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Very interesting, and wow thats a huge drop in RPM. But, yes, all transmission gears are made of alloy steel and heat treated to take the abuse that they do. Welding will remove that heat treating and weaken the gear. Most of the gearboxes we make at work use a pretty big interference fit. We use liquid nitrogen to freeze the shafts, and we heat the gears up when they get pressed together. On top of that, they have a key in them.
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