Related Experiment Video
Updated: Jan 14, 2026
07:58
Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
Published on: July 25, 2025
757
Dynamic synchronization and feature region fusion for real time girth weld tracking
Yi Zhang1,2, Shaojie Wu1, Fangjie Cheng3,4
1School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.
Scientific Reports
|October 24, 2025
Summary
This study presents a novel weld-tracking system for narrow-gap pipeline welding. It achieves high accuracy and fast response times for automated welding by synchronizing torch oscillation with current analysis.
Area of Science:
- Robotics and Automation
- Materials Science and Engineering
- Welding Technology
Background:
- Narrow-gap all-position girth welding of pipelines presents significant challenges due to spatial complexity and dynamic arc behavior.
- Existing seam tracking methods often struggle with accurate signal boundary extraction and real-time control, limiting automation effectiveness.
Purpose of the Study:
- To develop an advanced weld-tracking system for narrow-gap pipeline welding.
- To improve accuracy and real-time control in automated welding processes.
Main Methods:
- Integration of torch oscillation synchronization with welding current feature-region analysis.
- Dynamic partitioning of welding current into three regions using Pulse (P) and Direction (D) signals.
- Implementation of a binary linear regression model for vertical tracking and trapezoidal integration for horizontal tracking.
Main Results:
- Achieved a steady-state accuracy of 97% and a dynamic response time under 50 ms.
- Demonstrated a precision of ±0.10 mm for seam tracking.
- Overshoot-free adjustments with steady-state errors below 2.2% using cosine-curve displacement control.
Conclusions:
- The developed system effectively enhances automated welding by combining dynamic signal synchronization with algorithmic integration.
- This work offers a novel framework for real-time control in challenging narrow-gap welding applications.
Related Concept Videos
01:10Deformation in a Circular Shaft
850
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
850
01:25Relative Motion Analysis using Rotating Axes
876
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
876
01:06Virtual Work for a System of Connected Rigid Bodies
721
Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
Next,...
Next,...
721
01:20Plastic Deformation in Circular Shafts
443
When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
443
01:29Relative Motion Analysis using Rotating Axes-Problem Solving
695
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Here, in order to determine the magnitude of velocity and acceleration for point...
695
01:24Sequence Networks of Rotating Machines
484
A Y-connected synchronous generator, grounded through a neutral impedance, is designed to produce balanced internal phase voltages with only positive-sequence components. The generator's sequence networks include a source voltage that is exclusively in the positive-sequence network. The sequence components of line-to-ground voltages at the generator terminals illustrate this configuration.
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
Zero-sequence current induces a voltage drop across the generator's neutral impedance and other...
484