Axle trouble

Last Saturday I had a ride planned together with a friend. The intend was twofold:

1. I needed to get out of a house refurbishment dip, figured a short ride might clear the head
2. I commute twice a week over a one-way distance of 18km. This is a bit short to get a somewhat healty condition.

So we started out for a ride of 85km. We did not get far though, after 20km or so, my rear wheel was clearly not tracking straight any more. Even worse, it even rubbed the bodywork.  After examination, a weld broke on the rear suspension axle. We did an on-the-road-fix in order to drive Mango130 back home, carefully....