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Dear Crispin,<br>
<br>
Perhaps you could use a MIG welder, swapping the Argon with Oxygen.<br>
<br>
Regards,<br>
<br>
Peter.<br>
<br>
On 20/01/2012 04:19, Crispin Pemberton-Pigott wrote:
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<p class="MsoPlainText">Dear Peter<o:p></o:p></p>
<p class="MsoPlainText">>I can't follow Andy's figures for
the stoichiometric volumes.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="color:black">Agreed. He
says several things that are suspect.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText">>C2H2 + 2.5 O2 = 2CO2 + H2O eg 2.5
volumes oxygen for 1 volume of acetylene<o:p></o:p></p>
<p class="MsoPlainText">>C3H8 + 5 O2 = 3 CO2 + 4 H2O eg 5
volumes of oxygen for 1 volume of propane<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="color:black">Agreed.</span><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">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.<o:p></o:p></p>
<p class="MsoPlainText"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black">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. <i>Rooineke gassnyspruitstuk</i> in Suid
Afrika. Ja. Maybe you would say <i>rodenek snijbrander</i>.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black">Regards<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black">Crispin<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:black">™</span><span
style="color:black"><o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:black"><o:p> </o:p></span></p>
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