Hey Steve, welcome to the forum by the way.
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I'm not sure the welding bit is such a good idea.
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I believe I'm right in saying you'll need a cat to be present for the MOT test on post
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'93 cars
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(I'm sure somebody else will be along in a bit to confirm the exact cut off point for you.
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it could be mid
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'94).
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Options are to de-cat with a proper decat pipe so you can switch a cat back in come test time or simply buy a new cat and fit that to avoid the messing about.
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Of course if your car doesn't need the cat for it's MOT the welding idea could work OK I guess.
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Not sure how it would sound though but no reason to think it would be that much different to the decat pipe option really.
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Give it some time and I'm sure someone with experience of it will be along.
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R