wrought iron and alum,are actually not really compatable to begin with as far as welding goes.if theres enough on your wrought you'd be better off drilling through and using nuts and bolts,.nowadays most wrought is strictly junk.

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

Because of the difference in materials soldering is not an option. I think your best bet is an epoxy made for metalic applications.

take it to a welder to fix this