Looking for some recommendations from the group. I am looking for a torch
head for my oxy-acet set-up that will produce a large soft flame. Something
like a weedburner propane torch... but I would rather use the oxy-acet, just
cause I don't have a spare propane tank. Is anything available? Should I
just get a propane tank and weedburner set-up? Thanks, Ryan
Here's the propane torch I bought recently. I bought it just for the regulator
and 30 foot propane hose, but man this torch ROCKS! When I light it it has a
nice soft flame like a weed-burner. Then you pull the trigger and WOW!
Considering the price of propane vs. acetylene, I think it's a no-brainer. I
vote for a propane torch every time. By the way, Harbor Freight makes a knockoff
of the Magnum torch. It's real cheap. I looked at one in person, knowing what
mine looks like, and it sure looks cheaper, plus it doesn't come with a nice
regulator either. But my torch retails for big bucks and the HF one is cheap.
Come to think of it, I don't see why you couldn't build a burner like a
propane one and run it off acetylene. I imagine you'd want to run it lower
in pressure (below 15PSI, as opposed to up to 45PSI) so a larger design will
be necessary for as much power.. but you get an incredible amount of heat
with just around 10PSI anyway so I don't think it'll be a worry.
"That's for the courts to decide." - Homer Simpson
Rosebud would be the OA type for big flame - soft is just a matter of a
nice carburizing flame adjustment; I've done a lot of fiddly soldering
jobs with a welding tip and a very long, soft, carburising flame.
I haven't had a gas rig for a few years (used to use the ones at work,
don't have any at current work, have not had sufficient need to justify
the expense), but given that people bother to rig cutting torches for
oxy-propane due to lower gas cost, I suspect that propane would probably
be enough cheaper to run that it would make sense if you'll be doing
much of whatever it is you're doing with this.
You probably want a "Rosebud" torch. See your dealer and at least have
him demonstrate one for you. They aren't cheap, but they run on oxygen
and acetylene (or propane) and, depending on size, make a lot of heat.
I use one a lot for heating metals. The flame is "soft", but not BIG
like a weedburner. If I am heating a piece of 1" square bar for 4
inches, I don't want or need a flame that is 3" in diameter and a foot
The propane weedburners only get to about 2400 degrees F.
An oxy-propane rose bud can get to over 4000 degrees and, of course, the
oxy-acetylene rosebud goes even higher.
The weed burners that run on propane use propane and air. You can
also buy "prestolite" torches that run on acetylene and air, but I don't
know that they come in sizes as big as the 500,000 btu weedburner.
You can probably buy a propane weedburner and a 20# propane tank for
less than you would pay for a rosebud, either oxy-propane or oxy-acetylene.
Whatever you do, remember that acetylene is illegal to have at over 15
psi outside the tank!!!!!
My understanding of that is that it's just like any torch but has like 6
jets in it. My idea is to basically take a naturally-aspirated (air, not
oxy) propane burner and feed it acetylene instead.
"That's for the courts to decide." - Homer Simpson
I have one of these (or something very similar, from Northern Tools).
It's sold for melting roofing tar. It's also dubious to use it
commercially, as it connects directly to the cylinder without a
regulator (UK fire officers throw a fit when they see it).
Handy for weeds and bitumen, but not much else. Big flame, low
temperature. Is your Magnum torch any hotter ?
BTW - What's a "rosebud" torch ? (not a word we use in the UK) I
thought I knew, but it's not anything like the Magnum torch in that
My Magnum torch *looks* like it throws a lot of heat. I haven't used it
that much yet. I've spent a lot of time around torches, though. I used to
be a shipfitter and spent 8 years where my primary tool was a torch.
I think "rosebud" may be a Yankism. To me it means a torch with a head on
it about as big as your fist, which throws a gigantic amount of heat.
Probably does - not very hot though. That's the problem with mine.
Ah. I thought it meant an oxy-acetylene blowpipe, where there was a
small interchangeable tip on a fixed neck, instead of the swaged pipe
where the neck and nozzle swap as one unit.
Brian Lawson wrote: Drop into the welding supply retail store and ask to
see a "rosebud" tip
A "rosebud" tip is designed primarily for, rather than welding. It has
multiple flames, arranged in a circle, so the heat is spread out more than
from a welding tip. If you use a cutting tip without the cutting oxygen,
you have the equivalent of a "rosebud."
I have used 2 rosebuds together to heat a 1,400 lb coupling half that was
about 4 feet diameter, around 14 inches thick at the hub, with a 12 inch
bore to shrink-fit it onto a shaft that was .024 larger than the ID. They
suck up a lot of fuel if you are using a large one, but they will put out
some serious HEAT. I have even been known on occasion to "preheat" my shop a
little with mine till the furnace got going good.
I run propane from a 100 pounder tank in my torch rig in my home shop, and I
honestly cannot remember the last time I had to fill the tank, using the
standard cutting/brazing torch. The big rosebud, however, will "suck the
bottom out of a tank", as they say.