rosebud !!

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Hey Guys,just bought a rosebud tip for my Harris O/A set.  Its a size "no. 1" by the way.  I just want to use it to heat rod/bar prior to bending.  Looking for a few pointers on setup as far as pressures go.Gave it a brief try with both oxy & acetylene set around 5 psi....works for a few seconds then get a hell of a pop and it blows out....appreciate any advice
Reply:DANGER!  Will Robinson! DANGER! Do not light that tip again until you get the right tip chart from Harris. That is a good way to burn up a tip and get a flashback that might burn up the torch or worse!Weldtek
Reply:set the accetene @15 lbs..set the oxygen @ 30 lbs.. try that.. ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Hummm....  Did I read your post right Zap?  Every book and welding class I've taken always said Acetylene becomes unstable at 15 PSI and therefore to never set the regulator higher than 12 PSI...  I usually keep my acetylene at 10 or below just to be safe...Of course this is all a minimum of 10 year old memory...
Reply:Oh, and while on the saftey soapbox I also seem to remember to just barely crack the acetylene valve like 1/4 turn total...
Reply:they use ALOT of Fuel and Oxygen. I run 10-12psi acetylene and 20-25psi oxygen with my rosebud (on the rare occasions that I use it)
Reply:Don't know what size rod you're heating,but a heating tip(large welding tip) will heat almost as fast as a rosebud w/ a lot less gas usage.                     JMHO,                              MikeOl' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:There are a lot of welding charts out there that show very conservative numbers and others that run right up to the standard 15 psig safety limit. I suppose it depends on whoes tutorial your looking at.  I think the withdrawal rate is another safety factor that could be discussed. It also varies from a conservative 1/10th of the cylinder capacity to a number around 1/7th. Here's a generic site;http://www.thefabricator.com/Consuma...cle.cfm?ID=739
Reply:Here's some heating tip info. Looks like victor may run slightly lower than harris. See the note titled *****important*****.http://www.hoopersupply.com/heat.htm
Reply:thanks for the info/advice....i'm still a bit confused though, looking at the harris calorific site at the moment.  For my torch/mixer & rosebud they're recommending oxygen & acetylene at "equal pressure" from 2 psi to 6 psi ???  Thought I should have been okay with both of 'em set at 5....hmmmmmIn fact, it says right on the tube "set pressures equally".... might have to wait 'till monday and phone my friendly gasman!  Though its got me thinking now....i've used these things on jobsites before but of course if you're not paying for it yourself you're never worried about using gas, and I'm not sure if i've ever actually "set one up" .... think i've just grabbed a torch 'n fired it up....rosebud already fitted....
Reply:Originally Posted by PanozengHummm....  Did I read your post right Zap?  Every book and welding class I've taken always said Acetylene becomes unstable at 15 PSI and therefore to never set the regulator higher than 12 PSI...  I usually keep my acetylene at 10 or below just to be safe...Of course this is all a minimum of 10 year old memory...
Reply:DUDE! turn that thing downChuckASME Pressure Vessel welder
Reply:Originally Posted by chopper5DUDE! turn that thing down
Reply:good it's freeking me outChuckASME Pressure Vessel welder
Reply:I have a Rosebud torch tip that runs just fine at 5 Acet. and 6-8 Oxy. I actually prefer a large standard tip for heating since the HAZ is narrower. As to acetylene, I can't get my torch to light if it's set much over 6 psi. Someone mentioned just crackng the acetylene valve. That's OK but the Oxygen should be opened all the way so as to seat against the double seal that they have in that style of valve. Argon bottles are the same - double seal/open all the way, otherwise they can and will leak.
Reply:Originally Posted by gnm109I have a Rosebud torch tip that runs just fine at 5 Acet. and 6-8 Oxy. I actually prefer a large standard tip for heating since the HAZ is narrower. As to acetylene, I can't get my torch to light if it's set much over 6 psi. Someone mentioned just crackng the acetylene valve. That's OK but the Oxygen should be opened all the way so as to seat against the double seal that they have in that style of valve. Argon bottles are the same - double seal/open all the way, otherwise they can and will leak.
Reply:Both oxy and acet. should be set the same or close. I have always used 5 for acet. and 6-8 for oxy. The oxygen is what gives the heat. There is a big misconception of having to raise them up to higher pressures. This is very dangerous. That is why there are different size tips. This is true for sutting also. I have cut 1/2 plate with 5 psi acet. and 10 psi oxy. A little patience is all that is needed. Higher pressure just waste the gases. I guess if the company is paying for it, it doesn't matter, but good habits are always great to establish. I had a link to a welding manual from the Navy, if I can find it, I will post it. Lots of excellent information.Tony"Wherever you go....there you are"
Reply:Never turn the acetylene cylinder valve on more than 1 full turn. And if it has needs a wrench, leave it in place during use. Also, try a little experiment.Open the acetylene cylinder valve 1/4 turn. Set the working pressure (no more than 12 psi) and watch the cylinder gauge needle, if you see it dip and rise then 1/4 turn ain't enuf. You should open the valve 1/2 to 1 turn.The number one cause of flashback is starvation. Other than electricity, a torch outfit is the most dangerous tool in your shop!!!!!!!!!!!!!Weldtek
Reply:The biggest problem I see with using these rosebuds is hardly anybody ever has the right size of acetylene cylinder to feed these monsters. If you look at a fuel consumption chart for the average size rosebud you'll notice that they can draw between 45-70 cubic feet per hour. Safety wise you don't want to draw more than 1/7th of the cylinders capacity. So if you have a 140 cubic foot cylinder the most you can safely draw is 20 cfh. Your book probaly tells you to safely feed a rosebud that you'll need to manifold two-three larger cylinders together, which nobody ever does. Generally if your cylinder is full you can feed a rosebud for a little while, after the cylinder is drawn down it can't. You might be better off with a larger brazing tip, instead of a rosebud. Good Luck!
Reply:Originally Posted by ss42768The biggest problem I see with using these rosebuds is hardly anybody ever has the right size of acetylene cylinder to feed these monsters. If you look at a fuel consumption chart for the average size rosebud you'll notice that they can draw between 45-70 cubic feet per hour. Safety wise you don't want to draw more than 1/7th of the cylinders capacity. So if you have a 140 cubic foot cylinder the most you can safely draw is 20 cfh. Your book probaly tells you to safely feed a rosebud that you'll need to manifold two-three larger cylinders together, which nobody ever does. Generally if your cylinder is full you can feed a rosebud for a little while, after the cylinder is drawn down it can't. You might be better off with a larger brazing tip, instead of a rosebud. Good Luck!