The area beside the weld will be brittle if you just mig weld it ..... and it will crack again beside the weld. Does it need to be able to flex is this spot ? If so, I'd glue a patch to the back of it using a urethane sealer/adhesive. That way it can still flex slightly over the area, without further cracking. I'd re-enforce that welded up crack for sure either way 
seeya
Shane L.
Proper cars--
'92 Range Rover 3.8V8 ... 5spd manual
'85 Series II CX2500 GTi Turbo I :burnrubber:
'63 ID19 x 2 :wheelchair:
'72 DS21 ie 5spd pallas
Modern Junk:
'07 Poogoe 407 HDi 6spd manual :zzz:
'11 Poogoe RCZ HDI 6spd manual
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