Propane cutting torch problems.
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  1. #1
    Join Date
    Apr 2012
    Location
    Asheville, NC.
    Posts
    146

    Propane cutting torch problems.

    I have a oxy / propane setup. The Miller oxy propane medium duty set.

    Problem #1: I ran out of oxy wayyy faster than I think I should have. What should I be running on the gauges?

    #2: Lots of restarts. Seems like about every 6”, it stops cutting. I’ve tried to change my cutting speed and no matter how fast / slow I go this seems to happen.

    Can I get some tips from anyone who uses this and tell me what’s going on?
    Millermatic 211
    PowerPlasma 50s

  2. #2
    Join Date
    Jun 2012
    Location
    Sebeka and Bemidji MN
    Posts
    14,161

    Re: Propane cutting torch problems.

    It's likely your settings. I've used oxy/propane since the 90's and this video is the best description of proper settings I've seen.

    Most of it is safety and stuff, settings and cutting are after.

    Dave J.

    Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~

    Airco 300 - Syncro 350
    Invertec v250-s
    Thermal Arc 161 and 300
    MM210
    Dialarc
    Tried being normal once, didn't take....I think it was a Tuesday.

  3. #3
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    9,131

    Re: Propane cutting torch problems.

    What size cylinders do you have ?
    I know you'll use 2 oxygen to 1 acetylene when used for cutting. This is with the 150 oxygen and the 135 CF acetylene.


    Sent from my iPhone using Tapatalk

  4. #4
    Join Date
    Mar 2018
    Location
    Clovis California
    Posts
    979

    Re: Propane cutting torch problems.

    Check your tip.
    Most propane cutting tips are 2 piece. But mapp gas is also 2 piece this tip does not work on propane.

    Dave


    Quote Originally Posted by 225 View Post
    I have a oxy / propane setup. The Miller oxy propane medium duty set.

    Problem #1: I ran out of oxy wayyy faster than I think I should have. What should I be running on the gauges?

    #2: Lots of restarts. Seems like about every 6”, it stops cutting. I’ve tried to change my cutting speed and no matter how fast / slow I go this seems to happen.

    Can I get some tips from anyone who uses this and tell me what’s going on?
    HF 170 welder
    HF 4x6 band saw
    South Bend 9N
    Mill
    B&D mag drill
    Victor torch

  5. #5
    Join Date
    Apr 2012
    Location
    Asheville, NC.
    Posts
    146

    Re: Propane cutting torch problems.

    I have a 20 lb propane bottle and the medium sized oxy bottle.

    And I’ll check that video out.

    Thanks.
    Millermatic 211
    PowerPlasma 50s

  6. #6
    Join Date
    Mar 2018
    Location
    Clovis California
    Posts
    979

    Re: Propane cutting torch problems.

    You can cut with 5 pound
    bottle.

    Check your tip I know Victor markings if 101 that is ac, if M?? that is mapp gas and N?? is propane or natural gas.
    There are other numbers and letters but less command.

    If you have right tip it will not work right.

    Dave


    Quote Originally Posted by 225 View Post
    I have a 20 lb propane bottle and the medium sized oxy bottle.

    And I’ll check that video out.

    Thanks.
    HF 170 welder
    HF 4x6 band saw
    South Bend 9N
    Mill
    B&D mag drill
    Victor torch

  7. #7
    Join Date
    Aug 2013
    Location
    Hudsons Hope BC
    Posts
    50

    Re: Propane cutting torch problems.

    what size tip are you using?
    what pressure are you using for the o2?
    to be honest I don't really look at the pressure on the gage I just play with it and try to get a 6 to 8 in feather with a nice raspy sound. this often is at a lower pressure than the standard set it to 40 psi advice
    Lincoln 350mp
    miller regency
    miller syncro wave 300

  8. #8
    Join Date
    Mar 2018
    Location
    Clovis California
    Posts
    979

    Re: Propane cutting torch problems.

    Check the tip this one for propane.
    https://www.weldingoutfitter.com/pro...ne-cutting-tip

    Quote Originally Posted by 225 View Post
    I have a oxy / propane setup. The Miller oxy propane medium duty set.

    Problem #1: I ran out of oxy wayyy faster than I think I should have. What should I be running on the gauges?

    #2: Lots of restarts. Seems like about every 6”, it stops cutting. I’ve tried to change my cutting speed and no matter how fast / slow I go this seems to happen.

    Can I get some tips from anyone who uses this and tell me what’s going on?
    HF 170 welder
    HF 4x6 band saw
    South Bend 9N
    Mill
    B&D mag drill
    Victor torch

  9. #9
    Join Date
    Dec 2018
    Posts
    2,437

    Re: Propane cutting torch problems.

    By "stops cutting", do you mean you lose the cut, or the torch quits working?

  10. #10
    Join Date
    Oct 2014
    Posts
    680

    Re: Propane cutting torch problems.

    Quote Originally Posted by smithdoor View Post
    Check the tip this one for propane.
    https://www.weldingoutfitter.com/pro...ne-cutting-tip
    Medium duty uses MC tips.

    https://www.weldingoutfitter.com/pro...ne-cutting-tip\

    A 20 pound propane is going to outlast several 125 cu ft oxy tanks.

