AWS Welding Inspection and Testing Certification Practice Test

Overlap in welding refers to a condition where excess weld metal rolls over the base material without achieving proper fusion between the two. This situation typically occurs when the welder moves the electrode too quickly or fails to apply sufficient heat, leading to inadequate melting of the base material. As a result, instead of properly bonding to the surface, the weld metal sits on top, creating a defect that can compromise the integrity and strength of the weld.

This defect can impact the overall performance of the welded assembly, as it reduces the contact area between the weld and the base material, leading to potential issues with strength and durability. Proper weld technique and parameters are crucial to avoid this type of defect and ensure strong, effective welds.