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| NeoTechs newbie melting endevours. ;) |
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| NeoTech:
So i went and made this.. flare type thingymajig.. It seems to have done 2 things.. 1) Now i can feed the tube with more gas. (Ergo increase gas speed without blowing out). 2) I can open the choke up to about 25-30% depending on heat in the flare thingy, and thus increase the heat output - alot.. And the flame broaden alot but maintained the almost cant be seen deep blue color at this state. I tried to force it to start pulsing like it did before by taking the compressed air and simulate a strong "gust" from the side of the intake.. It didnt bite.. Buut if i turn off the gas on the tube but let the burner continue (running out of gas test). It starts to pulse when the gas tends to go out as suggested the gas speed was an issue. And the flare reduced the speed of it at the tip alot so now i can actually feed it in the speed it consumes the gas. Balance is achieved. |
| MetalCaster:
Now that you mention it, I have to run a flair on the end of my propane burner also. |
| NeoTech:
Well i thought i wouldnt have to, i choose a pretty big piece of pipe.. 35mm outside, 28mm inside. But its just straight and straight is good i guess if you need to project the gas far away.. there is actually a complete thread regarding gas speeds and consumptions on the physicsforum.. It was an interesting 60 pages read of what i could understand 10% of it maybe.. But i got the gist of the venturi principle. Its really a weird amount of math going into making a properly balanced gas burning tool.. Now this can weld stuff together.. im happy with it.. tomorrow if the weather gods let me, im gonna melt a couple of intake manifolds. |
| NeoTech:
So now my burner works as intended.. i took the opporunity and started to break up and melt some pistons and a transmission housing.. The colorblind dragons saids; Goooold! |
| vtsteam:
Flame stability and gas speed are two separate problems. You still have the capability of burning inside your burner tube, though you've increased stability at the flare. You now have two stable modes of burning. Outside and inside the tube. If you sleeve your burner tube starting at the choke and extending to the tip down to say 24 mm ID you will likely eliminate tube burning mode and increase safety. You may also mix a little better. |
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