Rivet head dating

Before being installed, a rivet consists of a smooth cylindrical shaft with a head on one end. On installation, the rivet is placed in a punched or drilled hole, and the tail is upset, or bucked (i.e., deformed), so that it expands to about 1.5 times the original shaft diameter, holding the rivet in place.In other words, pounding creates a new "head" on the other end by smashing the "tail" material flatter, resulting in a rivet that is roughly a dumbbell shape.Rivets were placed in the furnace and heated to glowing hot (often to white hot) so that they were more plastic and easily deformed.The rivet warmer or "cook" used tongs to remove individual rivets and throw them to a catcher stationed near the joints to be riveted.Solid rivets are also used by some artisans, in the construction of modern reproduction of medieval armour, jewellery and Metal Couture ==== High-strength structural steel rivets ==== Until relatively recently, structural steel connections were either welded or riveted.High-strength bolts have largely replaced structural steel rivets.In the seismic retrofit of such structures it is common practice to remove critical rivets with an oxygen torch, precision ream the hole, then insert a machined and heat treated bolt.=== Semi-tubular rivets === Semi-tubular rivets (also known as tubular rivets) are similar to solid rivets, except they have a partial hole (opposite the head) at the tip.

Typical materials for aircraft rivets are aluminium alloys (2017, 2024, 2117, 7050, 5056, 55000, V-65), titanium, and nickel-based alloys (e.g., Monel).

A rivet compression tool does not require two people, and is generally the most foolproof way to install solid rivets.

Solid rivets are used in applications where reliability and safety count.

Steel rivets can be found in static structures such as bridges, cranes, and building frames.

The setting of these fasteners requires access to both sides of a structure.

Leave a Reply