Development of seam tracking device in asynchronous tandem welding with arc sensing

Area of Science:

• Welding Engineering
• Robotics
• Automation

Background:

• Tandem welding enhances speed and volume for large structures like ships and plants.
• Thermal deformation in tandem welding necessitates precise seam tracking.
• Arc interference in tandem welding complicates uniform current and voltage, hindering seam tracking.

Purpose of the Study:

• To identify and evaluate an optimal signal for seam tracking in tandem welding.
• To develop a robust algorithm for seam tracking that addresses arc interference.
• To create and validate specialized equipment for enhanced tandem welding seam tracking.

Main Methods:

• Developed an algorithm to separate welding signals into peak, average, and base components.
• Utilized regression and signal-to-noise ratio analyses to select the optimal seam-tracking signal.
• Calculated the welding current's area difference between the V-groove's left and right sides for tracing.

Main Results:

• Successfully identified a suitable seam-tracking signal by analyzing signal components.
• Developed an algorithm and equipment based on the welding current's area difference.
• Verified the seam tracking system's effectiveness through practical application tests.

Conclusions:

• The developed algorithm and equipment effectively enable seam tracking in tandem welding.
• The current area difference is a viable metric for precise seam tracking.
• This advancement improves welding accuracy and efficiency in large-scale applications.