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Welding of studs through deck to steel beams
- To: seaint(--nospam--at)seaint.org
- Subject: Welding of studs through deck to steel beams
- From: Michael Hemstad <mhemstad(--nospam--at)mbjeng.com>
- Date: Fri, 01 Feb 2008 10:21:25 -0600
We have a project using exposed steel beams under acoustic
composite metal deck. This is normal composite metal deck, with a flat
perforated sheet of steel spot welded to the bottom of the deck. Batts of
insulation are then stuffed into the resulting cells. I believe the
perforated plate is painted before assemble.
When shear studs are then welded through the deck to the
beams, they have to pass through two plies of steel. Two questions
AWS D1.1, section 7.4.2, forbids paint on the top flange
of the beam. I am concerned about the possibility of rainwater wicking
between the deck and beam, rust blush forming on the beam flange, and
then weeping down onto the beam, either requiring re-cleaning before painting or
staining the paint after it is applied. If two layers of metal deck, at
least one of which is painted, don't compromise the stud weld, does a coat
of shop prime on the beam flange?
Second question: D1.1 section 7.2.7 forbids welding
through more than two plies of deck. Obviously, they will try to butt the
deck sections where they can, but I am guessing there will be places where
they will want to overlap sections of panel along their edges. With our
acoustic deck, I assume this means that at overlaps they have to cut or punch a
hole in the top section of deck. Since this will be a fight with the
contractor, I would appreciate confirmation or thoughts on this.