What are the difficulties of inspection in cast steel production?

In actual inspection, large cast steel will encounter some difficulties during inspection, which affects the inspection of this part, so what are the difficulties in inspection? Briefly describe below

1. Due to the scattering of non-uniform or loose tissue, the scattered signal is difficult to detect due to the large amount of clutter, and the scattered signal is also relatively strong. If the sound waves reflect off a rough surface, some clutter will form. The presence of clutter can affect the confirmation of the echo, or even be submerged.

2. The ultrasonic penetration ability is poor, because there are complex interfaces such as coarse grains and uneven structure inside, which enhances ultrasonic scattering and attenuates ultrasonic energy, which affects its application in large-scale cast steel inspection.