How rivited joints are made in air tight?

Riveted joints are made by drilling and deburring the rivet holes. Then hot rivets are driven (the rivet fits loosely into the hole, the driver crushes the hot rivet until it fills the hole tightly) into the holes. As the rivet cools it shrinks in length, tightening the joint (pulls the plates together). Overlapping joints (where one joint overlaps another joint) are scarfed (thinned) to fit together smoothly. After the rivets are cool the edges of the plates, or straps are caulked (upset along the edge) with a caulking chisel, to form an air tight or steam/water tight seal.