the first quarter of 2005, Russian steel pipe production the situation front of the judge. According to the investigation of the plant straight weld UT inspection system to detect internal and external defects in welds angle probe: outer weld 60,hollister carugate, the frequency of 5MHz; welding, 7O. , 4MHz. Depend on the probe side of the B-side from the lower part of the sidewall of the two pores are arc, the simulation of stomatal uT flaw,abercrombie münchen, the other side of the A side. A side of the reflection wave height higher than 1.6mm vertical vias reflected wave to reduce 6dB B side is lower than 1.6mm vertical through-hole 4dB, the closed pores in the ultrasound examination failed to spray standard and to be eliminated. Located in the pores ① ② with UT...