Welding Two Different Thicknesses

[EdK]

I'm going to fire up the welder tomorrow and make sure there's still gas left in the tank and also to get some practice in before Arvid comes and shows me how it's supposed to be done. Anyway, I was wondering if when welding two different thicknesses of metal together you should bevel the edge of the thicker piece? See drawing below.
I'm assuming I should try and aim the MIG wire mostly towards the thicker piece. Is this correct?

Thanks,
Ed