Lack of penetration

Check cracks are visible from the surface and extend partially into the weld. In the radiograph, it appears as a dark irregular line along the outside edge of the weld area. Figure 5 shows examples of acceptable and unacceptable weld profiles. Weld strength is not determined by the level of penetration into the base plates. Defects related to fracture. Both will allow the molten weld metal to roll in front of the arc, acting as a cushion to prevent penetration.

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