Or replacing the entire subframe might be path of least resistance instead of making welds that might not hold.... Hell, at good junkyard you could probably walk away with fresh A-frames too.... and they will cut the replacement subframe out in matter of maybe 30 minutes otherwise itsa bolt on part when you go to install it.
Long time ago, i was dealing with broken rear subframe on 114.... the huge wishbone looking thing that holds rear suspension to the unibody. Believe it or not - it was notso difficult to replace. Toughest part was dealing with coil spring compressor.
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