SHEET METAL JOINTS

Figure 21.13 shows the common types of sheet metal joints.

Figure 21.13 Sheet Metal Joints

Lap Joint: It is the simplest and common type of joint that can be prepared by means of soldering or riveting processes.

Seam Joint: A seam is a joint made by fastening two edges to each other.

Hem Joint: Hem is an edge or border made by folding. It stiffens the sheet and does away with the sharp edge. Generally, two types of hem joints single hem and double hem are there. Single hem joints are made by folding the edges of the sheet over once to make it smooth and stiff while double hem joints are made by folding the edges over twice to make it smooth and stiff.

Wired Edge: The wired edge is smooth and very strong as it is prepared by folding the edges along a piece of wire.

Flange Joint: It is commonly used in making pipe connection.

Angular and Cup Joint: Angular and cup joints are mainly used for joining two pieces at an angle of 90°.

Cap Joint: It is a useful form of locked seam. Soldering or riveting or both processes are generally used with this type of joint to make it more effective in practical field.