Cost-effective, flexible and versatile


Technical details of the welding process

The penwelder is operated exclusively in the pulsed deep welding process. Work is carried out without filler material, which is why a technical zero gap is required. This means that the joining gap must not exceed 10% of the material thickness, but not greater than 0.15-0.2 mm. During deep welding, the laser beam not only melts the metal but also forms a deep, narrow, steam-filled hole – the so-called steam capillary – or keyhole. The metal melt flows around this steam capillary and solidifies at its back. In this way, a narrow, deep weld seam is formed with a uniform structure and a high strength. Basically, this welding process is characterized by high efficiency and high welding speeds. The heat input is very focused, resulting in low distortion or low start-up colours. In addition, many materials that are considered non-weldable become weldable.



  • Little to no delay of the component due to pinpoint, precise energy input
  • Can be used immediately, no training necessary
  • Flexible – even for intricate seam geometries
  • Integrated protective gas supply
  • Lunker-free welds
  • Pulsed operation with welding depth up to 2mm
  • Minimal effort in rework


  • Stainless steel
  • Titan
  • Black steel
  • Aluminum

“Since 2014, we have been using the penwelder of Bluelasertools GmbH in our company. We use it to stitch workpieces made of VA and steel in material thicknesses of 1 to 5 mm, which are then welded ready in the robot cell. The system runs smoothly, handling and handling with the penwelder is hassle-free. The system is highly flexible and allows us to do without expensive devices and the set-up times for changing assemblies are zero as a result.”

Rudolf Riegel, Technical Director ELEKTROR

Finetuning the welding result

In pulsed mode, depending on the power of the laser source, we can set 3 parameters:

(1) the peak pulse power, (2) the pulse duration, and (3) the pulse frequency.

These parameters determine the welding result in terms of welding penetration depth, maximum welding speed and seam surface. Furthermore, the beam shape can be adjusted via the infinitely variable focus setting.

  • average laser power up to max 500 W
  • Pulse duration 1 to 50 ms
  • Peak pulse power 3000-4000 W
  • welding speed max. 4m/min
  • welding depth max. 3mm
penwelder demo

Want to test the Penwelder exclusively in your company for one day?

Anytime! We are happy to make an appointment for trial welding in your company at short notice. We work on your components and your employees can get an immediate picture of the advantages of the penwelder.

  • This field is for validation purposes and should be left unchanged.