CLC number: U446.2

Portable Multimodal Vision-Based Device for Non-Destructive Evaluation of Rebar Welds

基于多模态视觉的便携式焊缝无损检测装置

¹ Research Institute of Highway Ministry of Transport, Beijing 100088, China
² School of Electronic and Control Engineering, Chang’an University, Xi’an 710000, Shaanxi, China
³ Xizang Transportation Survey & Design Institute Co., Ltd., Lhasa 850000, Xizang Autonomous Rigion, China

^† Corresponding author. E-mail: xf.feng@rioh.cn

Received: 8 August 2024

Abstract

The quality of rebar welds directly impacts the overall service performance of highway infrastructure. However, current assessments of weld appearance quality primarily rely on traditional inspection methods such as manual visual inspection, which suffer from significant limitations in accuracy, reliability, and efficiency. Given the increasing demand for safety performance inspections of highway infrastructure in China, traditional methods struggle to meet modern rapid inspection requirements. Therefore, this study proposes the design of a portable, non-destructive inspection device for rebar weld appearance, utilizing visible light vision and line-structured light 3D scanning technology. The device is equipped with an STM32 master control chip to manage encoder reading, scanning laser control, ring fill light, industrial camera synchronization, image acquisition, and serial port command transmission. Additionally, a weld image processing and detection software system was developed to receive, store, and identify weld defects. A field inspection prototype was created and subjected to various defect weld detection experiments in a laboratory setting. Experimental results demonstrate that the device can accurately measure weld parameters by acquiring multimodal images, fulfilling defect detection requirements. The device features high detection accuracy, portability, and user-friendliness, making it significant for the objective inspection and evaluation of rebar weld appearance and welding quality.

摘要

钢筋的焊接质量直接影响公路基础设施整体服役性能，然而现阶段钢筋焊缝外观质量的评估主要依赖于人工目检等传统检测方法，在准确性、可靠性和效率方面存在显著局限性。在我国公路基础设施安全性能检测需求日益增长的背景下，传统检测手段已难以满足如今的快速检测要求。为此，本文基于可见光视觉与线结构光3D扫描技术，设计了一种便携式钢筋焊缝外观无损检测装置。该装置采用STM32主控芯片，负责管理编码器读取、扫描激光控制、环形补光、工业相机同步、图像采集以及串口指令传输。同时，开发了一套焊缝图像处理与检测软件系统，用于接收、存储和识别焊缝缺陷。实验室条件下，研究团队制作了原型机，并开展了多种焊缝缺陷的检测实验。结果表明，该装置通过多模态图像采集，可精确检测焊缝参数，完全满足钢筋焊缝缺陷检测需求。装置具有检测精度高、便携性强、操作简便等特点，为钢筋焊缝外观及焊接质量的快速检测与科学评估提供了重要技术支撑。