[TheForge] Re: Burning Metal

Wed Nov 5 20:05:04 2003

Not sure about wood, but it should work if the wood isn't too thick.
I accidentally discovered this phenomena when I was trying to cut a 1/4"
steel shell, to salvage the 3000F 3" thick mizzou castable refractory liner.
The torch cut the steel fine, but when I removed the shell the plasma arc
had cut about 2" into the refractory.
Chuck
----- Original Message -----
From: "shannell Sugrue" <[email protected]>
To: <[email protected]>
Sent: Wednesday, November 05, 2003 5:45 PM
Subject: Re: [TheForge] Re: Burning Metal


> Works on mirror too, the reflective layer conducts, silver or tin or
> something isnt it?
>
> ----- Original Message -----
> From: "Ralph Sproul" <[email protected]>
> To: <[email protected]>
> Sent: Thursday, November 06, 2003 7:37 AM
> Subject: Re: [TheForge] Re: Burning Metal
>
>
> >         Thanks Chuck,  These are all things I haven't tried.  Does
plasma
> > actually cut wood with that thin conductive material?  What a way to
make
> a
> > patern for multiple cuts, if it does.  Seeing as I ain't tried
> this.......do
> > you need sheet metal on both sides of the item to keep the arc lite on
the
> > plasma??  Very cool stuff to try.  What type materials do you cut for
> > example......plastics, wood, or rubber?  How is the smoke or is it so
dam
> > hot and the stream pressure high enough it doesn't matter?
> >         Now you've got me off on another tangent to take me away from
this
> > job I gotta get done........... :-(
> >
> > Ralph
> >
> > ----- Original Message -----
> > From: "Chuck Robinson" <[email protected]>
> > To: <[email protected]>
> > Sent: Wednesday, November 05, 2003 1:53 PM
> > Subject: Re: [TheForge] Re: Burning Metal
> >
> >
> > > Hey Ralph,
> > > Use your ESAB 875  I.  it will cut thru the C/I like butter. Cut is
> almost
> > > as clean as one in steel.
> > > I also use mine to cut thru non conductive materials by wrapping it
with
> > > thin steel sheet (1006-8) cut from old 55 gal drums.
> > > Chuck
> > > ----- Original Message -----
> > > From: "Ralph Sproul" <[email protected]>
> > > To: <[email protected]>
> > > Sent: Wednesday, November 05, 2003 6:37 AM
> > > Subject: Re: [TheForge] Re: Burning Metal
> > >
> > >
> > > > Thanks Pete, that gives me a base line to try it out on.  I have
some
> > > broken
> > > > cast sections(legs and frames) with radiating fractures.  I'd like
to
> > > remove
> > > > and put sawn in sections from cast plates I have.  This is an
> > interesting
> > > > solution.  I also have plasma and carbon arc torches to play with so
> it
> > > > should be a fun project testing all these out .....just after a
rainy
> > day
> > > of
> > > > course down in the field where this all lays in wait.
> > > >
> > > > Ralph
> > > > ----- Original Message -----
> > > > From: "Peter Fels And Phoebe Palmer" <[email protected]>
> > > > To: <[email protected]>
> > > > Sent: Wednesday, November 05, 2003 12:18 AM
> > > > Subject: Re: [TheForge] Re: Burning Metal
> > > >
> > > >
> > > > >
> > > > >
> > > > > Hi Ralph:
> > > > > It depends on how much extra heat you need to sustain the cut,
which
> > is
> > > > > to say, how thick the cast iron is. My recollection is using 1/2"
> > scrap
> > > > > to fuel  a cut in 3/4" cast iron and it was a ragged cut. Could be
> it
> > is
> > > > > more controllable with practice....Pete F
> > > > >
> > > > > Ralph Sproul wrote:
> > > > >
> > > > > >Hi Pete, That's an interesting idea - I've never tried that, but
> > would
> > > > like
> > > > > >to.  Do you use something light like 1/4" or does it take 1/2 to
> keep
> > > the
> > > > > >oxidizing stream going?
> > > > > >
> > > > > >Ralph
> > > > > >
> > > > > >----- Original Message -----
> > > > > >From: "Peter Fels And Phoebe Palmer" <[email protected]>
> > > > > >To: <[email protected]>
> > > > > >Sent: Monday, November 03, 2003 9:13 PM
> > > > > >Subject: Re: [TheForge] Re: Burning Metal
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >>One can use a sacrifice piece of steel to sustain a torch cut
in
> > cast
> > > > > >>iron..carbon isn't the critical factor..plain iron seems to
> be...PF
> > > > > >>
> > > > > >>Andy Gladish wrote:
> > > > > >>
> > > > > >>
> > > > > >>
> > > > > >>>>I think if the carbon content was the accelerating factor,
cast
> > > > > >>>>iron should
> > > > > >>>>cut easily.
> > > > > >>>>The  best I can do on cast iron with an O/A torch is a very
> sloppy
> > > > cut.
> > > > > >>>>My plasma torch however cuts it easily.
> > > > > >>>>chuck-
> > > > > >>>>
> > > > > >>>>
> > > > > >>>>
> > > > > >>>>
> > > > > >>>I think that what is happening when I use an O/A torch to cut
> cast
> > > iron
> > > > > >>>
> > > > > >>>
> > > > > >is
> > > > > >
> > > > > >
> > > > > >>>that the preheat is melting the metal and the oxygen jet is
> blowing
> > > it
> > > > > >>>aside. Way different from the sharp, clean cut (burn) I get
with
> > > steel
> > > > > >>>
> > > > > >>>
> > > > > >when
> > > > > >
> > > > > >
> > > > > >>>things are set up correctly.
> > > > > >>>So, a torch will 'cut' things that it can't 'burn'.
> > > > > >>>Andy G.
> > > > > >>>
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