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Re: Tack Welds

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>I am about to conclude that these welds have no 
>reliable strength Am I missing something?
Your conclusion is correct. ASME Code Rules do no allow incorporation of 
tack welds in vessel seam welds and when they are removed the surface 
must be ground to remove all traces of the tack weld. 

The chief reason is that tack welds are temporary and very few welders 
take much care in laying them down. Small welds are also more susceptible 
to cracking and don't have much in the way of sound weld metal between 
the ends. Tack welds have no reliable shear strength--even a tiny 
imperfection will invalidate any engineering analysis. 

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

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