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Re: Welding Tubes

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Correct me if I am wrong, but the thickest fillet that can be considered
as effective is the thickness of you thinnest element.  So if you have a
1/4" col, the thickest fillet weld that can be used for calculations is
1/4".

Jake Watson, E.I.T.
Salt Lake City, UT



"Kipke, Richard" wrote:
> 
> I am trying to develop the full strength (actually close to the full
> strength - 25.5 ksi)  of a ts14x6x1/4 (Fy=46 ksi) welded  onto another
> tubesteel.  The support tube steel contains internal stiffeners to address
> the deformation of the top flange.
> 
> My problem is weld size.  I would prefer to do this with a simple fillet
> weld.
> 
> to simplify the calculation:
> 
> 1/4" (tube wall size)x25.5 ksi = 6.375 kip/inch
> 6.3752 kip/inch / 21 ksi (E70 electrode)=.30357"
> .30357/.707 = 7/16"
> and I would prefer some extra so 1/2"
> 
>   We have other methods (more intricate) available to make this connection,
> but I would prefer to keep it simple.
> 
> 1.  Is this size weld permissible on a 1/4" wall thickness?
> 
> 2.  Is using a different electrode an option - our fabricator informed us
> that there is a chemistry problem with using an e80 or other electrode.  I'm
> really not familiar with the use of electrodes other than e70.  AISC seems
> to simplify it and does not address any issues of chemistry.  Does this
> sound correct?
> 
> 3. Another option is a full penetration butt weld (probably difficult to
> back, but possible) for which the AISC allows the full strength of the
> material joined to be used.  How is this achieved vs. the fillet weld which
> is limited by the electrode?
> 
> I'm using the ASD AISC.  The answer may be in the Tube steel connection
> design Manual, but someone swiped it from our office (and I think he's in
> Russia right now)
> 
> Thank in advance,
> 
> Rich
> 
> Rich Kipke, PE
> > Structural Engineer
> > Haden inc.
> > 1399 Pacific Drive
> > Auburn Hills MI 48326
> > direct:(248)-475-5144 Fax: (248)-475-5227
> > RKipke(--nospam--at)Haden.com
> >
> >