Steel and mechanical engineering company: construction machinery, tank and storage vessel manufacturing as well as contract manufacturing from steel and stainless steel
Diem-Werke GmbH
Hörbranz · Lochau (Plant II)New on Amplifa
Mechanical engineering, tank construction and plant engineering since 1949
Diem-Werke GmbH is a steel and mechanical engineering company founded in 1949 and based in Hörbranz, Vorarlberg, in the tri-border region of Austria–Germany–Switzerland. The company manufactures construction machinery and construction equipment such as forced-action mixers, tilting drum mixers, crane forks and crane buckets, custom tanks and pressure storage vessels up to 4.2 m in diameter and 20 t in weight, as well as systems and special machinery — from planning and design through to commissioning and on-site installation. In contract manufacturing, individual parts, assemblies and series are produced, with laser cutting up to 4 x 2 m, plasma cutting up to 12 x 3 m, roll bending, folding and welding processes from MAG to laser. Materials include steel, stainless steel, aluminium, brass and galvanized sheet metal. Around 50 employees produce on 7,000 m² of production space; reference customers come from structural and civil engineering, the refractory and food industries, energy and storage technology, and waste management and recycling.
- Site
- Hörbranz
- Processes
- Laser beam cutting (laser cutting), Plasma cutting, Rolling (roll bending), Folding, Welding (MAG, MIG, TIG, electrode, submerged arc, oxy-fuel, orbital, laser welding), Sawing, Turning, Milling
- Materials
- Steel (carbon steel), Stainless steel, Aluminium, Brass, Galvanized sheet metal, GRP (glass-fiber reinforced plastic, processed in customer fixtures), Laser cutting, Plasma cutting
- Certificates
- DIN EN ISO 9001, ISO 3834, EN 1090, ISO 9001
- Founded
- 1949
- Employees
- approx. 50 (accordin
- Industries
- Structural and civil engineering, Refractory industry, Food industry, Energy and infrastructure (district heating), Waste management/recycling, Storage technology
- 01
Sheet metal storage
- 02
Laser cutting / plasma cutting
- 03
Punching
- 04
Rolling / folding
- 05
Welding (incl. welding robotics)
- 06
Sawing / turning / milling
- 07
Deburring / grinding
- 08
Painting
- 09
Final assembly / on-site installation
- 10
Commissioning
Materials and manufacturing processes
Laser cutting
Bystronic laser cuts sheet formats up to 4 x 2 m: steel up to 20 mm, stainless steel up to 20 mm, aluminium up to 10 mm, brass up to 3 mm, galvanized sheet up to 4 mm.
Plasma cutting
Microstep plasma system processes formats up to 12 x 3 m, steel up to 35 mm thickness.
Steel (carbon steel)
Base material for contract manufacturing, construction machinery and tank construction, also galvanized.
Stainless steel
Used in tank and storage vessel construction as well as for corrosion-resistant system components.
Aluminium
Laser cut up to 10 mm and welded, also part of the contract manufacturing range.
Brass
Laser cut up to 3 mm as a contract manufacturing material.
GRP (glass-fiber reinforced plastic)
Processed in customer fixtures, e.g. winding mandrels for GRP pipe production.
