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I've welded mine and a few others on the car.. if
you can get to the crack you can weld it if you know
how to tig.. what I do is pull 1 pan bolt and mount
a grounding tab on that bolt so the ground is right
there, you dont want the ground going into the engine
(like if you were to use something farther away..
it COULD hurt something) but it wont with the ground
on the pan

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Luck has been on your side...I know of more that one instance where Valve covers/Pans have been ballooned when trying something similar
Pull the pan off the engine and clean the area to be welded and weld it up better safe than sorry