Imagine you have a 10GA steel box with a 1" dia hole in the bottom.

You want to plug it to make sure it is watertight.

Now the only patch you have is a large 3/8" thick stainless plate that is much bigger than the hole.

Is there an adhesive/sealant that I could coat the entire interface of the patch with and then do a couple of stringers to hold the patch to the steel box? In this application I have to assume that there will be adhesive in the areas where I am welding.

I do not want to solid weld, nor can I weld on the 1" hole.

I know there are weld through primers, but that doesn't really solve my problem.

EDIT: so i guess my vaugue description above isn't helping me.

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Imagine the square plate is a 10g tank (very low pressure)

Imagine the round flange will be welded onto the tank and used to bolt an apparatus to (with it's own gasket)

I NEED to weld the round flange to the tank. It cannot be bolted or simply glued.…