A weld must be removed if it has a crack of more than what percentage of its weld length?

In assessing weld integrity, certain standards dictate the allowable limits for cracks or defects. A crack that exceeds 8% of the weld length is considered significant enough to compromise the weld's structural integrity, necessitating its removal. This threshold is critical because even small cracks can lead to larger failures if not addressed, especially under stress or load conditions.

When cracks are evaluated, a limit of 8% serves as a reliable benchmark for when a weld should be deemed unfit for use. This standard helps ensure safety and reliability in welded structures, where integrity is crucial for performance and longevity. The other percentages listed do not represent the severity threshold defined in industry standards, making 8% the appropriate choice for the removal of the weld.