Which welding approach is specified for clad materials that exceed a certain thickness?

Which welding approach is specified for clad materials that exceed a certain thickness?

• A. Dual (composite) weld
• B. Single-pass weld
• C. Overlay weld
• D. Fillet weld

Answer: (A)

When a clad plate is thick, you need a welding approach that ensures proper bonding through the entire thickness and builds up the surface with the right properties. A dual (composite) weld does this by using two coordinated weld deposits or passes: one that fuses the clad to the base metal at the interface, and a second overlay that completes the thickness and provides the required corrosion-resistant surface. This sequence controls heat input, promotes full fusion at the interface, and reduces risks like lack of fusion, porosity, or cracking that can occur with a single, thick weld.

Using only a single-pass weld wouldn’t reliably fuse through the full thickness or guarantee a solid bond between the cladding and base. An overlay weld by itself adds material on the surface but doesn’t ensure bonding at the interface across the entire thickness. A fillet weld isn’t suitable for thick, full-penetration joints between clad layers.