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clubman
I saw the tube joints and my first thought was that it looked like it had been [I think it’s called] resistance welded, but I didn’t think they had the capability to do it in the 50s. As @midlife correctly pointed out, it was a technique perfected and used by Peugeot in the 70s. Perhaps in the 50s the method was too much in its infancy hence the failures.
I don’t know how they do it. The energy release must be enormous, so they must use some kind of capacitor bank to store the energy before bringing the parts together. That would have been quite a difficult thing to do in the 1950s!