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  1. #1

    Default Stainless repair on sailboat (underwater)

    Hiya,
    First post here. Just got my Miller mig after 20 years of waiting, and I've got to repair my little darlin'. Thought I'd ask here about it.

    So, the bottom shackle on my rudder is apparently weathered and busted apart. I don't have the money to buy new parts, so I'm gonna weld her up myself. I'll be welding stainless, and as soon as I'm done with it she's going back in the water. What kind of gas/wire combo should I use in order to retain the best possible corrosion qualities for salt water immersion?

    Thanks in advance!

  2. #2
    Join Date
    Jan 2007
    Location
    Delmont, PA
    Posts
    290

    Default

    Hey pucket,
    You really need to describe, with pics, the part to get good repair suggestions.

    1) What is the power output of your welder?

    2) What is the thickness of the repair part.....solid or hollow?

    3) Is it steel or a casting?

    Your weld area has to be clean & bare. Beveling if necessary to insure a good bond & strength. Wire could be 309/309L or 312 or possibly 316 for optimum corrosion resistance. Gas mix would probably work well with Ar/CO2 not more than 5% CO2. I use 98/2 generally with superb results. Member SundownIII has a lot of experience with boats & marine welding & I'm sure he will offer your best options for success..... give us as much info as possible.

    Denny
    * Complete welding, machine, & fab shop *
    * Mobile unit *
    * Finally retired *
    ____________________________________________

    * A man's word is his honor..... without honor, there is nothing. *
    * Words are like bullets..... once they leave your muzzle, you cannot get them back. *
    * I have no reservation to kill nor hesitation to die for the U.S. Constitution & the American Flag. *
    * Age is a state of mind..... at my age, you cannot fathom what is in my mind. *

  3. #3

    Default

    Aargh. I won't know the exact nature of the repair until I pull her out of the water. And, unfortunately, I will have a limited amount of time to have the proper materials available and do the repair. Can't afford dry storage for more than a day or so. I apologize for being vague, but that's all I've got.

  4. #4
    Join Date
    Oct 2005
    Location
    phoenix
    Posts
    5

    Default

    I do not think Yorkie caught that you were welding stainless, you need a trimix gas, helium, argon, co2. Other than that I cant tell you to much without knowing thickness and all of that.

  5. #5
    Join Date
    Feb 2009
    Location
    Lodi, CA
    Posts
    1,223

    Default

    I'm pretty sure yorkie caught the stainless thing, all the alloys he mentioned are stainless. The gas mixes he specified, are also commonly used for stainless.
    Obviously, I'm just a hack-artist, you shouldn't be listening to anything I say .....

  6. #6
    Join Date
    Jan 2007
    Location
    Delmont, PA
    Posts
    290

    Default

    Hey noboxus,
    You apparently did not follow the order of my response as to suggested procedure. Quote: "I do not think"....... correct, you did not think. Quote: "you need a trimix gas"...... that is incorrect. There are very few applications that a tri-mix is needed or required..... a waste of money. Also, SS can be forged or cast just as carbon steel. The OP's indication that he is "welding stainless", also did not clarify if the part he is going to weld is stainless, or he was going to use a SS filler for the repair w/SS wire, thus his comment of "welding stainless" was not entirely clear.

    To you & all others, especially the newbies/youngsters learning stainless, who really need to do some homework on gasses, here's the site that will enlighten you regarding gasses, fillers, & applications that are proven & work extremely well. The information from Ed Craig is from years of experience & the science of metal & metal fusion.

    Denny

    http://www.weldreality.com/MIG_welding_gases.htm
    * Complete welding, machine, & fab shop *
    * Mobile unit *
    * Finally retired *
    ____________________________________________

    * A man's word is his honor..... without honor, there is nothing. *
    * Words are like bullets..... once they leave your muzzle, you cannot get them back. *
    * I have no reservation to kill nor hesitation to die for the U.S. Constitution & the American Flag. *
    * Age is a state of mind..... at my age, you cannot fathom what is in my mind. *

  7. #7
    Join Date
    Oct 2005
    Location
    phoenix
    Posts
    5

    Smile

    Quote Originally Posted by JSFAB View Post
    I'm pretty sure yorkie caught the stainless thing, all the alloys he mentioned are stainless. The gas mixes he specified, are also commonly used for stainless.
    actually that gas combo is never used for stainless if you have any real background with stainless. 98% argon 2% O2 and trimix are the only gases to be used on stainless and you better be on top of your welding game if you go with 98/2. If he is new to welding stainless it is very smart to use trimix as it gives much better results and is more forgiving.

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