Sorry, thought i said what it was. Its the hole were a subframe bush presses into. Got it from scrapyard. Subframe Looks ok, but this bit. Would never have seen this if I hadn't cut out the old bushes. Approx 100m in diameter and looks like a separate piece that is welded to the subframe.
Was planning on getting frame dipped but for this set back.
When the subframe is positioned on the vehicle, is the area around this bush at a low point? It looks like water has pooled inside the subframe and caused this rot. It may have rusted and weakened from the inside out in other places too.
Although you have now removed the bushes, could you still return it to the scrapyard for a refund or a better one?
Would try and get another frame, but they are like hens teeth. Had to get this one shipped to me. What you see in picture would not be visible on inspection without removing bush.
if its a straight round bush, can you get a piece of tube the right size and weld a couple of large "washers" over the ends, a bit like I did when mounting for the bush in the rear axle of my car had rusted though (before I welded them together.
I've done similar to @optima21 before and never had a problem with the mot (in NI)
Having said that the welding looked OK and was certainly as good as what was originally done. (think I stick welded it)
Sometimes you have to make do, but I wouldn't be happy if I paid for that lump of scrap.
Making sure you maintain the suspension geometry is the biggest issue.
Don't laugh!! Its a Rodius. Unfortunately got it 6 months ago and don't have much come back coz of that. But will try. Going to see if I can get a cup holder off another frame and weld in. It was just a wee project I thought I would have a crack at, but starting to think maybe not the best motor to throw money at..