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  1. #11
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    I would think anyone that can afford $225.000 fishing boat would/should be able to take the boat to a reputable business that specializes in that kind of work. You will need some kind of breathing equipment to clean the tank out.....I don't think a hookah is the proper choice.

  2. #12
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,167

    Default

    Co2? Wow, just wow.

    You are kidding right?

    Hookah? Wow, just wow.

    You never elaborated on the reason for welding. Please do so. Is there a fracture? Corrosion?
    Nothing welded, Nothing gained

    Miller Dynasty700DX
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  3. #13
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,900

    Cool

    I have welded 2,000 gal steel fuel tanks from the inside on tugboats but they were properly cleaned, sniffed and had the hole watches in place. If you should ever need breathing air then something wasn't done right and please don't fill the tank with CO2 and go in a weld. You might not have a next post here...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
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  4. #14
    Join Date
    Mar 2007
    Location
    Carson City, Nevada
    Posts
    32

    Default

    Great, Looks like I have some welders that know what needs to be done. First one week ago when the boat was hauled for bottom paint is seems that the yard guys did not block the bottom right. One block was offset on only one side of the 12" wide flat bottom, rather than spanning the 12" bottom. This was right at the rear bulk head, common with the fuel tank. The crack is very small, 1/2 gal in one week. The tanks are built into the hull on this boat. I still have 500 gal up front. This is an offshore sport Tuna boat and I need all 700 gal. The shipyard are the same guys that also run the aluminum welding at the ship yard. I do not know if they have ever welded on the inside of a tank. There is a 24" access hole for cleaning. The boat is in Coos Bay Oregon. I will supply everything needed. All I need is someone that knows the right way to do this. Any takers.
    Kevin
    [XMT 350MPa , XR Feeder & Aluma Pro gun , Dynasty 200DX]

  5. #15
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,900

    Cool

    Too far away for me...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  6. #16
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,697

    Default

    Sorry to far away for me too.

  7. #17
    Join Date
    Aug 2010
    Location
    Los Angeles
    Posts
    1,167

    Default

    Did any diesel fuel leak into the hull area? Diesel fuel contaminates the **** out of the weld. Although I think the possiblility of combustion is low, I still would be concerned.

    I am not a boat guy but what you describe is a tough one. Do you have any insurance coverage to help expenses? Pictures would certainly help to describe your damage. Can you see the crack? I think if I was to entertain this repair, I would suggest cleaning the gap between the hull and tank, bevel out the crack, seal the area between the hull and tank, purge the area between hull and tank with argon.

    Filling the tank with Argon would be better as Co2 and alum welding is bad. Suppied air respitory gear like a full suit is only way I would send someone in there. 5356 wire and argon cover would be my preference.

    What is the hull material? Any chance of doing the repair from the hull side?
    Nothing welded, Nothing gained

    Miller Dynasty700DX
    3 ea. Miller Dynasty350DX
    Miller Dynasty200DX
    ThermalArc 400 GTSW
    MillerMatic350P
    MillerMatic200 with spoolgun
    MKCobraMig260
    Lincoln SP-170T
    Linde UCC305 (sold 2011)
    Hypertherm 1250
    Hypertherm 800
    PlasmaCam CNC cutter
    Fadal Toolroom CNC Mill
    SiberHegner CNC Mill
    2 ea. Bridgeport
    LeBlond 15" Lathe
    Haberle 18" Cold Saw
    Doringer 14" Cold Saw
    6 foot x 12 foot Mojave granite

  8. #18
    Join Date
    Sep 2006
    Posts
    2

    Default

    http://www.fredwahlmarine.com/index.htmlI would give this man a call. I'm not sure if he builds in aluminum but I would bet he can hook you up with somebody that can help you. The hardest part is going to be getting it clean enough to weld.

  9. #19
    Join Date
    Nov 2006
    Location
    Lake of the Ozarks MO
    Posts
    3,553

    Default

    The hull IS the tank. IOW if you drilled thru the bottom of the boat you would have fuel running out. The bulkheads create the tank sides. Great idea until it fails.
    Whoever set the boat is liable if they can pay.... hopefully with their liability coverage.

    I say clean it, ventilate it and then tig it. Just my opinion.

    www.facebook.com/outbackaluminumwelding
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    SPEEDGLAS 9100XX

  10. #20
    Join Date
    Jun 2009
    Location
    Wyoming
    Posts
    8

    Default

    Have you looked into having a fuel compatible bladder installed in the existing tank?

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