Certified welding specialist for repair, cladding and special welding combined with mobile and stationary machining.
Zange Spezialschweissen GmbH
Grammetal / OT Nohra (Steinbrüchenstraße 10) · Grammetal / OT Ulla (branch)New on Amplifa
About Zange Spezialschweissen
Zange Spezialschweissen GmbH is a certified welding specialist based in Grammetal in Thuringia, near Weimar. Founded in 1992, the company specialises in repair welding, cladding, rebar welding, cast iron welding as well as prototype and single-part manufacturing. Its core competence is combining technologically sophisticated repair welding solutions with mobile machining (drilling, milling, turning, spindles, flange machining) directly on site – without disassembly and transport of the components. In addition, the company's own machine shop produces single parts and small series using conventional and NC machining. Materials machined include steel, stainless steels, aluminium, castings and rebar. Customers come from mechanical and plant engineering, steel and special machinery construction, the automotive and aviation industries, the cement, lime and heavy industries, shipbuilding as well as chemical and energy plant construction. Since 2023, the company has operated at the site Steinbrüchenstraße 10 in the UNO-Nohra industrial park; an assembly hall for workpieces up to 63 tonnes is planned for 2026.
- Site
- Grammetal / OT Nohra
- Processes
- Repair welding, Cladding, Rebar welding (DIN EN ISO 17660-1), Cast iron welding, Prototype construction and production welding, Mobile machining (drilling, milling, turning, spindles, flange machining), Machine shop (single parts and small series, conventional and NC machining), 3D laser measurement
- Materials
- Steel, Unalloyed steels (group 1.1, 1.2, 1.3 per CEN ISO/TR 15608), Stainless steels (group 8.1 per CEN ISO/TR 15608), Aluminium (groups 22, 23 per CEN ISO/TR 15608), Castings, Rebar, Steel (unalloyed, groups 1.1/1.2/1.3), Stainless steels
- Certificates
- DIN EN 1090-2 EXC 3 (steel), DIN EN 1090-3 EXC 2 (aluminium), DIN EN ISO 17660-1 (rebar welding), DIN EN ISO 3834-2:2021, DIN EN ISO 9001:2015, DIN EN ISO 9712 PT level 2, DIN EN ISO 9712 VT level 2 (visual testing), DIN 18800-7 (suitability qualification), DIN EN ISO 17660-1 (rebar), DIN 18800-7 suitability qualification, DIN EN ISO 9712 PT2/VT2 (personnel)
- Founded
- 1992
- Industries
- Mechanical & plant engineering, Steel construction & special machinery construction, Automotive & aviation industry, Cement, lime & heavy industry, Shipbuilding, Chemical & energy plant construction
- 01
Technology and materials consulting
- 02
Repair and special welding (E-Hand, MAG, flux-cored wire, WIG, CMT)
- 03
Material post-treatment (HIFIT/UIT, inductive preheating)
- 04
Machining, mobile or in the workshop
- 05
3D laser measurement and non-destructive testing (VT2, PT2)
- 06
Prototype and single-part manufacturing
Materials & Processes
Steel (unalloyed, groups 1.1/1.2/1.3)
Base material for repair, production and cladding in mechanical engineering and steel construction.
Stainless steels
Welding and repair work on corrosion-stressed components in chemical and energy plant construction.
Aluminium
Welding work to EN 1090-3 EXC 2 on aluminium load-bearing structures and lightweight components.
Castings
Cast iron welding for the repair of worn or damaged cast parts.
Rebar
Certified rebar welding to DIN EN ISO 17660-1 for reinforcement and rebar structures.
CMT process (cold metal transfer)
Low-heat welding process, in use since 2013, among other things for thin sheet metal and cladding.
HIFIT/UIT hammering process
Post-treatment of weld seam transitions to improve the fatigue strength of dynamically loaded structures.
NDT to DIN EN ISO 9712 (PT2, VT2)
Certified penetrant and visual testing of weld seams and components.
