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A Welding Defect Detection Model Based on Hybrid-Enhanced Multi-Granularity Spatiotemporal Representation Learning.

Chenbo Shi1, Shaojia Yan1, Lei Wang1

  • 1College of lntelligent Equipment, Shandong University of Science and Technology, Taian 271019, China.

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|August 14, 2025
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Summary
This summary is machine-generated.

This study introduces a novel algorithm for real-time molten pool monitoring in automated welding, enhancing quality control by accurately identifying defects and improving model interpretability for intelligent manufacturing.

Keywords:
deep learningimage interferencekey interference-free framesmulti-granularity spatiotemporal featuresporosity defect

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Area of Science:

  • Materials Science and Engineering
  • Robotics and Automation
  • Computer Vision and Machine Learning

Background:

  • Real-time molten pool monitoring is crucial for high-quality automated welding.
  • Existing methods face challenges with image interference (e.g., spatter reflections) and limited deep learning interpretability.
  • Accurate defect detection, such as distinguishing spatter from porosity, is essential for intelligent welding systems.

Purpose of the Study:

  • To develop a robust algorithm for real-time molten pool quality monitoring in complex welding scenarios.
  • To address interference issues in molten pool images and enhance the interpretability of deep learning models.
  • To achieve a balance between accuracy, inference speed, and interpretability for intelligent automated welding.

Main Methods:

  • Proposed a multi-granularity spatiotemporal representation learning algorithm combining handcrafted and deep learning features.
  • Utilized a MobileNetV2 backbone with Temporal Shift Module (TSM) for capturing dynamic molten pool features and temporal information.
  • Implemented a multi-granularity attention-based feature aggregation module with cross-frame attention and Convolutional Block Attention Module (CBAM).
  • Integrated handcrafted Histogram of Oriented Gradient (HOG) and Scale-Invariant Feature Transform (SIFT) features for enhanced interpretability.

Main Results:

  • Achieved a high accuracy of 99.187% on a self-constructed dataset for molten pool quality monitoring.
  • Attained a real-time inference speed of 20.983 ms per sample on a platform with Intel i9 CPU and RTX 3060 GPU.
  • Demonstrated effective balancing of accuracy, speed, and interpretability in the proposed method.

Conclusions:

  • The proposed hybrid feature learning algorithm effectively addresses interference and interpretability issues in molten pool monitoring.
  • The method enables accurate and efficient real-time quality assessment for intelligent automated welding systems.
  • This approach offers a promising solution for advancing the capabilities of automated welding technology.