For complete penetration, sound welded joints, and good strength, bevelling preparation of edges and cleaning are required. The type of groove or edge preparation depends on the thickness of the plate and the welding methods. Some of the edge preparation methods are shown in Figure 20.28.
Figure 20.28 Edge Preparation in Welding
The use of various types of groves varies with thickness of metal plates as discussed below:
- Thickness (t) < 6 mm: no edge preparation is required.
- 6 mm < t < 16 mm: single – V groove.
- t > 16 mm: double – V groove.
- t > 20 mm: single and double U – groove.
Types of Welding Positions: According to welding position the welding can be classified as flat, horizontal, vertical, and overhead welding as shown in Figure 20.29. For different positions of the welding, different methods of welding are used as per suitability.
Figure 20.29 Various Positions of Welding
Types of Welded Joints: According to relative position of two pieces of metal, which are to be joined, five types of weld joints are used in welding as shown in Figure 20.30.
Figure 20.30 Five Basic Types of Welded Joints
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