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When is a fillet necessary?

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  • When is a fillet necessary?

    I'm trying to plan out my first welding project - a bird feeder rack - and I'm a bit confused as to where I'm supposed to put a fillet, or if I even need one for this application as it isnt really going to have a huge amount of weight applied to it.

    Basically, the design is made from 1.25^2 1/8 box tubing. The mast will be about 8ft tall with four 18" or so hanging arms coming off of it at 90 deg for thistle seed bags and suet cages, with a larger seed feeder perched on the top.

    Would these hanging arms require the use of a fillet? Or could I just butt weld it right to the mast tube?

    Any thoughts, opinions, suggestions would be appreciated. Thanks for your time.

    -SS
    Millermatic DVI MIG
    Spectrum X-treme 375 PC

    Green, but eager...

  • #2
    What is a "fillet" weld

    What is your understanding of the term fillet or a fillet weld?

    To me it is any weld applied to the intersection of two members perpendicular (sp) to each other.
    So in your box tubing joint you would have two fillets and "butt joints".
    I would weld all around the tube if for no other reason than to keep water out.


    http://www.unified-eng.com/scitech/weld/weld.html
    this site might help


    Hope that helps


    TJ
    Last edited by Fat-Fab.com; 01-22-2007, 01:35 PM. Reason: added site address
    TJ______________________________________

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    • #3
      Originally posted by Fat-Fab.com View Post
      What is your understanding of the term fillet or a fillet weld?

      To me it is any weld applied to the intersection of two members perpendicular (sp) to each other.
      So in your box tubing joint you would have two fillets and "butt joints".
      I would weld all around the tube if for no other reason than to keep water out.


      http://www.unified-eng.com/scitech/weld/weld.html
      this site might help


      Hope that helps


      TJ
      It helped alot! Thanks!

      I think I was confusing my terms. By "fillet" I guess I was meaning the joint, where in my case, envisioned cutting all the members with 2 45 deg cuts and welding them together. The weld would look like an "X". It was easy enough to understand in 2D but with adding two additional members on the same plane (coming out from the X and away from it) my head started to hurt with all the angles.

      From the resource you provided, it sounds perfectly acceptable and structurally sound to just "butt joint" it to the tube with a "fillet weld" around the entire joint.

      Thanks for clearing up my mental malfunction.

      -SS
      Last edited by ShootStraight; 01-22-2007, 05:26 PM.
      Millermatic DVI MIG
      Spectrum X-treme 375 PC

      Green, but eager...

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      • #4
        Glad I could help

        TJ
        TJ______________________________________

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        • #5
          Fillet

          SS- you may want to add a gusset( or brace) to the arms, depending on how heavy the bags are, especially if the wind blow in your area.

          RG
          Miller Big Window Elite helmet
          SP-175Plus 220V MIG
          GE 180 amp "buzzbox" (Learned on it in high school!)
          Lotsa tools, hand, power and specialty
          +25 year ASE Master Auto Tech/L1/Truck

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