[Bruce Lancaster]

I read somewhere that the Model A tank weld (look at one...astounding, and they reached a production peak of nearly 2,000,000 in a year!) was done by "Mercury submerged arc" process...what that means I do not know!
The A was full of really neat automated welds...axle bells, banjo (the earliest banjos were fabricated from channel iron!), those gas tanks, etc.