基于兰姆波的管件直焊缝缺陷检测系统设计

摘要

板波是在板厚与波长相当的薄板中传播的波,就实用意义而言板波往往仅指兰姆波.本文主要设计利用施耐德PLC自动控制系统实现对一定长度薄壁压力管件的夹持、探头直焊缝轨迹行走,以及利用探头发射的兰姆波对管件直焊缝进行缺陷的检测与判别.利用C#语言编写上位机实现对缺陷信号的显示与处理.整体设计可靠性高,实用性强,满足了对薄壁压力管件直焊缝缺陷进行工业自动化检测的需求.%Plate wave is a wave propagating in a sheet whose thickness is equal to the wavelength.In practical terms,plate waves tend to refer only to lamb waves.This paper focuses on the design and im-plementation of Schneider PLC automatic control system that can probe a certain length thin-wall pres-sure pipe fittings and straight seam track walking.And the defects detection and discrimination of pipe fitting weld are carried out by using Lamb wave launched by probe.By using C# language the upper computer was written to realize the display and processing of defect signal.The overall design has high reliability and practicability and meets the requirement of industrial automatic inspection for the straight weld seam defects of thin-wall pressure pipe fittings.