Hi Nabzim,

I know that a blue flame is the hottest you can get which is what you do when welding with either oxyacetylene or oxypropane but even though the perfect flame is achieved with a 2 to 1 mix fuel to oxidizer the mix also depends on where you are if you are in a very humid area then you will need a little more oxygen and in a very dry area you normally need a little less.

In many years past friends and I use to build a set for home welding using a carbide lamp base which uses calcium carbide and water to produce acetylene and one of the medical oxygen cylinders both of which we could get from our local chemist the torch we made at work as they had all of the machine tools you could dream of and use in a lunch time was available, we even managed to use it to cut by heating the steel up to a orange colour then turning up the oxygen and then using the steel for a fuel whilst it was not the best way to cut it was the easiest way to mange at home as we were not allowed full size cylinders at a residential address.

forgot to say last time, a great instructable many thanks for all your work.

Regards Poppy Ann.