Which defects can be identified by their appearance, and what are some examples?

Which defects can be identified by their appearance, and what are some examples?

• A. Slag inclusion; Porosity; Cracks; Undercut; Lack of fusion.
• B. Porosity; Cracks; Undercut; Overlap; Lack of fusion.
• C. Cracks; Slag inclusion; Porosity; Cold shuts.
• D. Porosity; Cracks; Underfill; Surface oxidation.

Answer: (A)

Visual inspection focuses on flaws that show up on the surface of the weld, so you’re looking for defects that can be identified by appearance. Slag inclusion shows up when nonmetallic slag is trapped inside the weld metal, which often appears as a visible line or region within the bead near the surface. Porosity shows up as small pores or dimples on the weld surface, indicating gas pockets formed during solidification. Cracks are surface fractures that you can see as hairline or wider separations along the weld. Undercut appears as a groove or notch along the weld toe where the base metal is left unsupported, visible as a distinct depression. Lack of fusion is seen where the weld metal fails to fuse with the base metal or previous passes, showing up as a gap or seam at the root or interfaces. These are the defects most readily identified by appearance during VT because they alter the surface geometry or show nonmetallic material within or at the edge of the weld. While other surface irregularities can also be noticed visually, the combination listed reflects the common, clearly identifiable appearance defects a welder or inspector would spot with the naked eye.

Visual inspection focuses on flaws that show up on the surface of the weld, so you’re looking for defects that can be identified by appearance. Slag inclusion shows up when nonmetallic slag is trapped inside the weld metal, which often appears as a visible line or region within the bead near the surface. Porosity shows up as small pores or dimples on the weld surface, indicating gas pockets formed during solidification. Cracks are surface fractures that you can see as hairline or wider separations along the weld. Undercut appears as a groove or notch along the weld toe where the base metal is left unsupported, visible as a distinct depression. Lack of fusion is seen where the weld metal fails to fuse with the base metal or previous passes, showing up as a gap or seam at the root or interfaces.

These are the defects most readily identified by appearance during VT because they alter the surface geometry or show nonmetallic material within or at the edge of the weld. While other surface irregularities can also be noticed visually, the combination listed reflects the common, clearly identifiable appearance defects a welder or inspector would spot with the naked eye.