The chain can be welded and still run through a gypsy.
The welder needs only to be careful and not leave alot of bead or a sloppy weld. The inside of the link can be
cleaned as well. If properly welded the link will be stronger than the chain.
I have the same concerns as I have intentions of joining two lengths of chain for my anchor. The results I have
found on my own research are as above.