AP1000蒸汽发生器进出口接管超厚镍基合金预堆边焊缝的超声检测

Ultrasonic Examination of Ultra-Thick Nickel Base Alloy Buttering Welds for AP1000 Steam Generator Inlet and Outlet Nozzle

针对镍基合金晶粒粗大,超声波检测时声衰减严重且信噪比低,无法在完全堆焊结束后按设计图纸要求的检测方法和灵敏度进行超声波检测的问题,根据AP1000蒸汽发生器进出口接管超厚镍基合金预堆边焊缝的特点,采用特殊的超声检测工艺,制作了平行和垂直于焊接方向的两种反射体,较好地完成了超厚镍基合金预堆边的超声波检测。

The full thickness ultrasonic examination according to the requirement of design drawing for nickel base alloy buttering is impossible,because of coarse-grained nickel base alloy and serious attenuation and low signal to noise ratio.There exist distinctions of ultrasonic examination sensitivity in different scanning direction for anisotropic materials.According to the characteristics of the weld,specifically designed examination process of using parallel and vertical reflectors with respect to welding direction is performed to finish the ultrasonic examination of ultra-thick nickel base alloy buttering.