It is proposed to conduct flaw detection of the casting surface layer (up to 10 mm in depth) by means of Rayleigh waves with two ultrasonic probes. In this case it is possible to introduce an estimation of defect penetration depth for the defects (creaks, cells) taking into account correlative amplitude and time curves based upon measurements on notch and side cylindrical holes. The results of such inspection allows to consider economical expediency of further steps of the casting within technological chain.

As far as cast iron foundings are concerned graphite inclusion form is important factor for structure formation. Well - known methods of its estimation on longitudinal wave velocity can be implementation only for simple casting configurations and require availability of double access to the founding in combination with parallelism of the contrast surfaces in measurement points. We suggest the method on graphite inclusion form detection implementation of which is not limited by abovementioned conditions. This method is based upon the correlation between velocity, head wave amplitude and graphite form. The method can be implemented on raw surface under chill - mould cast and on surface after crush - flow processing under sand - mould cast. This method employs USC - 1 apparatus produced by CNIITMASH which is in operation at KAMAZ plant.