What is a permissible criterion for the weld joint in a bend test?

In assessing the permissible criteria for a weld joint in a bend test, it is important to consider the integrity and performance of the weld under stress. Each of the options provided reflects acceptable criteria that can be applied to ensure the quality and soundness of welded joints during testing.

First, the criterion regarding cracks exceeding 1/4" in the weld area emphasizes the need for maintaining structural integrity. A crack of this magnitude would be indicative of potential failure points, so allowing cracks of this size helps in evaluating the robustness of the weld.

Second, the requirement that the weld joint bending does not result in breaking into several pieces is critical. This criterion assesses the continuity and ductility of the weld. If the weld separates into multiple fragments during the bend test, it can signify a significant flaw that compromises the weld’s ability to perform under operational conditions.

Lastly, the specification that defects do not exceed 1/4" in the fusion zone focuses directly on the zone where the welding material and base metal meet. Controlling defect sizes in this area is critical because it is where the majority of stress will occur under loading conditions. Larger defects can lead to weaknesses at the most crucial points of the weld.

Considering the importance of these criteria, when taken together, they