Rick,
I don't think thermoset plastic can be welded.
How did you fix it Tony, or haven't you done anything to it yet?
Have you called Weber yet? My father dropped a ladder on his Performer about 2 weeks ago and cracked his table. Completely his fault but I had him call Weber anyways. At the worst, they could help him order a new one. Weber Support took his information and his sob story then said to him, "OK, a new table should arrive in about 2-3 weeks." Lucky him, no charge. IMHO, Weber support does a great job. It might be worth at least calling.