  11. #11
    Join Date
    Apr 2010
    Posts
    2,476

    Re: Propane cutting torch problems.


    225


    Quote Originally Posted by 225 View Post
    I have a oxy / propane setup . . . Can I get
    some tips from anyone . . . what’s going on?
    Read the entire link . . . My opinion is # 11 . . .

    https://weldingweb.com/showthread.ph...ht=oxy+propane

    For: the novice, neophyte, beginner - go OA
    or suffer forever . . .

    hth


    Opus

  12. #12
    Join Date
    Apr 2012
    Location
    Asheville, NC.
    Posts
    146

    Re: Propane cutting torch problems.

    I'm out of town, so I can't check what tip I have, but I am ordering the tip that is suggested. Not really sure what psi I'm running on either bottles.

    I just open them enough to get a good feather and a 1/8" blue flame.

    Quote Originally Posted by farmersammm View Post
    By "stops cutting", do you mean you lose the cut, or the torch quits working?
    When I'm cutting, it just loses the cut. Then I have to re-heat and start again.
    Millermatic 211
    PowerPlasma 50s

  13. #13
    Join Date
    Apr 2012
    Location
    Asheville, NC.
    Posts
    146

    Re: Propane cutting torch problems.

    If I keep having fits with it, I'll just switch to OA....
    Millermatic 211
    PowerPlasma 50s

  14. #14
    Join Date
    Jul 2018
    Location
    Cumbria, UK
    Posts
    718

    Re: Propane cutting torch problems.

    stolen straight from Google:

    Propane has a greater stoichiometric oxygen requirement than acetylene; for the maximum flame temperature in oxygen, the ratio of the volume of oxygen to fuel gas are 1.2 to 1 for acetylene and 4.3 to 1 for propane.
    This explains why you absolutely blitz through oxygen. I have small bottles and have the same problem, but you just have to accept it as a fact of life.

    As long as you've got the right size nozzle, pressure and adjustment of flame, then that's just how it be.

    If you're struggling to cut consistently with it, then either your flame is set wrong, or your standoff height is wrong. It's a higher standoff than with O/A, because the preheat energy is in the secondary flame, not the primary.
    Last edited by Munkul; 01-17-2020 at 11:34 AM.

  15. #15
    Join Date
    Mar 2011
    Posts
    170

    Re: Propane cutting torch problems.

    Hi. I switched to Oxy Propane for cutting owing to the high cost of acceytlene here in Canada
    At first I couldn't get it to work right Then Someone showed Me how to set the flame, Holding the torch off
    a piece of metal and adjusting the Oxy until you get the blue star on the metal about 2" wide
    I now find it works Better than Oxy Acc For me I use A Victor 1800C cutting torch and the cutting nozzles
    I buy on e bay Download a copy of the Victor nozzle cutting chart https://www.ebay.ca/itm/2-HPN-Propan...8AAOSwPCVX2Vxs

  16. #16
    Join Date
    Aug 2013
    Location
    Hudsons Hope BC
    Posts
    50

    Re: Propane cutting torch problems.

    you can put me in the prefers propane camp to. I used it for 10 years before I found out there was a tip made for propane.
    I do not believe that propane uses 3 to 4 times as much 02. the cutting stream is the same size so that leaves only the preheat to use more 02.
    if someone could use a portable flow meter ot figure out the difference I would like to know.

    in the propane vs acy argument folks get BTU 's vs temp mixed up
    ot is the BTU 's that heat the metal and propanes temp is more than enough to melt steel.
    Lincoln 350mp
    miller regency
    miller syncro wave 300

  17. #17
    Join Date
    Mar 2018
    Location
    Clovis California
    Posts
    979

    Re: Propane cutting torch problems.

    You want to look at mapp or PROPYLENE type gas.
    I used propane for about 10 years then my gas company had me try mapp or PROPYLENE It is hotter than propane and give better cut. If you machine after cutting it give better machining too. A tank will last a long time.

    The for Victor mapp/PROPYLENE was ??M
    Yes propane for Victor is ??H

    Dave

    Quote Originally Posted by Josey View Post
    Hi. I switched to Oxy Propane for cutting owing to the high cost of acceytlene here in Canada
    At first I couldn't get it to work right Then Someone showed Me how to set the flame, Holding the torch off
    a piece of metal and adjusting the Oxy until you get the blue star on the metal about 2" wide
    I now find it works Better than Oxy Acc For me I use A Victor 1800C cutting torch and the cutting nozzles
    I buy on e bay Download a copy of the Victor nozzle cutting chart https://www.ebay.ca/itm/2-HPN-Propan...8AAOSwPCVX2Vxs
    HF 170 welder
    HF 4x6 band saw
    South Bend 9N
    Mill
    B&D mag drill
    Victor torch

  18. #18
    Join Date
    Mar 2011
    Posts
    170

    Re: Propane cutting torch problems.

    The same Victor Tips work for both.

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