Class 5 Boiler Practice Exam

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What is the maximum amount of weld undercut allowed by ASME B31.1?

1/16"
1/32"
1/8"
1/4"

The correct answer is: 1/32"

The correct maximum amount of weld undercut allowed by ASME B31.1 is 1/32". According to ASME B31.1, the standard emphasizes the integrity of welds in piping systems, and a weld undercut can significantly reduce the strength of a welded joint. Undercut refers to a groove or recess that forms along the edge of the weld and is not filled with weld metal, which can create a weak point in the joint. Allowing a specific maximum undercut dimension helps ensure the safety and reliability of piping systems. By setting the limit to 1/32", ASME B31.1 establishes a standard that maintains a balance between practical welding processes and structural integrity. This limitation serves as a guideline for weld quality in various industrial applications, ensuring that the joints can withstand operational pressures and stresses without failing. Adhering to this standard is crucial for maintaining the safety and performance of boiler and piping systems.