Weld Crack

Weld cracks can:

• Occur during or after welding (Hot or Cold)
• May be visible on on the surface of the weld.
• Usually occur due to a stress concentration. Stress can be caused by surface or subsurface discontinuities.
• Can also occur due to the welding procedure or technique.
• Are described based on the direction of the crack relative to the weld. For example: Longitudinal/ Transverse

Crack Location

Depending on their position, information may be garnered from the location of the crack.

Throat - A crack that extends through the weld along the throat of the weld is usually stress related. Root - If the crack begins at the root of the weld or at the root surface, its cause is usually stress related. Toe - If there are base metal cracks that propagate from the toe of the weld, its cause is usually stress related. Crater - If the crack occurs at the termination point of the weld, it is probably technique related. Underbead - If the crack occurs at the Heat Affected Zone, it is usually procedure or technique related.