To obtain leak proof joints, the edges of the plates to be joined and the rivet heads are forced to gether by caulking and fullering operations CAULKING Caulking plate The outer edges of the plates are bevelled These bevelled edges of the plates are caulked Caulking is an operation in which the outer bevelled edges of the plates are hammered and driven-in by a caulking tool The caulking tool is in the form of a blunt edged chisel

It is the distance from the edge of the plate to the entre of the nearest rivet hole. It is a the distance between adjacent gauge lines in the same plate.ģ6 Diagonal pitch: (pd) It is a the distance between the centres of adjacent rivets on adjacent gauge lines in the same plate.

It is a the distance from the centre of the rivet to the centre of the next rivet in the same row measured on the gauge lineģ5 Transverse pitch or back pitch or row pitch (pt) Gauge line: It is a line through the centers of a row of rivets and parallel to the edge of the plate The thickness of plate (t) The diameter of the shank (or rivet) (d) Using Unwin’s formula d6 t Standard diameters of rivets as perě.I.S. Rivet diameter is represented by ‘d’ and plate thickness is represented by ‘t’ Riveted joints may also be classified as Structural joints and Pressure vessel joints Angle Joint

SINGLE RIVETED DOUBLE STRAP BUTT JOINT 29ĭepending upon arrangement of rivets in adjacent rows, riveted joints are classified as Chain riveted joint and Zig-zag riveted joint of rows of rivets in a joint, riveted joints are divided into two types Single riveted joint and Multiple riveted joint Double riveted Triple riveted Quadruple riveted etc… Structural rivets (12 to 45mm dia.): Boiler rivets (12 to 50mm dia.) Small rivets (2 to 10mm dia.) (1) Structural rivets (12 toĔ5mm dia.): Used for structural work Round countersunk Countersunk Head Head Snap Head Pan Head Pan Head with Tapered neck 1111ġ2 TYPES OF RIVETS (2) Boiler rivets (12 to 50mm dia.): Used for boiler works Snap Head Pan Head Ellipsoidal Pan head 1 Conical Headġ3 TYPES OF RIVETS (2) Small rivets (2 to 10mm dia.): Used for general purposes and are of steel brass or aluminium Mushroom Head Countersunk Head Flat Head 1.75d 0.75d Round Headĭepending upon the manner of placing the plates, riveted joints are classified in to two types Lap joint and Butt joint Lap joint Butt jointĭepending upon no. ON THE BASIS OF TEMPERATURE OF SHANK HOT RIVETING COLD RIVETINGġ0 PURPOSE OF RIVETING For fluid tightness in case of Boilers, pressure vessels and ships For strength and rigidity in bridges, trusses, cranes and machinery For strength, rigidity, durability and leakproofness in shiphullġ1 TYPES OF RIVETS Following types of rivets are used for different work Rivet should be sound, free from cracks, flaws, burrs, seams, pits and other defects Rivet head should be concentric with axis of the shank Rivet end should be square with respect to the axisħ RIVETING The process of joining two or more plates by means of rivets is called rivetingĨ METHODS OF RIVETING During riveting, rivet head is formed from the tail of the rivet when it is placed in the rivet holes drilled in the plates to be fastened Forming of head may be either by hand tools or by machines In machine riveting, force is applied by means of hydraulic or pneumatic pressureĩ METHODS OF RIVETING METHODS OF RIVETING HAND RIVETING MACHINE RIVETING Material for rivets Essential qualities of Rivet Methods of Riveting Purpose of Riveting Classification of Rivets or Rivet heads Classification of Riveted joint Terminology of Riveted joint Caulking and Fullering operations Types of Failure and Strength Equations Riveted Joints for Boiler ShellĤ RIVET Rivets are short cylindrical pieces of ductile metal having a head, shank and tail Used to join two or more pieces of sheet metals permanently, plates to rolled sections, rolled section to each other etc… Rivets are used for joining of sheets and plates in bridges, boilers, storage tanks, pressure vessels and ships etc…ĥ MATERIAL FOR RIVETS Rivets made of mild steel are used in most of the applications Rivets used in corrosive atmosphere are made of stainless steel Rivets used for connecting non ferrous metals and soft materials are made of copper, brass, bronze and aluminium alloys Duralumin rivets are used for structural joints made of aluminium alloy section

Rivet joint in steel structure