Originally Posted by IMHO
Originally Posted by M3W55
IMHO

One of my (late-2016) lower wishbone bracket bushes failed a couple of years ago, taking me into a tree! A couple of fabricators have suspected weakness in the HAZ, but I have not heard of other instances.


Scary. I guess the one advantage of a timely bolt in frame is that there’s no HAZ.

Has anyone had an in situ frame modified by welding e.g wishbone brackets?

My experience is that every chassis crack I have seen (I have only seen lower ones by the wishbone attachment) Starts in the heat affected zone (HAZ) and propagates round the tube from there. The stresses in this welded area are enormous.

2013 M3W 1960 Velocette Venom and the Landrovardo!