Wood Burning Stove Repair
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  1. #1
    Join Date
    Jul 2011
    Location
    Long Island, Socialist Republic of NY
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    2,844

    Wood Burning Stove Repair

    Thera a nice stove on CL for $100 near me. It's cast iron, and has a longitudinal crack across the back. I was thinking of these ways of repairing:

    Lighting and keeping a fire going in it so it preheats and cools slowly and then,

    Brazing w brass (don't know if that will hold up to the continuous heat)

    Welding with Nickel rod, but I'm unsure if this is a tig filler rod or a stick rod.

    Thanks
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  2. #2
    Join Date
    Jan 2011
    Location
    Pensacola, FL
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    433

    Re: Wood Burning Stove Repair

    I'd use Ni99 rods. I get them as stick rods and knock the flux off for using them with TIG. A small fire may do a good job for preheat along with a good job of cleaning out the crack. offer the guy $50 and see if he'll bite

  3. #3
    Join Date
    Nov 2011
    Posts
    448

    Re: Wood Burning Stove Repair

    What Timberwolf said... $50 because a welding repair may or may not work, and you'll spend at least 20 bucks on Ni99 stick electrodes (last time I checked, they ran about $60 per pound). It would kind of suck to part ways with a Benjamin only to end up with a heavy object for the scrapyard.

    Try to groove out that crack as much as possible, and I vote for the Ni99 rod.

  4. #4
    Join Date
    Apr 2011
    Posts
    256

    Re: Wood Burning Stove Repair

    Grind a slight groove in the crack, drill a small hole at each end of the crack to keep it from spreading due to expansion & contraction, knock the flux off a stick of Ni rod & tig it up.

  5. #5
    Join Date
    Jul 2011
    Location
    Bossier Parish La.
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    2,694

    Re: Wood Burning Stove Repair

    Quote Originally Posted by BCTimberwolf View Post
    I'd use Ni99 rods. I get them as stick rods and knock the flux off for using them with TIG. A small fire may do a good job for preheat along with a good job of cleaning out the crack. offer the guy $50 and see if he'll bite
    Would this work using the Ni99 stick rods as stick rods with the flux on as intended? I ask because I have a cast iron heater with a crack, but don't have TIG capability. But I do have a Bobcat to stick rod weld it, or would a O/A torch be the way to go with this rod and no flux? The crack is on the side and I can get the side glowing red hot with a good enough fire, then let it slowly burn out for cool down.

  6. #6
    Join Date
    Nov 2011
    Posts
    448

    Re: Wood Burning Stove Repair

    Quote Originally Posted by Old Skool View Post
    Grind a slight groove in the crack, drill a small hole at each end of the crack to keep it from spreading due to expansion & contraction, knock the flux off a stick of Ni rod & tig it up.
    I thought nickel tig rod was less than Ni99 SMAW rods... could be wrong.

  7. #7
    Join Date
    Oct 2007
    Location
    Yuba City, CA
    Posts
    1,526

    Re: Wood Burning Stove Repair

    CI stoves (and exhaust manifolds) showing cracking, may also exhibit an expanded, grainy looking surface from long term heat, oxidation, etc.
    This skin may be 1/4 of the parent thickness.
    I called this 'cooked'.
    With cooked CI.....even grinding the skin away, doing a bevel groove
    weld/braze with good prep, preheat, etc.......just may not work in the
    short or long term. When cast gets really cooked--it isn't CI anymore
    and is not weldable. The remaining 'good looking' CI exposed by
    grinding, just may not be 'good-enough' for a lasting repair.

    Additionally--you're describing a crack spanning apparently a large
    section. Large sections are 'restrained' at the edges by the cast design
    and/or simply their proportionately large size.....
    ....So What?......the resulting heating of the welded crack, followed
    by cooling, is setting the stage for more cracking--often despite
    one's best efforts.

    All in all--unless a detailed inspection as to 'why?' the crack,
    a big crack in a wood stove is pass.
    Blackbird

    Fat Bastard for President-2016

  8. #8
    Join Date
    Dec 2007
    Location
    Western PA
    Posts
    1,254

    Re: Wood Burning Stove Repair

    Scrap is around $10/hundred around here, last I checked. I wouldn't give more than scrap value.

  9. #9
    Join Date
    Feb 2007
    Location
    West By Golly Shelby NY
    Posts
    7,265

    Re: Wood Burning Stove Repair

    Tough one to fix. Hot and cold will eventually crack it again some place else.

    David
    Real world weldin.

    When I grow up I want to be a tig weldor.

  10. #10
    Join Date
    Jun 2010
    Posts
    99

    Re: Wood Burning Stove Repair

    I would recommend Dave Powelson advice.

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