How to deal with cracks that keep spreading as they are polished?
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At first, it was just a small dot; as it was polished further, a line appeared, and even multiple cracks. Extend to areas where there were no cracks before.
At the end of the crack, drill a stop hole first; a diameter of 2 or 3 millimeters is sufficient.
Crack stop holes are one option, but it depends on the material and the actual conditions. Please, the original poster, explain the details clearly.
It’s similar to when a car’s windshield cracks: first make a hole to stop the crack from spreading, and then repair the crack.
Let’s talk about the material and operating conditions – is it for repairing welding cracks or corrosion cracks?
Pressure vessels are generally made of ductile materials; is the propagation of cracks during grinding related to pre-existing cracks, or is it independent of grinding?