Aluminum alloy

Discussion in 'Boat Yard Basics' started by firecat1981, Oct 3, 2013.

  1. firecat1981

    firecat1981 BBA Counselor

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    I'm thinking of buying a TIG set up and making some parts for my next boat. Does anyone know if I need a specific alloy, or does it really matter?

    I've made some trolling motor mounts, a jack plate, and a few small support parts in the past and I've never had any issues even though I didn't know what alloy it was because it was all scrap. So I'm not really sure it matters too much. Also does it matter from a polishing perspective?
     
  2. whm302

    whm302 I Love microskiff.com!

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    6061-T4/T6 is one of the most common used structural grade aluminum alloys with good weldability and corrosion resistant...
     

  3. firecat1981

    firecat1981 BBA Counselor

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    I think 6061 would be the easiest to get, but I saw on another discussion that 5356 is considered marine grade, and that 6063 is used by others. I've never had anything made of aluminum ever start corroding, has anyone else?
     
  4. whm302

    whm302 I Love microskiff.com!

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    salt water corrosion usually isn't the issue as much galvanic corrosion (corrosion of dissimilar metals).. you see a lot of this on alum. welded boats where someone mounts say a trolling motor with steel bolts without sometype of barrier between alum and steel and then fishes saltwater.. and not to mention when current is added to the equation the corrosion is sped up that much faster...see a lot of it around ground wires on trailers and such screwed in with two dissimilar metals.
     
  5. firecat1981

    firecat1981 BBA Counselor

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    Thanks that's what I was thinking.