Stud welding on 20ga over 1/4in angle
Stud welding on 20ga over 1/4in angle
(OP)
Hello there,
We are planning to weld some 3/8in stainless steel (SS) Nelson studs onto our trusses, chords made of 2L2x1.5x0.25in; we want to use galvanized sheet metal as stay in place forming for our concrete on top.
The reason to use galvanized sheet metal is for corrosion protection. The sheet metal is only for pouring purposes, I don't want to design as composite cause I don't have enough bonding between metal and concrete, and other reasons.
Any comments on how this could be done achieving full corrosion protection?
Could I by any chance use just black sheet metal and let it rust with time? it is not structural. Would the rust stain the concrete above and surface with time?
We are thinking on coating the trusses with either primer or galvanizing: Will this interact negatively with the stud welding process, or maybe I should use a special procedure (clean surface, etc)? but, having the sheet metal in between stud and truss complicates things, like touch up, no? any ideas?
Never done this before for an exposed to the elements condition, so any help will be really appreciated.
Mixtli
We are planning to weld some 3/8in stainless steel (SS) Nelson studs onto our trusses, chords made of 2L2x1.5x0.25in; we want to use galvanized sheet metal as stay in place forming for our concrete on top.
The reason to use galvanized sheet metal is for corrosion protection. The sheet metal is only for pouring purposes, I don't want to design as composite cause I don't have enough bonding between metal and concrete, and other reasons.
Any comments on how this could be done achieving full corrosion protection?
Could I by any chance use just black sheet metal and let it rust with time? it is not structural. Would the rust stain the concrete above and surface with time?
We are thinking on coating the trusses with either primer or galvanizing: Will this interact negatively with the stud welding process, or maybe I should use a special procedure (clean surface, etc)? but, having the sheet metal in between stud and truss complicates things, like touch up, no? any ideas?
Never done this before for an exposed to the elements condition, so any help will be really appreciated.
Mixtli






RE: Stud welding on 20ga over 1/4in angle
RE: Stud welding on 20ga over 1/4in angle
Generally don't prime composite shear connectors, and are you looking at the concrete being continuous over the joists? Are your joists primed? often don't for interior work. If they are, do not prime top of angles.
Dik
RE: Stud welding on 20ga over 1/4in angle
RE: Stud welding on 20ga over 1/4in angle
With CSA S16 (Clause 17), the stud dia cannot exceed 2.5* the thickness of the angle and can pass through 2 layers of 20ga material (just checked). There are some other requirements. Other codes may be different.
Dik
RE: Stud welding on 20ga over 1/4in angle
And I still am unsure whether you can install stainless studs to carbon steel using the typical methods.
RE: Stud welding on 20ga over 1/4in angle
Dik
RE: Stud welding on 20ga over 1/4in angle
well, it is an aggresive environment since it is on the shore line of Lake Ontario. The metal deck will only used as stay in place form, so no composite action, but it is HDG because of corrosion, don't want the rust to stain the concrete long term. Actually the concrete rebar is GFRP.
The studs are there because we want to fix the concrete to the joists, and we are restricted by cover, and so therefore the need for SS, although I am worried the low cover will allow for concrete consolidation around these studs and the formation of cracks.
We were told by the stud vendor that the galvanizing on the sheet metal is in the way of obtaining decent results (he made some tests) so we may be changing procedure.......
Cheers
M.
RE: Stud welding on 20ga over 1/4in angle
Dik