>> Fishmouths & shear ties are a way to blend stiffness between a box
>> section
>>
>> and a channel... which minimizes stress concentrations... Metal
>
>You just seem to be stating the same thing over and over. I have never used
>anything but plain rectangular plates and they have always met stress
>requirements. I want to read into the theory to see if changing the way I do
>it is worth it.
>
>Steve
>
I have looked and looked for information on the NET about fish mouthed
re-inforcing plates and there isn't much to be had.
Basically you can use a plate cut to form what looks like an open fish
mouth on each end.
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> <
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You can also use a diamond shaped plate to give the same effect.
To weld the frame directly from the top to the bottom makes it likely
to crack again for reasons which I am not qualified to try and
explain. After over 30 years of working as a Millwright, I can say
that once a crack has been welded it quite often cracks there again so
a plate is used to bridge the repaired area and this plate is welded
with stitch-welding so as not to make a continuous weld. This way, if
one stitch was to crack it won't carry over to the next weld. The
fish mouth (or diamond) allows you to place welds that are not in a
direct line from top to bottom.
Since my explanation is wanting, and I am just a DIY repairman, I have
cross posted this message to a welding NG to draw in some expert
opinions for you - and for me :)
--
Gordie
There are tongues speakers who speak in an unknown language that actually
exists among the peoples of the earth. I recall one such incident in which a
tongues speaker got up and spoken in some unknown language. As it
happened, there was a priest in the audience who just happened to speak the
language this women was speaking as an unknown tongue. The priest asked
her if she knew what she was saying. The women had no idea so the priest
told her: "You were speaking my native language and what you were saying
was cursing God."
http://www.saint-mike.org/Apologetics/QA/Answers/Faith_Spirituality/f0404120221.html