Methods of riveting:

There are 2 types of riveting methods: Cold riveting & Hot riveting

First the plates are punched and reamed or drilled. The size of the hole made is usually 1.5 larger than the nominal diameter of the rivets as shown in the fig.

The drilled plates rae seperated for a while to remove any burrs or chips, and then kept together. A cold rivet is introduced into the plates in case of structural joints and a red-hot rivet, in case of leak-proof joints such as pressure vessels. Then with the help of the backup bar and die, hammer blows, are applied and riveting is done as shown in fig. when the rivet cools, the longitudinal tension caused due to thermal conduction holds the plates firmly together.

Auto Cold Riveting Machine: