system
Given the following post, respond as if you're commenting on Reddit:
human
How do we make the thick sheets of armor for tanks and warships?

So I was just wondering, the composite armor that we use for tanks and the battleships of old are extremely thick and hard, so how do we shape/mold them? 

How do we fashion this extremely hard and durable materials into the specific shape of a tank or the hull of a ship and how do we get various different sections of the hull to join together? 

I'm assuming that welding doesn't work due to just how strong the materials are.
gpt
Large sheets of steel, like in old school ship armor, are generally hot rolled and then cut into shape by a number of processes. Either rivets or welds can join the plates. 

Modern tanks are different, with composite armor. That's made of several types of ceramic, metal and polymer and there's so many types that all are assembled differently.