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Thread: Oxt-acetylene welding, and popping

  1. #1
    Join Date
    Jul 2009
    Posts
    113

    Default Oxt-acetylene welding, and popping

    What will make the torch pop when welding. I get a good puddle going then it will pop, and blow a hole in the thin metal I am welding. If I have a very hot flame it will not pop. With the hot flame it melts the metal too soon, and I have another hole. thanks Stan

  2. #2
    Join Date
    Apr 2007
    Location
    South Texas
    Posts
    759

    Default Popping when welding

    Too big a tip, and too low a flame setting.

    Also getting the tip too hot and the flame flashes inside the tip - see suggestion 1

  3. #3
    Join Date
    Sep 2003
    Location
    Minnestoa
    Posts
    93

    Default

    You may want add flashback arrestor to your torch.

  4. #4
    Join Date
    Dec 2010
    Location
    Ladysmith, British Columbia
    Posts
    25

    Default

    That pop is a backfire; the flame burns back into the tip for a moment. If it backfires and keeps burning in the mixing chamber or further upstream, that's a flashback; worker's compensation board where I am requires flashback arrestors on oxyfuel torches.

    What causes that backfiring? An overheated tip is usually the culprit. A dirty or damaged tip can run hot, as can using the wrong sized tip, wrong gas pressures for your tip, or getting in a tight spot like in a corner where there's a lot of heat reflecting back at the tip. Acetylene welding puts a LOT of heat into the work and with smaller pieces of work sometimes the only solution is to stop and let it cool off.

    Bumping the tip against the work can make it backfire too but that's not so much a setting issue as an operator thing.

    Do you have a tip pressure chart to follow?

  5. #5
    Join Date
    Jan 2011
    Location
    Round Rock, TX
    Posts
    76

    Default

    My old victor would pop constantly. Mainly I was using too big of a torch, and attempting (ha!) to weld thin metal.

    I did break down and bought a Meco. I love it! Most of my welding is down around 0.035" tubing, but used the Meco with a #7 tip to put together my welding table from 1" steel that was 0.100" thick.

    Handy Tip Chart:

    http://bikesmithdesign.com/Welding/Tips.html

  6. #6
    Join Date
    Jan 2011
    Posts
    3

    Default

    I had this problem, and finally someone told me to replace the O-rings in the torch. They were old, and this fixed it. I had some trouble finding replacements, though.

    Good luck

  7. #7
    Join Date
    Mar 2007
    Location
    Central Michigan
    Posts
    178

    Default

    It sounds like you are using too large of a tip. If your current tip is a "1", switch to a "0" and see if that works better for you.

    You should also try cleaning the tip. If the tip is fouled with carbon build up, it can and will behave erratically. If you don't have a set of tip cleaners they are usually less than $5.00 at most welding suppliers and will last a long time if handled carefully.

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