To verify proper weld penetration, which indication on the reverse side should the technician inspect?

To verify proper weld penetration, which indication on the reverse side should the technician inspect?

• A. Reverse Side Dimpling
• B. Porosity
• C. Crater Crack
• D. Spatter

Answer: (A)

Proper penetration means the weld fuses through the full thickness, bonding the two pieces together from the root to the far side. On the back side, dimpling indicates the weld metal has reached and bonded with the reverse side, creating small surface indentations as the molten metal flows and solidifies. This back-side dimpling is a visual cue that the joint has been welded through to the far side, not just on the surface. Porosity would show up as holes inside the weld and doesn’t indicate penetration depth. Crater cracks occur at the end of the weld and signal thermal stress issues, not whether the weld reaches the back side. Spatter are droplets on the surface and also don’t tell you about penetration. So the reverse side dimpling is the best indicator of proper penetration.

Proper penetration means the weld fuses through the full thickness, bonding the two pieces together from the root to the far side. On the back side, dimpling indicates the weld metal has reached and bonded with the reverse side, creating small surface indentations as the molten metal flows and solidifies. This back-side dimpling is a visual cue that the joint has been welded through to the far side, not just on the surface.

Porosity would show up as holes inside the weld and doesn’t indicate penetration depth. Crater cracks occur at the end of the weld and signal thermal stress issues, not whether the weld reaches the back side. Spatter are droplets on the surface and also don’t tell you about penetration. So the reverse side dimpling is the best indicator of proper penetration.