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RE: Steel Deck Diaphragms

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>Arc-spot welds, or puddle welds, are produced by
>striking an arc on the upper sheet, forcing a hole to form, while the lower
>unit is being raised to fusion temperature.
Thanks. Probably not something I'd consider for pressure vessels. ;-> 

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