Welding Inspection & Metallurgy API ICP Self Study Notes

One of the most common tests used in the development of welding
procedures is the bend test. The bend test is used to evaluate the relative
ductility and soundness of welded joint or weld test specimen. The specimen
is usually bent in a special guided test jig. The specimens are subjected to
strain at the outer fiber by bending the specimen to a specified radius that is
based on the type of material and specimen thickness. Codes generally
specify a maximum allowable size for cracks in a bend specimen. Cracks and
tears resulting from a lack of ductility or discontinuities in the weld metal are
evaluated for acceptance or rejection to the applicable code requirements.