your own, using a surplus
3 phase motor, some relays and some capacitors.
http://www.metalwebnews.com/howto/ph-conv/fig1.html
http://www.metalwebnews.com/howto/ph-conv/ph-conv.html
http://www.metalwebnews.com/howto/ph...converter.html
http://www.homemetalshopclub.org/pro...nv/phconv.html
Ebay has some rotary phase converters also. You do NOT want a "static"
converter or a VFD for welding use.
There is a gentleman who builds panels, and you simply add the proper
sized surplus idler motor, that posts here on rec.crafts.metalworking
occasionally and he used to sell them on Ebay reasonably, if you dont
want to build your own from scratch.
As far as I know, only Inverter welders may be run from single phase,
by simply dropping the third leg (L3) but it does downrate the output
of the welder by about 1/3.
Gunner
"Gunner" wrote in message
.. .
I traded for a minty Airco PhaseArc 350 mig welder last week with the
idea of maybe either being able to run it from a 5hp rotary phase
converter that I run my machine tools in my hobby shop with, or
selling it and purchasing a single phase machine.
Yesterday morning, I wired it up, using a 12/3 100' extension cord. I
figured I might as well try it worst case. (yes, I know..no safety
ground..shrug)
To make a long story short, it worked beautifuly. I spent about 5
minutes doing nothing but filling the top of a chunk of plate with a
6" continious back and forth bead of .035 wire, thinking that
something should get warm, or reach welding time % and it just kept
feeding and burning with that marvelous frying bacon sound, with good
puddle and penetration. I sectioned a chunk of the plate with an
abrasive saw and penetration was very good.
I then loaded a spool of .045 dual shield and did the same thing. It
took a fair amount more volts of course, and every thing worked fine.
I do have an issue with the Arcomatic lV wire feeder with the bigger
wire, as its not the proper feed roller for that size I dont
think..but all in all it burned well. The .035 burned best with the
meter settings at 21-22 volts and the welding output amp meter showed
around 100-125 amps during welding. Today Ill put a amp meter on the
line and see what the actual draw on the RPC is
Everything remained nice and cool, even the horrendously long and
undersized extension cord remained cool.
A Rotary Phase converter is easy to build, lots of plans on the net,
and they can be built quite cheaply.
So picking up a decent commercial 3ph mig welder cheaply (since lots
of folks are going to inverter machines) is a pretty viable way to get
a decent commercial grade MIG welder and being able to run it on
single phase home power.
I dont have any 3ph stick or tig machines, so I cannot give any data
on what one of those would take to run.
YMMV of course.
Gunner, off to weld up a cart for that big ******* G
It's better to be a red person in a blue state
than a blue person in a red state. As a red
person, if your blue neighbors turn into a mob
at least you have a gun to protect yourself.
As a blue person, your only hope is to appease
the red mob with herbal tea and marinated tofu.
(Phil Garding)
It's better to be a red person in a blue state
than a blue person in a red state. As a red
person, if your blue neighbors turn into a mob
at least you have a gun to protect yourself.
As a blue person, your only hope is to appease
the red mob with herbal tea and marinated tofu.
(Phil Garding)
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