There are two tips to solve this problem:
First tip: Enhance longer length of the shear stud for beyond the ceramic ferrule, that is to say: if the parameter is 3~4mm for normal welding(Supposing the height of deck is 1.2mm), it will be 4.5~5.5mm.
The conclusion: the better length is normal length+height of deck+extra length(around 0.3mm)
Set up a little more welding time(0.2s). 1.7s+0.2s=1.9s
Second tip: Set up a little more welding time(0.2s). If the welding time is 2s for M22*100, the thru-deck welding time will be 2.2s.
The famous company Nelson also gives some important site requirements:
- Top flanges of beams must be unpainted (or at least a strip where the studs are to be welded).
- Remember if fire protection coating is applied to the rest of the beam (top uncoated) prior to stud welding, that touch up may be required after the studs have been welded. (The heat from stud welding may activate the fire protection).
- The beams should be free of heavy rust and mill scale.
- The beams should be free of dirt, sand and other materials.
- Galvanised beams will need to be ground back to remove the galvanizing.
- Water on the deck, or between the beam and deck must be removed before welding.