"Hopscotch weld" basically you spot weld and move around the plate until you get enough tacks to be continuous or near so.
Spark/initiate on the heavier plate and melt onto the tin in short burst. Move an inch or so and repeat . around the plate.
That lets the weld cool between hits and will burn through less often. looks like poopsie tho but is strongerr than continuous burn weld due to less brittleness .