weld layout question
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  1. #1
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    Jun 2012
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    weld layout question

    Hello im an ironworker and we do alot of reinforcing and stiffening of bar joists and girders ect. My question is when im given a weld pattern of say 3 on 12 i was under the impression that meant 3 inches of weld for every 12 inches in length or 12 inches on center. Recently i had an inspector tell me that the correct way is 12 inches between each weld. I know its not a big difference but i want to do it correctly. we also had some debate over the same three on 12 pattern but staggered. When reinforcing bar joists we used 3/4 inch round bar on top and bottom chords pushed into the inside heel of the angle. one guy said to weld the first pattern i mentioned above just shift one side of the bar so the welds were off set. another said to put one weld on top side then twelve inches to next weld on opposite side of bar then 12 inches to next on top side , or 24 inches between welds on the same side of the bar. i hope i explained this ok. Any info or references is greatly appreciated.

  2. #2
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    Nov 2005
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    Re: weld layout question

    what is the weld symbol
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  3. #3
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    Re: weld layout question

    What local?
    Disclaimer; "I am just an a$$hole welder, don't take it personally ."

  4. #4
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    Re: weld layout question

    Per my old Lincoln book, an intermittent fillet weld called out as a 3-12 would be 3" of weld, 12" on center.
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  5. #5
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    Jun 2012
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    Re: weld layout question

    to fred s there was no weld symbol there was a picture of what to do with a caption stating the 3 on 12 pattern. it was a fix that came directly from vulcraft.

    to tozzi i work for a non-union company

    to oldendum thats what i thought it was but one of my co-workers was arguing with me

  6. #6
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    May 2007
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    Re: weld layout question

    Generally stitches are laid out from the center of each weld; unless the drawing indicates that they want a staggered pattern, it's safe to say that the stitches they want are directly in line with one-another. If in doubt, ask your supervisor!

    IMO, 3 on 12 is 3" stiches every 12 inches on center (generally); also worth noting is that if a drawing spec'd a 3" on 12" staggered weld with a symbol, it would be 3" on 12" on both sides, with a 6" offset (hence the staggering!), not 3" on 24" as your co-workers would lead you to believe!
    Last edited by mb_welder; 10-05-2012 at 06:41 AM.

  7. #7
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    Re: weld layout question

    ^ this
    Experience is something you get right after you need it

  8. #8
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    Olathe Kansas
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    Re: weld layout question

    Perhaps hes just not a very smart inspector?
    I forgot how to change this.

  9. #9

    Re: weld layout question

    spent the whole lunch break pondering that question and come to this conclusion ...

    if 3" at each end one side
    measure the length center on center
    than divide by 2
    half the length divide by 2 again
    than subtract by 3"
    should have the formula to start a staggard layout on the other side of the strip... after that its a cake walk
    Last edited by m8tty; 10-03-2017 at 04:59 PM. Reason: maybe easier explained

  10. #10
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    Re: weld layout question

    Not sure why it is a hard question- plenty of documentation and instruction on how this lays out.
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  11. #11
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    Re: weld layout question

    Quote Originally Posted by LawsonWeldingLLC View Post
    Perhaps hes just not a very smart inspector?
    that's what i think. 3" of weld every 12" would always be center to center unless specified otherwise in a structural drawing.
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  12. #12
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    Re: weld layout question

    A company who hires Union Ironworkers would have a proper weld detail for you. There would be no guessing involved.
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  13. #13
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    Re: weld layout question

    Quote Originally Posted by LawsonWeldingLLC View Post
    Perhaps hes just not a very smart inspector?
    Those that can, do.
    Those that can't, teach.
    The others have no idea and inspect. Then they tell you it's done wrong...��
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  14. #14
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    Re: weld layout question

    Quote Originally Posted by xryan View Post
    Those that can, do.
    Those that can't, teach.
    The others have no idea and inspect. Then they tell you it's done wrong...��
    We need an AMEN button in this software

  15. #15
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    Re: weld layout question

    Quote Originally Posted by xryan View Post
    Those that can, do.
    Those that can't, teach.
    The others have no idea and inspect. Then they tell you it's done wrong...��
    I can think of several teachers who would disagree with you...

    But I also know several who "can't" and "can't teach"

    I don't know any inspectors, they're on their own...
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  16. #16
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    Re: weld layout question

    Any time a situation involves ratios extra time needs to be taken to reach a real genuine understanding between those that are doing and those that matter. People often say or write things in a way they don't really mean. Phrases like "in", "to", or "on" need clarified with specifics.
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  17. #17
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    Re: weld layout question

    The 3 inch weld and 12 inches center to center is common at least in North America. I saw drawings where it was not center to center. The drawings were marine and from Australia. There was massive confusion on the shop floor. Finally the joints were done with a Buggo continuously and we didn't have to lay out any longer.

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