Locations
Grammetal / OT Nohra
DEMain site: certified welding specialist, machine shop, administration
- Part weight / size
- Machining up to 10 t in-house; boring mill up to 3000 kg
- Lot size
- Single parts and small series
- Materials
- Steel, stainless steel, aluminium, castings
- TOS W100A boring mill (X 1600 / Y 1120 / Z 1250 mm, 3000 kg)
- Servo-conventional drilling machine (drilling capacity 60 mm)
- Conventional lathe Ø 800/400 mm, L 4000 mm
- NC lathe Ø 800/630 mm, L 4000 mm
- Mitre band saws up to 500 x 400 mm
- HIFIT device (mobile and stationary)
Grammetal / OT Ulla
DEBranch (Im Dorfe 8)
Components & Services
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Repair weldingJoining | – | – | – | – | Steel, Stainless steel, Castings, Aluminium |
| CladdingSurface | – | – | – | – | – |
| Rebar welding (DIN EN ISO 17660-1)Joining | – | – | – | – | Rebar |
| Cast iron weldingJoining | – | – | – | – | Castings |
| Prototype construction and production weldingJoining | – | – | – | – | – |
| Mobile machining (drilling, milling, turning, spindles, flange machining)Machining | Tolerances in the hundredth range | – | – | – | – |
| Machine shop (single parts and small series, conventional and NC machining)Machining | – | – | up to 10 t (in-house machining) | – | – |
| 3D laser measurementTesting | – | – | – | – | – |
| HIFIT process / UIT process (high-frequency hammering process, post-treatment ofForming | – | – | – | – | Steel, Aluminium |
| Laser weldingJoining | – | – | – | – | – |
| CMT process (cold metal transfer)Joining | – | – | – | – | – |
| Inductive preheatingHeat treatment | – | – | – | – | – |
| Welding processes 111 (E-Hand), 131 (MAG), 135, 136 (Fülldraht), 141 (WIG) to DIN EN ISO 4063Joining | – | – | – | – | Steel (1.1, 1.2, 1.3), Stainless steel (8.1), Aluminium (22, 23) |
| Penetrant testing (PT) level 2 to DIN EN ISO 9712Testing | – | – | – | – | – |
| Visual testing (VT2) to DIN EN ISO 9712Testing | – | – | – | – | – |
| Welding technology consultingEngineering | – | – | – | – | – |
| Engineering consulting on design and materialsEngineering | – | – | – | – | – |
| Assembly (planned assembly hall for workpieces up to 63 tonnes, 2026)Assembly | – | – | 63 t (planned) | – | – |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Boring mill, conventional | TOS W100A | – | X 1600 mm, Y 1120 mm, Z 1250 mm, workpiece weight 3000 kg | – | Grammetal/Nohra |
| Drilling machine (servo-conventional) | – | – | Drilling capacity 60 mm | – | Grammetal/Nohra |
| Lathe, conventional | – | – | Ø 800/400 mm, L 4000 mm | – | Grammetal/Nohra |
| NC lathe | – | – | Ø 800/630 mm, L 4000 mm | – | Grammetal/Nohra |
| Mitre band saws | – | – | Maximum workpiece dimension 500 x 400 mm | – | Grammetal/Nohra |
| HIFIT device (high-frequency hammering process) | – | – | – | – | Grammetal/Nohra, mobile |
Additional services
Quality & Certification
The quality management system is certified to DIN EN ISO 9001:2015; the company meets the welding-related requirements according to DIN EN ISO 3834-2. Its own personnel is certified to DIN EN ISO 9712 for penetrant testing (PT2) and visual testing (VT2), complemented by 3D laser measurement.
| Evidence | Grammetal / OT Nohra |
|---|---|
| DIN EN ISO 9001:2015 | |
| DIN EN ISO 3834-2:2021 | |
| DIN EN 1090-2 EXC 3 (steel) | |
| DIN EN 1090-3 EXC 2 (aluminium) | |
| DIN EN ISO 17660-1 (rebar) | |
| DIN 18800-7 suitability qualification | |
| DIN EN ISO 9712 PT2/VT2 (personnel) |
History
- 1992
Founded with one employee; major suitability qualification DIN 18800 Part 7-1991.
- 1996
Introduction of mobile machining.
- 1998
Approval by the automotive industry for special welding processes.
- 2001
Welding supervision rebar.
- 2002
Suitability qualification for rebar welding DIN EN ISO 17660-1 (formerly DIN 4099).
- 2010
Introduction of inductive preheating.
- 2013
Application of the CMT process; certification of the management system to DIN EN ISO 9001; establishment of the HIFIT/UIT process.
- 2015
Certification to EN 1090-2 EXC 3 (steel) and EN 1090-3 EXC 2 (aluminium).
- 2023
Relocation to the larger site Steinbrüchenstraße 10 in the UNO-Nohra industrial park.
- 2026
Planned: new assembly hall for workpieces up to 63 tonnes.