Which of the following is NOT one of the four basic weld types?

Which of the following is NOT one of the four basic weld types?

• A. Surfacing
• B. Plug/Slot
• C. Groove
• D. Butt weld

Answer: (D)

Understanding how weld types are categorized hinges on how the joint is filled or joined. Surfacing welds add material to a surface to buildup or restore thickness. Plug or slot welds join pieces through a drilled hole or slot. Groove welds fill a prepared groove between pieces to create the seam. A butt weld describes two pieces placed in line and joined at the ends, but the weld used to join a butt joint is typically a groove weld, not a separate basic category. So, while butt joints are common, the butt weld isn’t treated as one of the four basic weld types on its own. The other options align with the fundamental weld-fill approaches, whereas the butt weld is really a joint configuration realized by a groove weld.

Understanding how weld types are categorized hinges on how the joint is filled or joined. Surfacing welds add material to a surface to buildup or restore thickness. Plug or slot welds join pieces through a drilled hole or slot. Groove welds fill a prepared groove between pieces to create the seam. A butt weld describes two pieces placed in line and joined at the ends, but the weld used to join a butt joint is typically a groove weld, not a separate basic category. So, while butt joints are common, the butt weld isn’t treated as one of the four basic weld types on its own. The other options align with the fundamental weld-fill approaches, whereas the butt weld is really a joint configuration realized by a groove weld.