oxyacetilene vs oxyproprane

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what's the difference between them?what isn't it possibile to do with oxypropane flame ?is it possibile to weld iron pipes like 1"1/2 2"1/2 ?
Reply:You can not weld any ferrous metals with oxypropane. The only fuel gasses that can be used to weld ferrous metals are acetylene and MAPP. These gasses along with propane and several other gasses can be used to braze, solder and cut.
Reply:okif I want to weld a pipe (iron) with oxy-acetilene, is it possible to use tig filler material or is it necessary/better to use something else?
Reply:Originally Posted by bennettokif I want to weld a pipe (iron) with oxy-acetilene, is it possible to use tig filler material or is it necessary/better to use something else?
Reply:i am about to get a propane rosebud and some propane because with my 140 cf acetylene tank i can't do much rosebud work  without vioaltng the 1/7 rule...
Reply:While you can use ER-70S xx series for oxyacetylene or oxy/mapp welding, I suggest you use RG60 or RG65 either of which will prove quite effective on mild steel. Oxy/MAPP fusion welding is second to oxy/acetylene in my opinion for ease of use, but then again I have a great deal more practice with oxy/acetylene having to qualified in the 6G position per Sect.IX ASME B&PV code at one time. If you are primarily interested in brazing, cutting, heating or soldering propane or other another fuel gas can be quite useful, but you will use more oxygen for cutting with other gasses than with acetylene.
Reply:Weldbead please, quit worring about the rules and heat with the acy. You got to have one heck of a big rosebud to outrun a 140 bottle of acy. You sound a little silly, if you know what I mean. Harold
Reply:harold i might sound like a gaping ahole, but if you do the math , a rosebud ( mine )that uses 28 scfh shoyuld notbe run off a 140 cf tank.
Reply:Bad boys can get hurt using rosebuds without understanding what they require.ALL FUEL GASES THAT ARE LIQUID GOING TO VAPOR IN THE CYLINDER ACT THE SAME WAYIt takes time to go from lq-vapor and rosebuds use ALOT of gas, even the small ones.Selling this stuff for 17 years and dont know of any rosebuds that DONT REQUIRE  1 LARGE CYLINDER FOR EVEN THE SMALLEST SIZE.Use a large cutting tip without the o2 flapper to be safe, or research the manufacturers data so you dont starve the heating head-rosebud.
Reply:Ive been wondering why the torch manufactures even include a rosebud in the kits since so few people actually have the tanks to run one.  I just bought an oxy-propane rig and the specs for the rosebud that came with it say you have to have at least a 100lb propane bottle, and if its colder than 70 degrees they want you to hook, that up in tandem with another one.  ???  I don't think there's too many people out there with a 100lb propane tank in their torch cart.Miller 250x & Lincoln V205-TSmith Oxy-Prop torch
Reply:In addition to being the worst weldor on this forum, I'm probably also the least knowledgable, so to be safe don't read this post. I seem to remember something about welding with oxy-propane not working well because you get a lot more contamination in the weld than with acetylene. Isn't not that propane doens't get hot enough, but you either get too much carbon in the weld or too much oxygen or something. Maybe it has to do with the shape of the flame or something that even at stoichiometric ratios it doens't burn cleanly, or it mixes too much with the atmosphere, or something. I use a cheap $90 Oxy-Ace setup off ebay and just bolted it straight to a propane tank. The rosebud and cutting torches seems to work okay (but what do I know, I suck at everything and have never tried acetylene), and even the welding tips seem to work for brazing just fine. I've been using the rosebud on my gas grill bottle ever since I got it, and it's still only half empty--of course, I don't use it much. It seems to last 4 times as long as my oxygen bottle, which might be helpful if I could remember what size that was. It comes up to about my knee."To tell which polarity to use go to the bathroom and pour some water down the drain. If it runs clockwise use straight polarity. If it runs counter-clockwise use reverse polarity. Or if it just gurgles use alternating current." -RandomDave
Reply:Ive been wondering why the torch manufactures even include a rosebud in the kits since so few people actually have the tanks to run one. I just bought an oxy-propane rig and the specs for the rosebud that came with it say you have to have at least a 100lb propane bottle, and if its colder than 70 degrees they want you to hook, that up in tandem with another one. ??? I don't think there's too many people out there with a 100lb propane tank in their torch cart.
