Wooden ikea outdoor chairs (Ecclesfield S35)

Around 4 years old. There’s 5 chairs in total; 2 corner pieces and 3 straight. Can be arranged however you want. They’re designed to have large cushions in them. They need treating. 3 are faulty, 1 has all the slats come out and the other 2 have just a few slats broken on one side. They seem to go weak on the underside of the frame, the slat pieces are fine. I think they could be repaired quite easily by just reinforcing the underside of the frame where the slats sit on. Will be left on the driveway to be collected whenever you want.