Cracks that may occur in welded materials are caused generally by by many factors and may be classified by shape and position, cracks are classed as planar.

- Classified by Shape 1. Longitudinal 2. Transverse 3. Branched 4. Chevron - Classified by Position 1. HAZ 2. Centreline 3. Crater 4. Fusion zone 5. Parent metal

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