The rusty seam needs to be repaired.
I first use a body saw to cut the flange free from the rest of the wheel well and I use a 3/8” drill to drill out the spot welds.
Using a metal stretcher I form a flat piece of steel to match the radius of the wheel arch
A shot from the back.
I then stitch weld the panel into place. I am left handed so I start from the second spot on the right and run a bead to the next spot on the right. I then skip back to the next spot on the left and run a bead back to the right to join up to the last bead.
Next I make up the flange for the wheel tub and attach it with some self taping screws.
I first tig weld the flange using the same method as before to the tub and then spot weld the flange to the panel using a mig welder.
I fixed up the corer of the panel and the welds have been ground smooth and a quick coat of primer applied.