Specialist for Heat Treatment: Preheat, Stress Relieving, Furnace Heating mobile and stationary.
Weldotherm WTD Wärmetechnischer Dienst GmbH
Essen, Nordsternstraße 32New on Amplifa
About Weldotherm WTD
Weldotherm WTD Heat Technical Service GmbH specializes in the heat treatment of metal and steel components. The scope of services includes preheating for welding processes, post-weld heat treatment (PWHT), hydrogen annealing, normal annealing, auxiliary heating, drying of refractory concrete and masonry, and shrinkage stress relief. Processes are carried out using programmable resistance systems, induction systems, and high-speed gas burners; furnace heating is done stationary in the facility in Essen (10 m³ furnace, components up to 7 t) or mobile with modular annealing furnaces up to 1200 °C on site at the customer's premises. Additionally, the company offers planning, consulting, expert supervision, and construction management, including temperature documentation. Customers include industries, plant engineering, piping engineering, and structural steel construction; projects have been carried out worldwide. Location is Essen (Nordsternstraße 32).
- Site
- Essen
- Processes
- Resistance Annealing (Heat treatment with resistance systems and heating mats), Inductive Heating / Induction Annealing, Annealing with High-Speed Gas Burners (Gas Annealing process), Preheating (for welding processes), Post-Weld Heat Treatment (PWHT), Hydrogen Annealing, Normal Annealing, Auxiliary Heating
- Materials
- Steel, Metallic Materials (Metal), Refractory Concrete (Drying/Masonry), Steel Alloys, Refractory Concrete
- Certificates
- SCC-VAZ 2021, ISO 9001:2015, Exemption Certificate §48b EStG
- Founded
- 1974
- Industries
- Industry, Plant Engineering, Piping Engineering, Structural Steel Construction, Pharma, Pharma (Bayer Berlin location visible)
- 01
Planning & Consulting
- 02
Preheating / Auxiliary Heating
- 03
Welding Support
- 04
Heat Treatment (Resistance, Induction, Gas)
- 05
Furnace Heating (stationary or mobile furnace)
- 06
Temperature Documentation & Quality Control
- 07
Supervision / Construction Management
Materials & Processes
Steel
Main material for preheating, post-weld heat treatment (PWHT), and furnace heating of welded structures.
Steel Alloys
Special alloys require accompanying, process-safe preheating during welding.
Refractory Concrete
Drying of masonry and refractory concrete using gas burner technology.
Locations
Essen
DEHeadquarters and plant with stationary annealing furnace (In-House Annealing)
- Part weight / size
- Components up to 7 t
- Lot size
- Individual components and series of small parts
- Materials
- Steel, metallic materials
- Stationary Annealing Furnace 10 m³
- Resistance Systems 12–288 kW
- Induction Systems 40–160 kW
- High-Speed Gas Burners up to 1000 kW
- Hybrid Temperature Controllers (12 Channels)
- Modular Mobile Annealing Furnaces up to 1200 °C
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Resistance Annealing (Heat treatment with resistance systems and heating mats)Heat Treatment | – | – | – | – | Metal, Steel |
| Inductive Heating / Induction AnnealingHeat Treatment | – | – | – | – | Metal |
| Annealing with High-Speed Gas Burners (Gas Annealing process)Heat Treatment | – | – | – | – | Metal, Refractory Concrete (Drying) |
| Preheating (for welding processes)Heat Treatment | – | – | – | – | Steel, Steel Alloys |
| Post-Weld Heat Treatment (PWHT)Heat Treatment | – | – | – | – | Steel |
| Hydrogen AnnealingHeat Treatment | – | – | – | – | – |
| Normal AnnealingHeat Treatment | – | – | – | – | – |
| Auxiliary HeatingHeat Treatment | – | – | – | – | – |
| Drying / Drying of Masonry and Refractory ConcreteHeat Treatment | – | – | – | – | Refractory Concrete |
| Shrinkage Stress ReliefHeat Treatment | – | – | – | – | – |
| Furnace Heating (Complete Annealing, stationary In-House in Essen, 10 m³ furnace, components up toHeat Treatment | – | – | 7 t | – | Metal, Steel |
| Mobile Furnace Construction / Modular Mobile Annealing Furnaces (max. 1200 °C)Heat Treatment | – | – | – | – | Metal |
| Planning and Consulting of Heat Treatment and Welding ProcessesEngineering | – | – | – | – | – |
| Supervision / Expert Oversight and Construction Management on Site incl. DocumentationEngineering | – | – | – | – | – |
6 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Resistance System (programmable, mobile annealing system) | Weldotherm | – | Capacity 12–288 kW; 400V (63–188A); 2–12 Program Controllers/Circuits; Switching Current 90–360A per | – | Essen / mobile |
| Induction System with Inductors | Weldotherm | – | Capacity 40–160 kW; 400V (63–250A); Secondary voltage max. 500/1000 VAC; Secondary current max. | – | Essen / mobile |
| Gas Burner Cart (High-Speed Gas Burner) | Weldotherm | – | Natural gas power 1000 kW / Propane 800 kW; Working pressure 0.2 Bar; max. Temp. 1200 °C; Natural | – | mobile |
| Hybrid Temperature Controller | Weldotherm | – | 12 Channels; 100–240 VAC, 50/60 Hz; Documentation on paper and SD card | – | – |
| Stationary Annealing Furnace (10 m³) | – | 1 | 10 m³, components up to 7 t | – | Essen |
| Modular Mobile Annealing Furnace | Weldotherm | – | flexible adaptation to geometries, max. 1200 °C | – | mobile / worldwide |
Additional services
Reference customers
Quality & Certifications
Quality assurance is performed according to current DIN and DVS guidelines using hybrid temperature controllers (12 channels, analog and digital) for complete temperature documentation. The company is certified according to ISO 9001:2015 and SCC-VAZ 2021.
| Evidence | Essen |
|---|---|
| ISO 9001:2015 | |
| SCC-VAZ 2021 |
Company History
- 1974
Founding of the Heat Technical Service (Weldotherm).
- 1975
Establishment of a department for heat treatment work in WELDOTHERM company.
- 1995
Founding of Weldotherm Heat Technical Service (WTD) GmbH as a subsidiary of Weldotherm GmbH.
- 2005
Separation from Weldotherm GmbH; fully independent since then.