Cutting torch pressure

[Kenskip1]

OK,so I would like to know what the pressure should be, from the regulator to the tip, not in the bottle, for oxy acetylene cutting torch.Both oxygen and acetylene. Thanks, Ken

[Weld_]

It's going to depend on a few other variables. Usually these parameters are specified in your literature associated with your equipment. Having said that you can get away with 6 on the acetylene and 35 on the cutting with most equipment. But that doesn't mean you're not going to wreck havoc on sheet metal using a much larger tip designed for heavy plate. Best place for this information is in the owners manual with your equipment.

[Louie1961]

acetylene pressure should never approach or exceed 15 psi on the secondary gauge. Other than that, it is really dependent on the size of the cutting tip and the mfg recommendations. As a ballpark, a victor size 1 cutting tip (good for steel up to 3/4 inch) needs 30-35 on the oxygen, and 3-5 on the acetylene, per the mfg.

[Kenskip1]

What I have is a 2003 F150 exhaust manifold (passenger side) leaking. I need to cut the nuts off the studs so I can remove the manifold, then I can work on the studs.The nuts are very badly rusted. Wish me luck.

[kize]

Didnt you purchase a Lotos plasma cutter ? I would use that- job would be done before you got the cutting torch hooked up.

[ljdm]

What I have is a 2003 F150 exhaust manifold (passenger side) leaking. I need to cut the nuts off the studs so I can remove the manifold, then I can work on the studs.The nuts are very badly rusted. Wish me luck.

I have the same year truck, same side cracked. Been trying to run the stereo a little louder these days, LOL. Really dreading this repair, estimate from a shop is $750 - 1000.

[Kenskip1]

Didnt you purchase a Lotos plasma cutter ? I would use that- job would be done before you got the cutting torch hooked up.

Yes I did. And yes it is still working well. However I feel that I would have more control over the flame. BTW, I never thought of this until you mentioned it. However I just want to cut through the top of the nut and chisel the nut off, leaving the stud. Eric at South Main Auto has a video on this. Thanks for the suggestion, Ken

[Munkul]

Handy chart by ESAB

https://www.rapidwelding.com/files/PNM-NOZ.pdf

[Mcm308]

I usually set my gauges to 7 on the acetylene and 40 on oxygen.

[docwelder]

for burning i kept my regs at 40oxy/10acet.

[Sberry]

Turn the O down some and see how much it takes. a 1 tip, clean will cut 1/2 at about 25, just enough to go thru. 3/8 here about 22#

[Go1lum]

oxygen 25, acet 5. Just decent ball park figures to get started. Then adjust from there as needed.

[Kenskip1]

Last knight I set Oxygen at 20 psi and Acetylene at 7 psi. It took a bit to warm the plate but when red I hit the lever. Holy Kow!This thing really works.I had a lot of sparks hitting the floor. Is this normal? Anyway I broke the ice. Yes a poor metaphor but I am still learning. Thanks for the suggestions, Ken

[Louie1961]

Sparks are normal. The torch works by actually burning the metal. There's a trick some folks do where once they start the cut, they actually turn off the acetylene, and if you are careful you can keep cutting with just the jet of oxygen. The different size cutting tips allow for different size jets of oxygen and just enough pre heat to start the reaction without creating too much dross/slag

[rhunt]

Sberry, that's a mighty steady hand you got! Bob

[Dobermann]

Probably too late now but I've found that virtually any nut, regardless of how rusted it is, will come off if it's been heated to a bright red-hot. No need to risk damaging the threads on the studs with a cutting torch!

[Stick-man]

I run oxy/propane at 10&30 for under 1/2" material, and 10&40 for 1/2" and heavier material.

[CAVEMANN]

Probably too late now but I've found that virtually any nut, regardless of how rusted it is, will come off if it's been heated to a bright red-hot. No need to risk damaging the threads on the studs with a cutting torch!

If one heating doesn't do the job, then let it cool and heat it again.

[paul. m]

Well like the guys above have said 40/10 oxy/ acet is always what i used the past 30 + years. Just heating the nut will probably due , if not just wash the nut off the stud , NO cutting . Then you can run a thread chaser after you remove the manifold and you will be good to go . Good luck and GOD BLESS