What is the typical penetrant indication for a forging lap?

A forging lap typically presents as a continuous line in penetrant inspection. This line signifies a discontinuity in the material, most commonly where two overlapping surfaces have failed to forge properly, leading to an inclusion or a lap defect. The continuous line in the inspection process indicates that a barrier to the material's integrity exists, making it easier for inspectors to identify and address potential defects.

In contrast, a series of dots normally suggests the presence of surface porosity or small isolated defects, which would not specifically indicate a forging lap. A zigzag pattern would likewise not represent a forging defect; rather, it might indicate other structural issues or surface irregularities that aren't typical for laps. Lastly, "no indication" would imply that there are no detectable defects when, in the case of a forging lap, a visible indication should be present, thus making option selection critical for accurate inspection practices.