Reply:I am sorry. I apologize. I thought he was worrying about whether it was safe to overuse an acy bottle according to facts or somebodys ideas. I have never heard it wasnt safe to deplete or to use more acy than can be dissolved from a bottle. Fact being, I have never heard of any body blowing up cause their acy bottle got to empty or somebody sucked all the gas out to fast with a rosebud. I have welded since 1969, longer than some on here have lived and it just ticks me off to hear some guy from a welding school scare some kids with all these figures.  If I am wrong then come up with some proof that a bottle has blown up on this account and then I will stand corrected. May God bless. Harold
Reply:Harold do not question good theory with real world experiences. Good post.
Reply:I suppose I'll take oxygen + propane and not acetylenefor welding I can use tig, so no problem for thisWhat exactly can't be done using oxygen and propane and that could be done using oxygen and acetylene?
Reply:Originally Posted by bennettI suppose I'll take oxygen + propane and not acetylenefor welding I can use tig, so no problem for thisWhat exactly can't be done using oxygen and propane and that could be done using oxygen and acetylene?
Reply:Originally Posted by bennett. . .What exactly can't be done using oxygen and propane and that could be done using oxygen and acetylene?
Reply:and what about brazing? is there something that can't be done with oxy-propane?
Reply:Originally Posted by ChuckIve been wondering why the torch manufactures even include a rosebud in the kits since so few people actually have the tanks to run one.  I just bought an oxy-propane rig and the specs for the rosebud that came with it say you have to have at least a 100lb propane bottle, and if its colder than 70 degrees they want you to hook, that up in tandem with another one.  ???  I don't think there's too many people out there with a 100lb propane tank in their torch cart.
Reply:undecided yetacetylene is really too dangerous? incidents are really very frequent with acetylene?some of you got hurt? any cylinder explosion?I would take ox+ac, but I'm afraid.. what to do?what about melting copper? can it be done using ox+propane or it needs ox+acetylene to get good results?Last edited by bennett; 09-06-2010 at 04:48 AM.
Reply:If you intend to join metals together with it, go with oxy/acetylene.  If you want it for heating/bending/cutting, the oxy/propane works fine and is cheaper, easier and safer to store/use, lasts longer and is easier to get filled when it runs out.  I use oxy/propane on the truck and oxy/acetylene in the shop.  The oxy/propane does take longer to heat up and doesn't like to stay lit in the wind as well as the oxy/acetylene.   It's also harder to see the flame when adjusting the torch with propane.  You will get used to these characteristics though.MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:If you intend to join metals together with it, go with oxy/acetylene...
Reply:ive used acetylene, propane and mapp (propylene) i keep one acetylene rig just for brazing, will NOT EVER use propane, it sux! the rest of my rigs are all propylene... its cheaper in the long run and cuts a ton better than acetylene... this is my opinion of course, not text book, just experiencenothing fancy, just a few hot glue guns for metalwww.sicfabrications.com
Reply:will NOT EVER use propane, it sux!
Reply:essentially the same thing, just a different name.i dont dig propane just because you waste much more oxygen, out of position leaves lots more clean up, and takes a long time to start the cut, ever tried to gouge or sweat welds apart with propane? i doesnt work very well for me. try cutting something thicker than 2 inches with propane... in the heavy stuff, ive found little better than propylenenothing fancy, just a few hot glue guns for metalwww.sicfabrications.comI was thinking about this thread today, while I worked on a feasibility study. The study was to see if large corrugated panels could easily be made to "nest" together in a run, by cutting away an angle from one end of each panel.The approximately 10' lengths of angle were held by many stitch welds, rust and paint.  So of course I fired up the oxy propane to cut the stitch welded angle free Attachment 55447No grinding or any other tool, just oxy-propane.With the angle gone, that left a "step" for the next panel to seat to.Nested the panels together, and Shazam! Attachment 55448I cut a window in the tube so that the "flag" from the adjoining panel would pierce into the tube. Welded with your favorite paint burner, 7018.  Current courtesy of SA-200.Notice the distorted torch flame, in the upper left inset, below the chain hoist.Yes, it was windyI'll post a detailed thread about this project elsewhere. I just wanted to mention that I think propane is a great cutting fuel - thick, thin, rusty, painted, welded... whatever.Good LuckLast edited by denrep; 10-19-2010 at 11:48 PM.
