RIVETED AND WELDED JOINTS By

Dr. Rajeev Saha

Initial Form

of a rivet

RIVETED JOINTS

RIVETED JOINTS

Caulking and

Fullering process

to make rivet

joints leakproof

RIVETED JOINTS

Types of Rivet Heads

RIVETED JOINTS

Types of Rivet Joints

Lap Joint Butt Joint

RIVETED JOINTS

Diameter of shank of Rivet (d) = 6 t

where t = thickness of plate being connected in mm

The diameter (d) obtained is rounded to the nearest

standard size of rivets.

The standard sizes in mm as per BIS are: 12, 14, 16,

18, 20, 22, 24, 27, 30, 33, 36, 42, 48

Pitch (p) = 3d where pitch is the distance between

axes of adjoining rivets in same row measured

parallel to edges of plates.

RIVETED JOINTS

Row Pitch (pr) is the distance between two rows.

Row pitch is (2d) mm in zigzag type and (2d+6) mm

in chain type.

Diagonal pitch (pd) is the distance between axis of

nearest rivets in the adjoining rows. Its value is

7d/3.

Thickness of cover plates for Butt Joints:

Thickness of cover plate when only one cover plate

is used, tc1 = 1.125t

Thickness of each cover plate when two cover plates

are used, tc2 = 0.8t

Single Riveted Lap Joint

RIVETED JOINTS

Double Riveted

Chain type Lap Joint

RIVETED JOINTS

Double Riveted

Zigzag type Lap Joint

RIVETED JOINTS

Single Riveted double cover

Butt Joint

RIVETED JOINTS

Double Riveted single cover Zigzag Butt Joint

RIVETED JOINTS

Types and Symbols

WELDED JOINTS

Representation of welded joints

WELDED JOINTS

Representation of welded joints

WELDED JOINTS

Q1. Draw sectional front view and top view of a single-riveted lap joint for 10 mm thick plates.

Q2. Draw sectional front view and top view of a double-riveted lap joint (i) the chain, and (ii) the zigzag formation for 10 mm thick plates.

Q3. Draw sectional front view and top view of a single-riveted single cover plate type and double cover plate type butt joints for connecting 10 mm thick plates.

Q4. Draw top view and sectional front view of a single-riveted double cover butt joint. Take diameter of the rivet = 24 mm.

Q5. Draw sectional front view and top view of a double-riveted double strap butt joint (chain type). Take thickness of main plates = 8mm, cover plates = 5 mm, diameter of rivet = 12 mm, and pitch = 36 mm.

Q6. Sketch various types of welding joints along with their symbol.

ASSIGNMENT 4