Question

To measure the strength of a welded joint, what mechanical test would you prescribe?

a) A transverse weld tension test
b) A charpy test
c) A CTOD test
d) An all weld metal tension test
e) A side bend test

Answer 1

To measure the strength of a welded joint, an all-weld metal tension test is the best choice as it evaluates the tensile strength of the weld itself. This mimics the real-world tensile stresses that a weld would encounter, consistent with FIGURE 5.13 indicating how rods behave under tension.

Step-by-step explanation:

To measure the strength of a welded joint, the prescribed mechanical test would be d) An all-weld metal tension test. This test is specifically designed to evaluate the tensile strength of the welded material itself, without the influence of the base metal. In this test, a sample containing the weld is pulled until it breaks, and the maximum force it can withstand is measured. The tension test represents the real-life forces that would be applied to the weld in a parallel direction, similar to FIGURE 5.13 (a), where a rod is stretched a length ΔL when a force is applied parallel to its length. For a thorough analysis, other tests such as a Charpy impact test (b) or a Crack Tip Opening Displacement (CTOD) test (c) might be used to evaluate other properties like toughness or crack resistance, respectively.