Reply:and what about brazing using brass rod with oxypropane?is it possible or is too difficult?
Reply:Originally Posted by bennettand what about brazing using brass rod with oxypropane?is it possible or is too difficult?
Reply:I'll get the big oxygen cylinder (height is about that of a men) I wouldn't take acetylene because of I fear using that instable gas, propane seems much more surethe problem is that if I buy oxypropane torch and kit, and then I want to switch to oxyacetylene I've to re-buy almost everything
Reply:Originally Posted by bennett. . .the problem is that if I buy oxypropane torch and kit, and then I want to switch to oxyacetylene I've to re-buy almost everything
Reply:is there any big advantage of using the injector torches with propane?  I cut with propane, but use a normal positive pressure torch with alt fuel tips.  Seems to work fine.
Reply:the problem is that if I buy oxypropane torch and kit, and then I want to switch to oxyacetylene I've to re-buy almost everything
Reply:Originally Posted by bennettI wouldn't take acetylene because of I fear using that instable gas, propane seems much more surethe problem is that if I buy oxypropane torch and kit, and then I want to switch to oxyacetylene I've to re-buy almost everything
Reply:Originally Posted by bennett...p.s.: mapp and propylene, are the same thing or are two different gas ??
Reply:let me understand a thing:acetylene cylinders must NEVER be used horizontally (because of acetone)..  okis it possibile to move acetylene cylinder (with closed valve) for short distance horizontally or is it a very very unsafe operation? for example for the valve or something similar? because If I choose this gas I should move horizzontally for few metersLast edited by bennett; 09-11-2010 at 03:17 AM.
Reply:Acetylene can be stored horizontally indefinitely, and can be tipped to be moved.Horizontal transport in a vehicle of ANY pressurized cylinder is frowned upon only because the valve is least likely to be damaged, when facing up.You just need to give the cylinder half an hour or so vertical time before you try to use it.It just gives time for the acetone in the headspace to drip back down.If you keep your cylinders chained on a cart, the slight angle they reach from being rolled around shouldn't be enough to make you wait though.Originally, MC and B acetylene cylinders were actually made to be used horizontally, which is why very old cylinders have their valves at the side of the cylinder top, instead of centered.
Reply:if I take acetylene is it easy to learn to weld? I have experience with tig, and I did good welds
Reply:Skills should transfer pretty easily between O/A welding and TIG.The muscle movement in the hand feeding filler wire is identical.  The torch hand movement is slightly different, in that with TIG, arc length doesn't really control heat (which is counter intuitive actually), and O/A doesn't have pedal control.
Reply:I have to choose for tomorrowI can get argon (for tig) and oxygen (for oxypropane) or oxygen and acetylene (so I can't tig anymore)what to do?
Reply:LOL, why can't you have argon, oxygen and acetylene??  I have here argon, argon/CO2 mix, argon/oxygen mix, oxygen, acetylene, propane and butane.  Who says you can only have 2 gasses??MM350P/Python/Q300MM175/Q300DialarcHFHTP MIG200PowCon300SMHypertherm380ThermalArc185Purox oaF350CrewCab4x4LoadNGo utilitybedBobcat250XMT304/Optima/SpoolmaticSuitcase12RC/Q300Suitcase8RC/Q400Passport/Q300Smith op
Reply:LOL, why can't you have argon, oxygen and acetylene?? I have here argon, argon/CO2 mix, argon/oxygen mix, oxygen, acetylene, propane and butane. Who says you can only have 2 gasses??
Reply:98/2 spray arc gas. 98% Argon 2% Oxygen..