Guided Bend Testing
This test method covers a guided bend test for the determination of soundness and ductility of welds in ferrous and nonferrous products as defined by ASTM E190.
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This guided bend test has been developed primarily for pipes and plates and is not intended to be substituted for other methods of bend testing.
The bend test is designed to evaluate the quality of welds as a function of ductility in ferrous and nonferrous products as evidenced by their ability to resist cracking during bending. Defects, not shown by X-rays, may appear in the surface of a specimen when it is subjected to progressive localized over-stressing.
The specimen is bent in a U-shaped die by means of a centrally applied force to the weldment in a flat specimen supported at two positions equidistant from the line of force application. The specimen is forced into the die by a plunger having the shape necessary to produce the desired contour. The bend specimen convex surface is examined for cracks or other defects.
The types of specimens are usually rectangular ones machined from plates and pipes. The cut surfaces are designated the sides of the specimen. The other two surfaces are called the face and root surfaces, the face surface having the greater width of weld. For this test method, guided bend specimens are of three types, depending on whether the axis of the weld is transverse or parallel to the longitudinal axis of the specimen, and which surface (side, face, or root) is on the convex (outer) side of bent specimen. The three types are defined as follows:
a. Transverse Side Bend. The weld is transverse to the longitudinal axis of the specimen which is bent so that either one of the side surface becomes the convex surface of the bent specimen.
b. Transverse Face Bend. The weld is transverse to the longitudinal axis of the specimen which is bent so that the weld face becomes the convex surface of the bent specimen.
c. Transverse Root Bend. The weld is transverse to the longitudinal axis of the specimen which is bent so that the weld root becomes the convex surface of the bent specimen.
We do not sell wrap around bend testing machines.
We provide guided bend testing services using a wrap around bend testing machine.