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Oxy-Acetylene Rosebud/Heating Tip Size
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wjohn View Drop Down
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Joined: 19 Jan 2010
Location: KS
Points: 2011 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wjohn Quote  Post ReplyReply Direct Link To This Post Topic: Oxy-Acetylene Rosebud/Heating Tip Size
    Posted: 11 Dec 2024 at 6:28pm
I have needed an OA torch setup for a long time, so I've been doing some research. I do not have a ton of personal experience with them other than high school shop class many years ago.

For the heating tips, I want to be able to heat up stubborn disk harrow gang nuts and such to free them up, remove WD/WD45 rockshaft lift arms, etc.

I understand the 1/10th (formerly 1/7th) tank volume withdrawal rate limit on the acetylene tank, so obviously the smaller the heating tip size, the better. It seems like MFA 4, 6, and 8 tip sizes are pretty common.

What's the smallest rosebud size that would do what I want? Then I can get a tank sized appropriately based off of that.
1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Coke-in-MN View Drop Down
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Joined: 12 Sep 2009
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Points: 41655 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2024 at 8:40pm
I have 2 victor torch barrels , different size , rosebud on larger unit has tendency to flash back often , small one works OK but as I switched to PROPANE rather than acetylene now for most torch cutting and welding I bought a propane rosebud , it works good , might need to go up a size if your doing heavy heating but propane is a lot cheaper .  
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Allis dave View Drop Down
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Joined: 10 May 2012
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Points: 2924 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Allis dave Quote  Post ReplyReply Direct Link To This Post Posted: 11 Dec 2024 at 10:14pm
UNless you're heating somehting really big even just the cutting tip works good for things like nuts
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Joined: 08 Apr 2012
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Points: 3792 		Post Options Post Options   Thanks (0) Thanks(0)   Quote IBWD MIke Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 9:42am
wjohn, I'll check mine when I get out to the shop. Drug home some more 'stuff' recently and have been heating with a torch with a welding tip. Not getting the job done so I brought in the other with the rosebud. It's a small Victor torch and the tank has no problem keeping up. 
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Ray54 View Drop Down
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Joined: 22 Nov 2009
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Points: 4578 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ray54 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 12:10pm
Check out being set up to use propane for heating as Coke was talking of. Unless you are figuring to learn "bale wire" (welding thin metal using bale wire as filler) welding or brazing you have no need of acetylene. As the cost has gone way up in the last 15 years. Propane will cut and heat for much less.

I guess it is my age showing but I have no luck with my sons mig in over 20 years of it being here. I go back to oxy-acetylene for patching thin stuff. But very much not the most efficient way of doing things today.
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Coke-in-MN View Drop Down
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Joined: 12 Sep 2009
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Points: 41655 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 4:23pm
It's hard to even get acetylene tanks filled now , many suppliers stopped handling it .
MAP gas is now what the offer or Propane .
 Ah the gas welding seems to be a lost art , now when I worked in gas station garage we used the coat hangars as rod filler and boss kept complaining he had nothing to hang his shirts on , along with laundry service charged him for the hangars  
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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mdm1 View Drop Down
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Joined: 12 Sep 2009
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Points: 2642 		Post Options Post Options   Thanks (0) Thanks(0)   Quote mdm1 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 4:43pm
Don't mean to hyjack this post but what do you have to do to switch to propane? I've heard you need to use different hoses. If someone would explain the process that would be appreciated. Thanks
Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Points: 954 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Jim.ME Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 5:10pm
Grade R hose is just of Acetylene as the oils in propane will degrade the hose lining.

Grade T is for Propane, propylene and natural gas.  It is good for acetylene as well.

If unsure of what you have for hose buy Grade T.  Torch heads and regulators do not need to be changed.

Cutting tips are different and some heating tips may be.  Different brands may have some differences in size and shape.  Best to review what you need for your torch head with your welding supply house.


Edited by Jim.ME - 12 Dec 2024 at 5:13pm
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DMiller View Drop Down
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Joined: 14 Sep 2009
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Points: 31333 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DMiller Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 5:43pm
Years ago found Propane Brazed Steel Welds tended to be brittle, uncertain why but resumed Acetylene and not an issue.
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Clay View Drop Down
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Joined: 11 Sep 2009
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Points: 9397 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Clay Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 7:06pm
Originally posted by DMiller DMiller wrote:

Years ago found Propane Brazed Steel Welds tended to be brittle, uncertain why but resumed Acetylene and not an issue.
Propane lacks carbon.  Acetylene has carbon.
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Coke-in-MN View Drop Down
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Acetylene is generally better than propane for welding steel because it produces a hotter flame, cleans metal surfaces, and is more flexible for different welding processes: 
http://www.w3.org/2000/svg" viewBox="0 0 24 24">
  • Flame temperature
    Acetylene burns at a higher temperature than propane when combined with oxygen, producing a flame of around 3,100°C compared to propane's 2,800°C. This higher temperature allows acetylene to pierce metal more quickly.
  • When acetylene burns in oxygen, it creates a reducing zone that cleans the steel surface. Propane does not have a reducing zone like acetylene and hence cannot be used for welding.
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Joined: 12 Sep 2009
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Points: 41655 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Coke-in-MN Quote  Post ReplyReply Direct Link To This Post Posted: 12 Dec 2024 at 8:24pm
Neighbor was doing railroad salvage , cutting up rail cars and track , the draw of torch was high on oxygen and he used 8 to 10 - 322 cu ft tanks per day . The draw on acetylene was also higher that tanks manifolded together could supply , so used 100 pound propane tanks but those would freeze up in a short time from heavy draw. 
  I keep acetylene tank on torch cart , but use propane as regular heat, cut and brazing gas but can easily switch just changing regulator over . Rose bud differ but torch tips work for either , cutting tips also differ in way gas mixes at tip with propane tip beig a 2 piece design  
https://rexarc.com/blog/acetylene-vs-propane-gas-welding/#:~:text=When%20acetylene%20burns%20in%20oxygen,cannot%20be%20used%20for%20welding.
Faith isn't a jump in the dark. It is a walk in the light. Faith is not guessing; it is knowing something.
"Challenges are what make life interesting; overcoming them is what makes life meaningful."
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Joined: 19 Jan 2010
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Points: 2011 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wjohn Quote  Post ReplyReply Direct Link To This Post Posted: Yesterday at 11:35am
Thanks for all of the good responses and things to think about. I don't anticipate going through a ton of gas for breaking bolts loose and cutting nuts etc., and the acetylene is more flexible so that is probably what I will start with. I would like to learn to do some welding/brazing with it eventually. If I get into a ton of heating/cutting in the future I can look at a propane setup to save money on gas. Sounds like that might be the way to go to preheat a big chunk of cast iron if I need to. I'd love to be able to repair cracked cast iron eventually.

I need to make the rounds in town and figure out what sizes of acetylene tanks are even available locally, how suppliers fill/exchange, etc.

It doesn't sound like most folks are using big heating tips for the type of work I want to do at the moment, so based on tank availability I'll size for a Victor 4 or a 6 heating tip. I think the 4 MFA comes in some of the Victor starter kits. If I really need to preheat a huge casting that seems like the time to also expand into propane capability.
1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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