Dear Crispin,
Perhaps you could use a MIG welder, swapping the Argon with Oxygen.
Regards,
Peter.
On 20/01/2012 04:19, Crispin Pemberton-Pigott wrote:
Dear Peter
>I can't follow Andy's figures for the stoichiometric volumes.
Agreed. He says several things that are suspect.
>C2H2 + 2.5 O2 = 2CO2 + H2O eg 2.5 volumes oxygen for 1 volume of
acetylene
>C3H8 + 5 O2 = 3 CO2 + 4 H2O eg 5 volumes of oxygen for 1 volume of
propane
Agreed.
In use, propane for cutting has to be held for longer on the surface
preheating and the gap is more critical during the cut. It is because
of the high gas velocity entraining air (cooling). Restarting a cut
that for some reason was stopped requires far more preheating and
tends to be messier and the O2 central port needs to be opened more
gradually to give the iron time to ignite.
There is a way to make your own cutting torch using iron wire as the
fuel! The only gas is Oxygen. They used to use it in the 1920's. It is
the appropriate technology way to cut two a inch plate without gas! In
the US I think they would call it a Redneck Cutting Torch. /Rooineke
gassnyspruitstuk/ in Suid Afrika. Ja. Maybe you would say /rodenek
snijbrander/.
Regards
Crispin
^(TM)
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