What should be checked for when visually inspecting the root bead of a single-vee-butt weld?

• A. Excess weld metal height
• B. Lack of penetration
• C. Surface porosity
• D. Weld bead alignment

Answer: (B)

When visually inspecting the root bead of a single-vee-butt weld, one of the critical aspects to check for is lack of penetration. This refers to the insufficient depth of fusion between the weld metal and the base material at the root of the weld joint. Proper penetration is essential for the strength and integrity of the weld. If there is a lack of penetration, it can lead to a weak joint that may not withstand the intended loading conditions, ultimately compromising the structural integrity of the assembly.

Inspecting for lack of penetration involves looking closely at the profile of the weld at the joint. Any indications such as a gap between the base material and the weld can suggest improper fusion, which can affect the overall quality and performance of the weld.

While factors such as excess weld metal height, surface porosity, and weld bead alignment are important for overall weld quality, they do not directly address the critical aspect of penetration at the root bead specifically, making lack of penetration the most relevant concern when examining this part of the weld.