Bend and Re-Bend Testing

The bending test of TMT bars is performed to test the steel ductility without affecting the steel strength. Conversely, the re-bend test is used to measure the effects of strain aging on steel. In steel, embrittlement can occur due to the diffusion of nitrogen after cold deformation that occurs with strain aging..

In the re-bend test, the bar is bent at an angle of 135 degrees. Keep the TMT bar in boiling water at 100 degrees for 30 minutes, followed by cooling down the same. Once cooled, twist it again to 157.5 degrees and check for rupture or cracks. The TMT bar shall be deemed to have passed the test if there is no rupture or crack visible at the bend portion (tension zone) to a person with normal vision. .

Techno Weld provides this type of testing which provides insight into the mechanical properties of a material and enables product designers to make informed decisions about when, where, and how to use a given material.