c.
Undersides of shelves shall have a ground finish of No. 90 grit or
finer.
3.2.2
Fastening Devices
Fastening devices shall be of the same material as the metal being joined
when joint pieces are of similar metal. Fastening devices shall be
stainless steel when stainless steel is joined to dissimilar metal. Stud
bolts shall be a minimum of M6 1/4-20 stainless steel with length necessary
to accept washers, and required nuts, and shall be welded 225 mm 9 inches
on center maximum. Exposed surfaces of equipment shall be free of bolts,
screws, and rivet heads. Stainless steel stud bolts shall be used to
fasten tops of counters or tables to angle framing and trim to other
surfaces. Such bolts shall be of the concealed type. Threads of stud
bolts which are on the inside of fixtures and are either visible or might
come in contact with a wiping cloth, shall be capped with chrome plated
washers, lock washers, and chromium-plated brass cap nuts. Wherever bolts
are welded to the underside of trim or tops, the reverse side of the welds
shall be finished uniform with the adjoining surface of the trim or the
top. Dimples at these points will not be acceptable.
3.2.3
Welding
3.2.3.1
Welding Rods
Welding shall be done with welding rods of the same composition as the
sheets or parts welded.
3.2.3.2
Weld Quality
Welds shall be strong and ductile. Welds shall be free of imperfections
such as pits, runs, spatter, cracks, low spots, voids, and shall be
finished to have the same color as the adjoining surfaces. Butt welds made
by welding straps under seams, or by filling in with solder, or by grinding
will not be acceptable. Welded joints shall be homogeneous with the sheet
metal. Spot welding shall not be substituted for continuous welding.
Joints in tops of counters, tables, drainboards, exposed shelving, and
sinks shall be joined by heli-arc welding or a process other than
carbon-arc welding or one that will permit carbon pick-up. Joints shall be
fully welded. Counter tops shall be factory welded into lengths as long as
practical in order to reduce field welded joints to a minimum. Exposed
welds shall be ground smooth, flush with adjacent surface and free of burrs
and sharp edges. Wherever welds occur on nonfood contact surfaces not
suitable for grinding or polishing, such welds and the accompanying
discoloration shall be sandblasted and coated in the factory with a
nontoxic metallic-base paint. Bolts and screws shall be welded by a
process that will minimize the possibility of carbide precipitation. Welds
in galvanized steel made after galvanizing, and the adjacent areas where
galvanizing is damaged, shall be cleaned and coated with galvanizing repair
compound.
3.2.4
Soldering
Soldering shall serve only as a filler to prevent leakage and shall be made
with solder material. Stainless steel requiring soldering shall first be
cleaned of discoloration and then have a soldering flux applied. Excess or
remaining flux and catalytic material shall be removed after the soldering
has been completed, and the entire soldered joint and adjacent metallic
SECTION 11400A
Page 41
Previous Page
