Weld Quality Issues

• A. Porosity, Spatter, Under cutting, cratering
• B. Surface roughness only
• C. Color change
• D. Nonmetallic inclusions only

Answer: (A)

Weld quality issues are defects that weaken a weld joint and shorten its service life. The best option covers several of the most common defects that inspectors routinely look for: porosity, spatter, undercut, and cratering. Porosity means gas is trapped in the molten metal, creating voids that reduce strength and can initiate cracks; it’s typically caused by moisture, contaminants, or inadequate shielding. Spatter refers to small metal droplets expelled during welding that land on surrounding surfaces, revealing arc stability problems or improper parameters and complicating inspection or corrosion resistance. Undercutting is a groove along the weld toe where the base metal is melted away, thinning the joint and creating a stress concentration that promotes fatigue failure. Cratering occurs at the end of a weld when the pool solidifies too quickly, leaving a crater that can crack if not properly filled or cooled, especially in thicker sections.

Other options describe a single symptom or defect type rather than a broad set of common weld quality issues. Surface roughness measures how the finish looks, but a weld can be functionally deficient even if roughness isn’t severe. Color change signals overheating or oxidation, but doesn’t capture the range of weld defects. Nonmetallic inclusions are just one internal defect type among many; they don’t represent the broad category of weld quality issues.