1990 Subaru Legacy welding new timing gear to crankshaft

I have a ej22 subaru motor 1990. My crankshaft has been wallered out by a loose crankshaft bolt where the gear and pulley were rubbing on the crankshaft. Ihave replaced the timing gear and crankshaft pulley along with a new keyway. My question is this, Can I mig weld the end of the crankshaft to make up for the loss then put timing gear with key way then pulley on. Will this work? I am aware of the front seal when welding and will use precaution.