metal decking installation

huangyhg

metal decking installation
anyone out there have experience with using powder-actuated mechanical fasteners for installing metal decking to steel joists.  are there any inherent disadvantages to this type of fastening system in lieu of the traditional puddle-welding method?
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you can fasten steel deck to joist or any steel member via various means such as:
1.    puddle welds
2.    mechanical fasteners (i.e. tek screws)
3.    powder driven fasteners (similar to those hilti and others make)
each of these systems has the good and bad. welding is great and will have large shear capacity, if welded properly. since welding is done on roof tops and is done by bending down and due to the thin nature of the deck, you will tend to have burn through and misalignment of the weld and the supporting steel   
hilti's "direct fastening" system is the only one i'm aware of.  it's quite a simple way to install floor plate.
you must ensure that the surface treatment on the beam, where the stud penetrates the underside of the top flange, is touched up to avoid future corrosion problems.
oops, i thought you were referring to floor plate when it seems that you are in fact referring to light-gauge decking for composite slabs and formwork...sorry.