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What are the types of cracks in the ultrasonic hardening machine and intermediate frequency hardening machine?

What are the types of cracks in the ultrasonic hardening machine and intermediate frequency hardening machine?

① Non-quenching cracks – surface cracks and T-shaped cracks on the surface edge.

② Quenching cracks – longitudinal cracks (structural stress type).

③ Arc crack (local tensile stress type).

④ Quenching cracks on large workpieces (longitudinal and transverse).

⑤ Profile surface cracks (local tensile stress type).

⑥ Delamination, the second type of stress crack.