Stud welding over galvanized 20ga on 1/4in thick angle.

[Mixtli]

Hello there,
We are planning to weld some 3/8in stainless steel (SS) Nelson studs onto our trusses, chords made of 2L2x1.5x0.25in, the thing is that 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

 

[Ron]

First of all, I would not use stainless steel Nelson studs. Use mild steel. Keep the galvanizing on the decking. You can coat the trusses with primer, but I wouldn't galvanize. Paint everything after concrete placement.

 

[mk3223]

The fume from the welding of the galvanized steel is a inhalation hazard to person. First to make the parts from the black steel, and then galvanize or paint.

 

[dik]

If not composite, why headed studs? If the trusses are interior, is it necessary to provide a coating. Why are you concerned about corrosion?

Can you provide a sketch?

Dik