Grinding Down Welds

I spent tonight grinding down the welds from last night. The majority of the time was spent on the battery tray area. I'm not as concerned about the fenderwell welds as they can't be made to look perfect and are covered by the fender.

I used a grinding disc with a 4" 50 grit pad. The work took a little while but the battery tray panel is smooth enough to use USC Metal Filler to complete. I've included a few pictures below. I would like to have a picture of each before grinding but we used the grinder while welding to find any gaps in the welds. The pictures below were taken at the midpoint of the process.