10.11 Butt Joint
The butt joint is obtained by placing the plates edge to edge as shown in Fig. 10.3. In butt welds, the plate edges do not require bevelling if the thickness of plate is less than 5 mm. On the other hand, if the plate thickness is 5 mm to 12.5 mm, the edges should be bevelled to V or U-groove on both sides.
Fig. 10.3. Types of butt joints.
* For further details, refer author’s popular book ‘A Textbook of Workshop Technology’.
The butt joints may be
1. Square butt joint,
2. Single V-butt joint,
3. Single U-butt joint,
4. Double V-butt joint, and
5. Double U-butt joint.
These joints are shown in Fig. 10.3.
The other type of welded joints are corner joint, edge joint and T-joint as shown in Fig. 10.4.
(a) Corner joint.
(b) Edge joint.
Fig. 10.4. Other types of welded joints.
The main considerations involved in the selection of weld type are:
1. The shape of the welded component required,
2. The thickness of the plates to be welded, and
3. The direction of the forces applied.