Delay !!hot!! Crack — H
A delayed crack can lead to . Since these cracks often form deep within a joint or surface after the inspector has left the site, they are "silent killers" in industries like bridge building, offshore oil rigs, and pressure vessel manufacturing.
The "delay" occurs because time is required for hydrogen to diffuse to the area of high stress. Initially, the concentration is too low to cause damage. Over hours or days, the concentration builds up to a critical level. h delay crack
For a crack to form, four specific conditions must exist simultaneously: A delayed crack can lead to