Hi Stephen,
it would very unusual to have the guard 'welded' to the blade.
It might be a very tight 'interference' fit. The aperature through the guard (for the blade) is made to an almost perfect 'fit' ....but 'fractionally' smaller (read 'miniscule') .The guard is heated to red ....the metal expands very slightly (making the 'hole' larger) allowing the guard to be positioned on the blade.....as the guard cools ..it effectively shrinks tight to the blade. Over time, corrosion and electrolytic action would eventually "rust weld" them together.
Regards David
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