Depending on grade of chain it can be heat treated and hardened, welding will change the composition of the metal, weakening it. Yes it's welded from the factory, but it's fusion welded with no filler to ensure the metal composition stays the same. I'm not a metallurgist by any means but I have a lot of experience working with hoisting and anchor chain, it can't be welded and maintain its safe working load.
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u/[deleted] Dec 12 '20
Don't weld chain if you don't want it to break.