钛合金焊缝的超声检测工艺

针对钛合金焊缝超声检测时信噪比低、组织噪声水平高的问题,进行了超声可检性分析;对钛合金焊缝超声检测用仪器、探头及对比试块与碳钢检测要求不一样的地方做了对比分析;并对钛合金焊缝超声检测的探头、对比试块、信噪比及距离-波幅曲线进行了探讨。结果表明,小晶片、短前沿专用横波斜探头在钛合金材料焊缝的超声检测中效果明显,提高了检测信噪比及焊缝检测区的覆盖范围。自行加工制作的钛合金对比试块符合标准要求,总结了钛合金焊缝超声检测探头的选取、仪器调节、声速测试、曲线制作的相关经验,为后期智能制造项目中合理制定无损检测工艺提供了依据。优化的检测工艺在工程实践中得到了应用,取得了良好的效果。

Ultrasonic Testing Process of Weld in Titanium Alloys

The ultrasonic inspection of titanium alloy welds is subjected with low signal-to-noise ratio and high level of tissue noise.The instruments,probes and comparative test blocks used for ultrasonic testing of titanium alloy weld seams are compared with those for carbon steel.The ultrasonic probe,contrast test block,the signal to noise ratio and DAC curve of the titanium alloy weld are also discussed.The results show that the special transverse wave probe of small chip and short cutting edge is obviously effective for the ultrasonic inspection of the weld of titanium alloy,and the detection signal to noise ratio and the coverage range of the weld detection area are improved.The self-made titanium alloy contrast test block meets the standard requirements.The selection of ultrasonic detection probe,the adjustment of the instrument,the sound speed test and the experience of curve making are summarized in the paper,which provides the basis for the NDT process in the later intelligent manufacturing project.The optimized detection technology has been applied in engineering practice and has achieved good results.