They had a Dana axle factory the next town over from me and a friend of mine worked there, I got a tour one Saturday.
The spring pads as well as the plug welds at the tube to housing joint were done at room temperature with a MIG welder, didn't seem to be anything fancy.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-