Study on ultrasonic decontamination parameters and application of in-service pipeline inner wall

Ultrasonic decontamination technology was used to carry out decontamination tests on stainless steel pipes, observe the decontamination effect of ultrasonic decontamination on pipelines, and explore the influence of ultrasonic decontamination on the safety of pipelines containing welds. Metallic film was used to characterize the decontamination effect, metallographic microscope, micro-Vickers hardness tester, universal testing machine and other equipment were used to observe the matrix structure of the pipeline, compare the hardness and strength changes, and analyze the influence of ultrasonic decontamination on the safety of the pipeline. The experiment shows that with the determination of power, the ultrasonic decontamination effect is gradually enhanced with the extension of ultrasonic decontamination time. The mechanical properties test shows that the effect of ultrasonic decontamination on the material damage of pipeline matrix is almost zero under appropriate parameters.