Are you heating and bending/ stretching?
Or cutting and welding?

I have cut and welded 2 axles, with over 10,000 miles on each, still used as trucks hauling stuff, and no signs of trouble.

Check the picture link below, and the ford axle folder for the most recent info.

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
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-