Thamadknotter

Thanks for all of your input and being patient with a newb! I decided to just put what I had together and beat the xxxx out of it to see if I could make it fail, so far so good. From here on out I will follow all of your advice and thanks again!

I just didn't know wether or not the welding would make the spring facing brittle along the edge creating a weak point and delaminate under use. 

The forges in class aren't hot enough to forge weld. What if I were to use some penetrating weld through the faces? What then?

I wanted to make a spring flatter for a class I'm in but I didn't have thick plates of high carbon steel to make the striking plates. I decided to take  two pieces of mild plate steel that were 2"x2"x1/2" and weld four pieces of auto leaf spring pieces that were 2"x2"x1/4" on the top and bottom with a MIG welder,I welded all around the edges essentially making a steel sandwich with the leaf spring as bread and the mild as the meat. What would be the best method of heat treating so that all three of the different metals used in the construction can stay stuck together and survive the hammer blows?