OA working pressure and a neutral flame

welding or cutting? Dan

Well, it relates to cutting, but a neutral flame is the common denominator. - Mike

snipped-for-privacy@krl.org wrote:

I think I just thought out the error in my thinking. There is a preheat O2 control, a preheat acetylene control and a lever which can deliver up to the O2 working pressure. The pre-heating circuit and the cutting circuit are completely seperate. That negates the direction of my question. Thanks anyway - Mike

wrote: (clip) The pre-heating circuit and the cutting circuit are completely seperate. That negates the direction of my question. (clip) ^^^^^^^^^^^^^^^^ The way cutting torches are built, the cutting pressure is delivered to the torch, and the preheat oxygen pressure rides "piggyback" on that. It is reduced to a much lower pressure through a separate valve. So, as you keep raising the oxygen pressure, you will have to keep closing down the preheat oxygen to keep a balanced flame, and you will keep getting a stronger cutting action. Past a certain point, you will be wasting oxygen, and getting too large a kerf.