Wrought Iron

I have wrought iron outdoor chairs, the slats are aluminium, my problem is that the slats have snapped off.?
I brought a soldering iron and solder and tried to fix the problem but its only bonding to wrought iron is there something I am missing or another solution to fixing, apart from throwing all 6 away.
A strange combination of materials at best???
Answer stating WELDING (not soldering) alum. to wrought is correct. The compatability is nil.
If by now, aesthetics aren’t a major concern, and your budget sense says keep the chairs I think answer stating screws is likely how you have to go.
You say “Slats” as opposed to tubular aluminum, but no matter. You might reposition the slats appropriately; even clamp them in place; drill small pilot holes allowing for a STAINLESS STEEL screw, and re-attach the slats to the wrought.
With all due respect, if they were mine, I’d probably start saving funds to buy new. I have all alum. outdoor chairs, and the only issue with them is an occassional paint touch up.
Steven Wolf
www.aceiron.com – Hand-Forging a Large Wrought Iron Chandelier