
Waterjet cutting stationary and mobile, welding work and special metal construction for repair and custom fabrication.

Joachim H. Karstens Watercut & Welding
Kröppelshagen (Wohltorfer Weg 25, 21529)New on Amplifa
About Karstens Watercut & Welding
Karstens Watercut & Welding is a specialist company in metal construction based in Kröppelshagen near Hamburg. The company specialises in waterjet cutting (stationary up to 4,000 × 2,000 mm as well as mobile), welding work (MIG/MAG, TIG, spot welding) and special metal construction with design engineering. A focus is mobile cutting, drilling and welding technologies for dismantling and repair, such as the material-preserving, spark-free production of flat surfaces and boreholes up to 600 mm in steel, the splitting of shafts or the creation of inspection and access openings. Steel and other metals are the main materials processed. References include the repair of the cable wheel bearings of the Rethe bascule bridge in the Port of Hamburg for the Hamburg Port Authority (2009). The company works for metal construction, port and maritime technology, bridge refurbishment, the ordnance clearance sector as well as private customers (including custom hunting seats and special fabrications via waterjet cutting). It is available with 24/7 standby service.
- Site
- Kröppelshagen
- Processes
- Waterjet cutting, Mobile waterjet cutting, Mobile drilling technology (boreholes up to 600 mm in steel), Mobile production of flat surfaces, Splitting of shafts, Welding work (MIG/MAG), TIG welding, Spot welding
- Materials
- Steel, Metals, Stainless steel
- Certificates
- Certifications
- Industries
- Metal construction, Port and maritime technology, Bridge construction/refurbishment, Ordnance clearance, Construction machinery, Hunting/private customers
- 01
Design engineering
- 02
Waterjet cutting
- 03
Sawing/Punching/Shearing/Bending
- 04
Turning/Milling/Drilling
- 05
Welding
- 06
Pickling
- 07
Special metal construction & Assembly
- 08
Mobile on-site repair
Materials & Processes
Steel
Main material for waterjet cutting, mobile cutting and drilling up to 600 mm as well as welding work.
Metals
Processing of various metals in waterjet cutting, sawing, turning, milling and welding.
Stainless steel
Pickling system (TIG Brush) for the surface post-treatment of stainless steel.
Locations & Facilities

Kröppelshagen
DEHeadquarters / Workshop
- Materials
- Steel, metals, stainless steel
- Waterjet cutting machine Waterjet 4.000 × 2.000 mm
- Automatic bandsaw MEP Shark 331 NC 5.0 Spider (330 × 280 mm)
- Bandsaw MEP (280 × 240 mm)
- Punching machine Peddinghaus 60 tm
- Press brake ERMAK 175 t / 3.100 mm
- Swing beam shear ERMAK 6 mm / 3.200 mm
- Pickling system TIG Brush
- Drilling machine Hille MK 5
- Lathe Julius Lang, 900 mm between centres
- Conventional milling machine 300 × 200 mm
- Welding machines EWM, MIG O MAT, Elektron Multispot M8

Mobile (Customer deployment)
DEMobile cutting, drilling and welding technology for dismantling and repair
- Materials
- Steel
- Mobile waterjet cutting system ANT Mace
- Mobile welding unit EWM PICOTIG HF
Components & Projects











Inside the production








Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Waterjet cuttingMachining | – | 4000 mm × 2000 mm | – | – | Steel, Metals |
| Mobile waterjet cuttingMachining | – | – | – | – | Steel |
| Mobile drilling technology (boreholes up to 600 mm in steel)Machining | – | – | – | – | Steel |
| Mobile production of flat surfacesMachining | – | – | – | – | Steel |
| Splitting of shaftsMachining | – | – | – | – | Steel |
| Welding work (MIG/MAG)Joining | – | – | – | – | Metals |
| TIG weldingJoining | – | – | – | – | Metals |
| Spot weldingJoining | – | – | – | – | Metals |
| Special metal construction / Design engineeringAssembly | – | – | – | – | Metals |
| BendingForming | – | 3100 mm | – | – | Steel, Metals |
| PunchingForming | – | – | 60 t | – | Steel, Metals |
| Shear cuttingForming | – | 3200 mm | – | – | Steel, Metals |
| Sawing (bandsaw)Machining | – | – | – | – | Metals |
| TurningMachining | – | 900 mm | – | – | Metals |
| Milling (conventional)Machining | – | 300 mm × 200 mm | – | – | Metals |
| Drilling (drilling machine)Machining | – | – | – | – | Metals |
| PicklingSurface | – | – | – | – | Stainless steel |
21 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Waterjet cutting machine | Waterjet | – | 4.000 x 2.000 mm | – | Kröppelshagen |
| Mobile waterjet cutting system | ANT Applied New Technologies AG Mace | – | – | – | mobile |
| Automatic bandsaw | MEP Shark 331 NC 5.0 Spider | – | 330 x 280 mm | – | Kröppelshagen |
| Bandsaw | MEP | – | 280 x 240 mm | – | Kröppelshagen |
| Punching machine | Peddinghaus | – | 60 tm | – | Kröppelshagen |
| Press brake | ERMAK | – | 175 t, 3100 mm | – | Kröppelshagen |
| Swing beam shear | ERMAK | – | 6 mm, 3200 mm | – | Kröppelshagen |
| Pickling system | TIG Brush | – | – | – | Kröppelshagen |
| Drilling machine | Hille | – | MK 5 | – | Kröppelshagen |
| Lathe | Julius Lang | – | 900 mm between centres | – | Kröppelshagen |
| Milling machine, conventional | – | – | 300 x 200 mm | – | Kröppelshagen |
| MIG/MAG inverter welding machine | EWM 400 Phönix | – | – | – | Kröppelshagen |
| MIG/MAG inverter welding machine | EWM 400 Phönix Evolution | – | – | – | Kröppelshagen |
| MIG/MAG welding machine | MIG O MAT 350 | – | – | – | Kröppelshagen |
| MAG welding machine | MIG O MAT 250 | – | – | – | Kröppelshagen |
| MAG welding machine | MIG O MAT 250i | – | – | – | Kröppelshagen |
| TIG inverter welding machine | EWM 350 Evolution | – | – | – | Kröppelshagen |
| TIG welding machine | MIG O MAT 230 | – | – | – | Kröppelshagen |
| TIG inverter welding machine | EWM 160 | – | – | – | Kröppelshagen |
| Mobile welding unit | EWM PICOTIG HF | – | – | – | mobile |
| Spot welding machine | Elektron Multispot M8 | – | – | – | Kröppelshagen |
Additional services
Reference customers
Quality
The work is carried out in a material-preserving manner, without sparks, open flame or high heat input; projects such as the Rethe bascule bridge were confirmed by the Hamburg Port Authority. Certificates are not published.
| Evidence | Kröppelshagen |
|---|---|
| Certifications |
History
- 2009
Repair of the cable wheel bearings of the Rethe bascule bridge in the Port of Hamburg using an innovative process; recommissioning on 06.02.2009