NOTE The transmission technique has insufficient sensitivity to detect the discontinuities found in spheroidal graphite cast iron castings and is used in exceptional cases only.
NOTE The transmission technique has insufficient sensitivity to detect the discontinuities found in spheroidal graphite cast iron castings and is used in exceptional cases only.
注意:在球铁铸件的铸造中,(超声波的)发射技术对于检测非连续的铸造是不够准确的,只有在例外的情况下才使用.