Right, I know I've gone on and on about building a frame for about 2 years now, but I've finally decided to pull my finger out, so to speak, and actually do it. I've got the time and hopefully the money now, so I'm going for it. My grandfather is offering me his acetylene torch, hoses and regulators, and in order to make it work, I plan to hook a household propane tank up to the acetylene hose, and a compressor to the oxygen one. Acetylene is almost impossible to come by in the UK, as is high-pressure oxygen, but propane tanks and compressors are much easier.

Firstly, am I likely to blow myself up doing this? Obviously, I'll need some form of valve to keep the air out of the hose with the gas in, and vice versa, but apart from that, I see it as being safer than oxy-acetylene because a) propane needs air to cause an explosion, unlike acetylene and b) it only uses one cylinder rather than two. However, I'm not an expert in this, so if anyone knows more about this than me, please feel free to shoot a hole in my theory.

Secondly, is it even possible? Will the fittings on a propane cylinder work with a hose for an acetylene one? What about the regulator?

Thirdly, will this provide a hot enough flame, of the right type, for fillet-brazing?

Thanks in advance