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Your correct, now in the video was he welding or brazing? If he'd welding on an already heat treated blade the joint will be weak and prone to breaking, not to mention the heat will ruin the temper on the lower blade. Brazing takes less heat but you still have the problem of ruining the temper.
Now one could conceivably weld one that way before heat treat, forge the weld and it would hold but wouldn't be as strong as having a tang since you risk weld inclusions and defects.
My preference is to silver braze. V notch to tang and threads to increase the surface area. Do it right and you'll be able to bend the threads over without breaking the joint.
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