Production sites
Hörbranz
ATHeadquarters with 7,000 m² production hall and administration building
- Part weight / size
- Components up to 20 t, up to Ø 4.2 m
- Lot size
- Single part to series production, standard storage vessels from 5 units
- Materials
- Steel, stainless steel, aluminium, brass, galvanized sheet metal
- Bystronic laser (sheet formats up to 4 x 2 m)
- Microstep plasma cutting system (up to 12 x 3 m)
- Four-roll bending machine (Ø 250 mm to 4.2 m, length up to 3.0 m)
- Folding press (up to 4 m length, 12 mm thickness)
- 7 welding robots
- Gantry/overhead crane 10 t
Lochau (Plant II)
ATConstruction machinery and storage warehouse (former Resch site, taken over in 2001)
Components and products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Laser beam cutting (laser cutting)Machining | – | 4 m × 2 m | – | – | Steel, Stainless steel, Aluminium, Brass, Galvanized sheet metal |
| Plasma cuttingMachining | – | 12 m × 3 m | – | – | Steel |
| Rolling (roll bending)Forming | – | 3.0 m × Diameter 250 mm to 4.2 m | – | – | Steel, Stainless steel, Aluminium |
| FoldingForming | – | 4 m × Thickness up to 12 mm | – | – | Steel, Stainless steel, Aluminium |
| Welding (MAG, MIG, TIG, electrode, submerged arc, oxy-fuel, orbital, laser welding)Joining | – | – | – | – | Steel, Aluminium, Stainless steel |
| SawingMachining | – | – | – | – | – |
| TurningMachining | – | – | – | – | – |
| MillingMachining | – | – | – | – | – |
| PunchingForming | – | – | – | – | – |
| DeburringSurface | – | – | – | – | – |
| GrindingSurface | – | – | – | – | – |
| Painting (incl. special painting to customer requirements)Surface | – | – | – | – | – |
| Final assembly (also on-site tank installation on customer premises)Assembly | – | – | – | – | – |
| Custom tank construction / storage technology (custom and standard storage vessels)Joining | – | 16 m × Diameter max. 4.2 m | 20 tonnes | Small series from 5 units (standard | Steel, Stainless steel |
| Plant engineering and special machinery construction (planning, design, implementation,Engineering | – | – | – | – | – |
| Contract manufacturing of individual parts, assemblies and seriesMachining | – | – | – | Single part – Series production | Steel, Stainless steel, Aluminium, Brass, Galvanized sheet metal |
| Manufacture of fixtures for GRP pipe production (winding mandrels Ø 2000–3600 mm, length 6500–8000Engineering | – | 8000 mm × Ø 3600 mm | – | – | – |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Laser Cutting Machine (laser cuts sheet formats up to 4 x 2 m) | Bystronic | 1 | Sheet formats up to 4 x 2 m | – | Hörbranz |
| Plasma cutting system | Microstep | 1 | Formats up to 12 x 3 m | – | Hörbranz |
| Four-roll bending machine | – | 1 | Diameter 250 mm to 4.2 m, length up to 3.0 m | – | Hörbranz |
| Folding press (folding up to 4 m length, 12 mm thickness) | – | – | Components up to 4 m length, thickness up to 12 mm | – | Hörbranz |
| Welding robot | – | 7 | – | – | Hörbranz |
| Gantry/overhead crane 10 tonnes (additional crane, 2025) | – | 1 | – | 2025 | Hörbranz |
Additional services
Reference customers
Quality and certification
Production is carried out in accordance with DIN EN ISO 9001, EN ISO 3834 and EN 1090. Trained and certified welders regularly complete welder qualifications; modern welding robotics ensure consistent quality.
| Evidence | Hörbranz |
|---|---|
| ISO 9001 | |
| ISO 3834 | |
| EN 1090 |
Company history
- 1949
Founded by Alfred Diem in Dornbirn as a craft business with one employee; first products made from metal scrap of the armaments industry
- 1950
International patents, series production of mixing machines
- 1955
First boiler bottoms for Hoval works Vaduz
- 1959
Development of the first concrete mixer with gear motor
- 1963
Relocation to Lochau
- 1987
Harry Diem takes over management
- 1994
Acquisition of a storage vessel manufacturing business
- 1995
First high-performance forced-action mixer DZ 120V series
- 2001
Acquisition of the warehouse and office space of the Resch site in Lochau (Plant II)
- 2004
Dynamic agitator for forced-action mixers
- 2009
Acquisition of Unitec Energietechnik GmbH
- 2010
Death of managing director Harry Diem
- 2012
Construction of the 7,000 m² production hall in Hörbranz
- 2013
Complete relocation to Hörbranz, certification to DIN EN ISO 9001 and ISO 3834
- 2014
Resumption of apprenticeship training in metal technology
- 2024
Ferdinand Diem joins the management
- 2025
Structural expansions: covered sheet metal storage, hall extension with additional 10-tonne crane