Time and cost savings? Having bending and additional processes carried out by one party, saves valuable time and transport costs. It also means that curved constructions and/or semi-finished products delivered by Kersten  are ready to construct (install).

This means Kersten  is able to provide a total concept, from custom advice to engineering, prototyping and compiling a curved construction.

Kersten  works efficiently: for example, by carrying out everything under one roof, limiting residual materials to a minimum and saving on time and costs with the deployment of an off-line programming system.

Additional services at a glance:



To realize a good idea a translation is needed. Our engineers ensure that your desire is transformed into reality.


Cutting out sheet cut-outs

Gross plates are first cut to size and then rolled or set.  We cut sheets in various alloys with a surface of up to 16 x 4.5 meters and a thickness of 250 mm. The cutting is done on our cutting machines which are equipped with oxy fuel and plasma burners. The rotating 3D cutting head, if desired, applies complex welding edges in a uniform movement.

We aim to divide the gross sheet material as efficiently as possible, and if possible, making multiple unfolded patterns from one gross sheet. This restricts the number of residual materials to a minimum. Our engineers calculate exactly how much material is needed, taking into account any excess length.


(3D contour) cut to size

After the products are curved, excess length is removed using robot technology. These advanced robots realize (complex) 3D contours and/or bevels in the same movement. Holes and cut-outs can also be cut. This highly accurate process results in significant cost savings compared to conventional techniques. Off-line programming makes it ideal for small and medium series.

As well as 3D cutting of cylinders, cones, tubes and pipes, our robots make complex cuts in profiles such as IPEs, HEAs and UNPs. Kersten uses advanced plasma and oxy fuel cutting robots.



Drilling and milling

Save time and money by performing both bending and machining under one roof. For mechanical processing, we use modern CNC technology for things such as drilling and milling.


Welding procedures

Welding is carried out by a team of experienced, certified welders using modern welding equipment. This ensures the best end result. Kersten expertly performs welding activities on ferrous and non-ferrous alloys, varying from a simple longitudinal seam to a complete welded construction, including bottoms and accessories. It is also possible to have the activities inspected by a specialized body for being destructive (DO) or non-destructive (NDT).


Certified welding processes


  • Submerged arc - SAW (121-125) thickness ranges 3 mm - 200 mm (incl. PWHT)
  • MIG-MAG - GMAW-FCAW (131-135-136-138) thickness ranges 3 mm – 200 mm (incl. PWHT)
  • TIG - GTAW (141)
  • Submerged arc SAW TWIN (formerly process 123)


Kersten Germany:

  • MIG-MAG - GMAW-FCAW (135-136)
  • TIG - GTAW (141)


Welding method qualifications

Kersten Netherlands:

  • ISO 15614-1
  • AD Merkblatter
  • DNV Offshore standard OS-C401
  • EEMUA 158
  • Norsok M-101
  • AWS D.1.1D
  • IN 18.800-7 class E (Grosser Eignungsnachweis)
  • Welding procedure qualification in accordance with ASME and EN 15614-1
  • EN-ISO 3834-2
  • EN 1090 EXC 4
  • Punching certification according to 3.1 and 3.2 EN10204:2004


Kersten Germany:

  • CL1 Certificate according to DIN EN 15085-2
  • CL1 Certificate according to DIN EN 15085-2
  • DIN EN 1090-3 EXC 2 EG Certificate
  • EN-ISO 3834-2



Surface treatments

If required, we provide surface treatments such as anodizing, galvanizing, powder coating or painting of curved products.


Thermal treatment(s)

Kersten also offers thermal treatments such as soft annealing and aging of aluminium profiles.




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