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Thread: "Drawn" vs. "Seamless" Aluminum

  1. #1
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    Default "Drawn" vs. "Seamless" Aluminum

    2.5" Diameter .065" Wall Thickness 6061-T6 drawn aluminum tube vs. 6061-T6 seamless aluminum. Seamless is nearly three times the cost at www.onlinemetals.com. Would the cheaper (drawn) be ok for mast (Michael Storer "Viola" sailing canoe)?
    Last edited by Bflat; 12-09-2021 at 06:25 PM.

  2. #2
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    Quote Originally Posted by mmd View Post
    Drawn tube is not as strong as extruded (seamless) tube.
    Thanks, mmd. That settles it for me. I'll go with seamless.

  3. #3
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    That's a slightly odd comparison, as all the seamless tube I've met was also "Drawn"....



    https://www.obcorp.com/-/media/amete...ba-seamwld.pdf
    I'd much rather lay in my bunk all freakin day lookin at Youtube videos .

  4. #4
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    Quote Originally Posted by P.I. Stazzer-Newt View Post
    That's a slightly odd comparison, as all the seamless tube I've met was also "Drawn"....



    https://www.obcorp.com/-/media/amete...ba-seamwld.pdf
    I wondered about that too, but that's the wording used by the vendor: www.onlinemetals.com.

  5. #5
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    Seamless tubing has no weld - a solid bar has been forced over a mandrel to make a hollow tube. That tube is then drawn over other mandrels until the desired dimensions are obtained.

    Drawn welded tubing is formed by bending a sheet into a cylinder and then welding the seam. The resulting tube is then drawn over mandrels until the desired dimensions are obtained.
    I will beg you for advice, your reply will be concise, and I will listen very nicely and then go out and do exactly what I want! (Apologies to Lerner and Lowe.)

  6. #6
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    Quote Originally Posted by alkorn View Post
    Seamless tubing has no weld - a solid bar has been forced over a mandrel to make a hollow tube. That tube is then drawn over other mandrels until the desired dimensions are obtained.

    Drawn welded tubing is formed by bending a sheet into a cylinder and then welding the seam. The resulting tube is then drawn over mandrels until the desired dimensions are obtained.
    Would I be correct to assume that seamless tube would be better for a mast? (Storer Sailing Canoe, "Viola" with lug rig).

  7. #7
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    Default Re: "Drawn" vs. "Seamless" Aluminum

    Thank you, Michael!
    For taking the time, I learned something before coffee!
    Brian

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