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Laser Processing Head PDT  

Laser Processing Head PDT On the Leading Edge

These are the properties which allow the II-VI HIGHYAG PDT to tap into new applications for time- and cost-saving laser brazing and welding. With this self-controlled laser machining head, it is now possible to utilize rational laser technology without technological effort, e.g., for welding trunk lids, for roof and sealing duct brazing or for brazing and welding overlap joints (flange welds and fillet welds).

The problem-free use of the PDT is based on a tactile servo motor assisted seam tracking, which is integrated in the machining optical system. This involves a tactile sensor finger, optionally with or without a wire, via an innovative optic-mechanical rotary motion that is directly coupled with the focus guidance system.

The processing head can traverse the laser focus to the precise welding or brazing  position and then safely and accurately guide it over the workpiece during the process. This compensates for tolerances of the component part and inaccuracies of either the programming or the handling machine. The path can remain unchanged, thus significantly simplifying control.

With the help of a PC-based user interface, a parmeterization of the head (control functions, inputs and outputs) is possible.

The modular optic and mechanical design of the head enables versatile use through the wide range of components offered. For the corresponding modules, this makes it possible to set different scales of figures for welding and brazing and use different types of lasers.

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Modular System »


PDT with pressure wheel: seam tracking and integrated clamping technology, the advantages of two systems in one processing head


  • Laser welding or laser brazing of fillet and edge-formed seams
System Features

Optimized modular optical systems:

  • Laser brazing
  • Laser welding
  • Optic modules with focus forming
Tactile seam tracking with servo motor support
  • Accurate adjustment of wire/tactile sensor
  • Wide angular sensor range for optimized component access
  • Absolute values for process point
  • Direct control via Interbus (or similar)
  • PC program for parameter set-up
  • Cross jet for extended cover slide life time
  • CCTV viewing system with integrated illumination of process point
  • Robot adaptation with crash sensor
  • Interface to PLC

CCD camera with viewing system: visualizing the process in set-up and production

PDT terminal: optimum parameterization for the individual application

Laser Processing Head PDT

PDT Front PDT Left PDT Back


Laser Processing Head PDT Technical Data

Optical System
Focusing system (magnification @ focal length) 0.75 @ 150 mm, 1.00 @ 200 mm, 1.70 @ 340 mm, 3.30 @ 660 mm, *
Collimation system (magnification @ focal length) 1.8 @ 110 mm, 2.0 @ 100 mm, 2.3 @ 90 mm, 3.0 @ 70 mm, *
Max. average laser power 6 kW
Max. beam parameter acceptance (half angle) of laser light exiting fiber 97% power content within 125 or 210 mrad
Wave length 800 - 950 nm, 1020 - 1080 nm
Transmission > 95%
Core diameter laser light cable 300 - 1000 μm (typical)
Laser light cable receiver HIGHYAG LLK, LLK-Auto, LLK-B, QBH, *

Seam Tracking
Swiveling angle of focusing unit 200°
Useable Z stroke (tactile sensor, focus position):
- welding

- brazing

5 mm (10mm with
auto focus)
15 mm
Adjustable range of laser light cable receiver 360°

Wire Feeding System
Support for wire feeder On request, e.g. Binzel, Fronius
Suitable for hot wire up to 200 A

WxDxH, examples:
- PDT with integrated
  peripheral equipment
- PDT in compact

Approx. 800 mm x 430 mm x 540 mm

Approx. 410 mm x 180 mm x 540 mm

Weight Approx. 11 - 25 kg (depending on configuration)

Electrical DC 24 V, 5 A, *
Pneumatics ≤1.0 MPa
Cross jet: ≤ 1.0 MPa, approx. 500 l/min @ 0.6 MPa
Shielding gas On request, approx. 5 - 40 l/min, 0.6 MPa
Cooling Flow rate 2 l/min, temperature 15 – 35 °C (avoiding condensation)
PLC / field bus system Hard wired, *

Subject to change without prior notice
*Others on request



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