During destructive testing of a butt joint with backing weld, what term describes the condition where metal tears away from one base piece while the weld remains with the other piece?

During destructive testing of a butt joint with backing weld, what term describes the condition where metal tears away from one base piece while the weld remains with the other piece?

• A. Yield
• B. Delamination
• C. Tearout
• D. Fracture

Answer: (C)

Tearout is the failure mode described here. In a destructive test of a butt joint with backing, tearout happens when the metal cracks or shears away from one base piece at the weld interface, while the weld itself remains attached to the other piece. It shows the weld-to-base metal bond is stronger on one side and weaker on the other, leading to the base metal on that side being torn away. This contrasts with yield (plastic deformation without a complete separation), delamination (layers pulling apart, typically in laminated materials), and fracture (a break through the weld or base metal itself). The pattern where one base piece comes loose from the joint while the weld stays with the opposite piece is exactly tearout.

Tearout is the failure mode described here. In a destructive test of a butt joint with backing, tearout happens when the metal cracks or shears away from one base piece at the weld interface, while the weld itself remains attached to the other piece. It shows the weld-to-base metal bond is stronger on one side and weaker on the other, leading to the base metal on that side being torn away. This contrasts with yield (plastic deformation without a complete separation), delamination (layers pulling apart, typically in laminated materials), and fracture (a break through the weld or base metal itself). The pattern where one base piece comes loose from the joint while the weld stays with the opposite piece is exactly tearout.