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WELDING SENSORS

Robotic Welding Sensors & Seam Tracking

Even well-positioned parts can vary slightly. OTC DAIHEN sensing technologies help robots find the joint before welding and follow its path as welding progresses.

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Robotic welding sensing and seam-tracking equipment
DURING WELDING

Laser Seam Tracking

Laser sensors measure the joint ahead of the torch, helping the robot follow the actual weld path rather than relying only on a programmed position.

OTC DAIHEN FD-QTS laser seam tracking sensor mounted beside a welding torch

FD-QTS

A compact, high-speed laser tracker that helps the torch follow the joint during welding.

  • Measures joint position and gap as welding progresses
  • Can adjust torch position, angle and welding settings to suit the joint
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OTC DAIHEN FD-QT laser seam tracking sensor mounted beside a welding torch

FD-QT

Laser tracking for compatible FD-19 systems, helping the robot follow the joint as it welds.

  • Detects changes in joint position and gap during welding
  • Can detect weld start and end points and adapt welding settings
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BEFORE WELDING

Find the actual joint position before welding starts, so the robot can allow for differences in how each part is positioned.

OTC DAIHEN FD-QF laser search sensor mounted beside a robotic welding torch

FD-QF

Quickly finds the weld joint using a blue laser, without touching the workpiece.

  • Uses 2D laser sensing to recognise the shape of the joint
  • Joint detection can be set up and checked from the teach pendant
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OTC DAIHEN FD-QD laser search sensor mounted beside a robotic welding torch

FD-QD

Measures the joint position and shape before welding to help compensate for part-to-part variation.

  • Recognises different joint shapes on thin to medium-thickness material
  • Results can be viewed on the teach pendant and used to adjust welding settings
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CONTACT & ARC FEEDBACK

Touch & Arc Sensing

Not every job needs a laser. Touch sensing locates the part before welding, while arc feedback helps make corrections during welding.

OTC DAIHEN robot and welding torch illustrating FD-WD touch sensing

FD-WD

Finds the workpiece position by touching it with the welding wire before welding starts.

  • Helps account for small changes in how parts are positioned
  • Can be used alongside compatible through-arc tracking systems
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OTC DAIHEN robot and welding torch illustrating FD-AR through-arc seam tracking

FD-AR

Uses feedback from the welding arc and a weaving motion to follow the joint during welding.

  • Helps follow curved seams and compensate for distortion from welding heat
  • Does not require an extra sensing head beside the torch
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UNDERSTAND THE PROCESS

Seam Searching vs Seam Tracking

Some sensors locate the joint before welding; others make adjustments while the weld is being made.

01 / BEFORE WELDING

Seam Searching

Parts may sit a little differently from one cycle to the next. Seam searching finds where the joint actually is, allowing the robot to adjust its weld position before the arc starts. Laser search and touch sensing are two ways to do this.

02 / DURING WELDING

Seam Tracking

Seam tracking helps the torch follow the joint as welding progresses. Laser tracking and through-arc tracking can correct the weld path.

Find the Right Sensing Solution

Tell us about your parts, materials and welding process. We can help you explore the sensing options that suit your application.

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