The application of rivets in steel structures is a strange phenomenon, but it was acceptable in the past. This bridge has more riveting than any steel structure in Australia. The structural rivets used in bridges are made of low carbon steel with 413-42MPa UTs and high shear strength. Similar to the span steel, the micro-structure is primary ferrite, which is about 20% pear-lite.
: there are more than 6000000 rivets on the bridge. Insert the rivet into the plate to make it red. One end of the rivet is headless, a bit like a round head bolt. The other end is inserted into the hole to connect the parts. After the forging rivet
is inserted into the plate, the end of the head will be rounded to prevent the rivet from moving. In this way, the rivet head is formed and then forged. This method obtained good grain flow and skipped the weak points in the rivet. It is similar to the drop forging rivet
when good grain flow is achieved.
The grain flow of rivet (right) is processed by hot-rolled steel bar. Pay attention to the drastic changes in the flow of the rivet head. Rivet (left) has good grain flow after hot plug and riveting, similar to hot forging. Hot riveting is the most direct example of hot forging in which the grain structure of the steel is consistent with the shape of the forging, making the parts produced relatively strong, and the particle flow is vertical.