What is seam tracking in robot welding?

• A. Using sensors to maintain contact with a weld seam while traversing along it
• B. Calibrating the seam position before welding
• C. Achieving maximum welding speed
• D. Measuring seam color

Answer: (A)

Seam tracking is using sensor feedback to follow the weld seam in real time so the welding torch stays aligned as it moves along the joint. The system continuously detects where the seam is and adjusts the torch offset or path to keep the arc centered on the seam, which helps produce a consistent bead and proper penetration.

This can be done with contact sensors that feel the seam as the torch travels, or with non-contact sensors such as vision, laser, or infrared that identify the seam geometry from a distance. The goal is to adapt to variations in the seam or part fit-up, such as gaps or distortion, so the weld remains on the intended path.

Calibrating seam position before welding is a static setup step and doesn’t compensate for deviations occurring during the weld. Maximizing welding speed is about speed, not real-time seam following. Measuring seam color has no direct relation to tracking the weld path.