Pressure for Oxy/Acl torches: Welding  -- General Tractor Discussion Forum and Review Pressure for Oxy/Acl torches: Welding -- General Tractor Discussion Forum

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 02-20-2003, 16:43 Post: 49642
1st JD
2003-02-20 16:43:55
Post: 49642
 Pressure for Oxy/Acl torches

I just got a new set of torches from my loving wife as a gift. Always had a welder but really needed a set of cutting torches (well, kinda needed them). I put them together but I'm not sure of the pressures to run. The very small booklet that came with it is not very clear. Any help would be apprec. Thanks






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 02-20-2003, 17:37 Post: 49645
DK35vince



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 Pressure for Oxy/Acl torches

I'm going from memory, I have my Acl. set at around 12 or 14 PSI.
And the Oxy. around 35 or 40 PSI.






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 02-20-2003, 18:21 Post: 49649
Peters

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 Pressure for Oxy/Acl torches

I have a set and 2 sets of tanks, but have not used much lately. I guess it would depend on the size of the tip but 10 and 30 is what I normally ran for heating. Slightly higher pressures for the cutting tip.






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 02-20-2003, 18:34 Post: 49650
bullworker



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 Pressure for Oxy/Acl torches

the regulator presures are based on the tip size ,any welding supply will have a pocket chart that will tell you the proper settings for each tip. chances are you have a small tip for 1/4- 3/8 material and the proper settings, off the top of my head because i don't have my chart in my pocket should be for the acetylene 4 to 6 lbs and the oxegen 24to 26 lbs. there should be a red danger zone on your acetylene reg above 15lbs, thats because acetlene gets unstable above that presure. remember, never get oil anywhere near your torches it can be very dagerous. all welding supply stores have a big oxy-act poster showing dos and don'ts and some very vivid pictures of what can happen.






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 02-20-2003, 20:40 Post: 49666
1st JD
2003-02-20 00:00:00
Post: 49666
 Pressure for Oxy/Acl torches

Thanks for the info. The tip is actually a bit larger, 5/8- so I will increase to maybe 13 & 30. I'll practice some tomorrow, not around oil though. Just curious but what exactly happens around oil??? Doesn't sound pretty whatever it is.






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 02-20-2003, 21:13 Post: 49667
bullworker



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 Pressure for Oxy/Acl torches

the oxegen can create a very voltile atmosphere, mix that with oil and very high presure and you have created a very simple deisel engine with only one stroke , the power stroke, BANG






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 02-21-2003, 06:57 Post: 49686
TomG

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 Pressure for Oxy/Acl torches

I guess that your welders have been arcs and maybe you're pretty new to gas welding. Gas welding is all I've done and that was quite awhile ago. I think the differences in pressures noted here are the differences between welding and cutting tips. I'm not certain the question is clear whether the pressures are for welding or cutting.

The table that came with the kit should give OX and Acty regulator output pressures by tip number for welding tips and a separate table gave pressures for cutting tips. I learned my gas welding entirely from a basic book I bought at a welding supply It was a lot better than what came with the set, and the suggestion to buy a book from a welding supply shop is very good.

I can't recall the capacity of my old small set. I don't think cutting 5/8th material would be a problem at all, but welding might start pushing the capacity of a very small set. A big tip can be put on most any handle but whether the regulator has the flow to get the material hot enough and maintain sufficient tip pressure for a good weld is another question.






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 02-23-2003, 10:22 Post: 49820
Captain B



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 Pressure for Oxy/Acl torches

As the other replies have indicated, the pressure settings vary depending on tip size and whether you are welding, heating with a "Rosebud" or cutting. For welding the settings vary from 3 psi oxy/3 psi acty for thin material up to 5/5 for larger tips for welding half-inch material. If you are a relative newbee (as I am) or been away from welding for a while, I recommend one of two books highly. Richard Finch, Welder's Handbook or Jay Storer, The Haynes Welding Manual. Buy the Finch book if you only want to spring for one-he has a number of handy charts with pressure settings, etc. Both are readily available on the net and cheap. Your library should have them also.






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 02-23-2003, 10:37 Post: 49821
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 Pressure for Oxy/Acl torches

Pure oxygen can accelerate almost any materials combustion. Basicly non combustable material become combustable Al included, a combustable material become flamable, a flamable material become explosive. You need to be careful in enclosed area particularly.
Thing will burn in a pure oxygen atmosphere including fabric, wiring and astronauts. I am sure Gus does not wish that he gave his life in vain.






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 02-27-2003, 10:12 Post: 50182
AC5ZO

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 Pressure for Oxy/Acl torches

Low equal pressures on AC and O2 are needed for welding. A pressure of around 5psi is good for most smaller tips. The actual final "regulation" is done with the needle valves on the torch.

The reason for this is safety. With equal pressures for O2 and AC, you will not have one gas mix with the other in a rubber hose if you plug a tip. If one gas pressure is higher than the other, then a plugged tip can cause an explosive mixture of O2/AC to form when the higher pressure gas flows into the lower pressure hose. This can happen if you let your tanks run to zero pressure, also.

You should never run Acetylene at high pressures. (It is unstable.) 15 psi should be about the max. Acetylene is disolved in fluid in the cylinder and "bubbles" out of solution like the fizz in a soda when you use it.

Now it is a little different with cutting. You need higher O2 pressures to make the cutting jet and to burn out the steel in the cut area. Since a cutting tip has several holes it would be difficult to completely plug it up and cause an explosive mixture in the hose, but it does happen. Flashback arrestors are for this very purpose. Even with a cutting tip, you are adjusting the heating flame mixture with the needle valves, not the regulator.

Rosebud tips use higher equal pressures of O2 and AC to meet the flow requirements through the hose to the large tip. By the time the gasses get to the tip, they will be lower in pressure from the regulator setting. One other note about acetylene is that the rate that it can be "bubbled" out of the cylinder is related to cylinder size. You should NEVER run a rosebud on a small B or MC type cylinder. It cannot produce enough gas volume and can cause the liquid in the cylinder to "foam" out.

I have never had the liquid come out of my acetylene cylinders, but I have had a flashbacks happen. One of those was severe and damaged my torch. If your flame goes out and the torch whistles and is hot on the gas tubes going to the tip. Shut off the O2 immediately. Then shut off the AC. The AC is flammable, but the O2 can cause metal, rubber, and skin to burn violently.






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Discussion Boards > Active Subjects > Messages as Posted > Welding Forum

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