We can definitely apply pressure to the pieces that are being welded. rdnelson said he's got a few 3' and 4' clamps which we can use. In my mind, that will be the first step - leaving the pieces clamped for a bit. Then, after it sets, if it's not sturdy or shows signs of weakness, we'll apply the patch... or maybe we'll just do the patch anyway - need to see how it looks.