Weldotherm

What Weldotherm does

Weldotherm GmbH (legal name: WELDOTHERM Gesellschaft für Wärmetechnik m.b.H.) is a privately held German manufacturer of industrial heat treatment equipment, founded in 1984 and headquartered in Essen. The company specializes in mobile and stationary controlled heat treatment technology — including fully automatic program-controlled annealing units (Glühanlagen), resistance and induction heating systems, heating elements (mats, tapes, cables, channel heaters, inductors), temperature measurement and control technology (DIGIT 700, TC-80 controllers; RSG 35, AL4706 recorders), thermocouples, and a broad accessories and consumables portfolio. Its technology targets preheating, post-weld heat treatment, and stress relief annealing for welds, pipelines, pressure vessels, and forgings across power plant, heavy industrial fabrication, and metalworking applications.

Weldotherm sells primarily through a B2B enterprise direct-sales model supported by a multilingual website (German, English, Russian) with downloadable product catalogs and a product-inquiry workflow. The company operates four wholly-owned offices in Germany (headquarters), Russia (Moscow), Ukraine (Kalush), and Hungary (Ajka), and participates in major industry trade fairs such as SCHWEISSEN & SCHNEIDEN. Distribution is supplemented by a channel partnership with LAC (LAC Furnaces) and a network of regional partners.

The revenue model is a mix of one-time capital equipment sales (units, furnaces, special constructions), usage-based equipment rental (fleet of 100+ equipped units for preheating and post-weld heat treatment), recurring consumables and spare parts, and professional services (maintenance, repair, training, calibrations, EMC measurements, on-site heat treatment, and thermal calculations). Pricing is quote-based and not publicly disclosed. Two managing directors — Dipl.-Kfm. (FH) Simon Ingenillem and Dipl.-Kfm. Michael Schink — lead the company, which holds TÜV SÜD ISO 9001 and ISO 14001 certifications and is GDPR-compliant.

Name

Weldotherm

Legal name

WELDOTHERM Gesellschaft für Wärmetechnik m.b.H.

Website

https://weldotherm.com

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

11–50 employees

Short description

Weldotherm is a German industrial manufacturer of mobile and stationary heat treatment equipment — annealing units, heating elements, and temperature control systems — serving power plants, heavy fabrication, and metalworking customers across Europe.

Ownership category

akta.pro rank

Product category

Industrial Heat Treatment Equipment

NAICS

Industrial Process Furnace and Oven Manufacturing (333994), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Industrial Process Furnaces & Ovens (3567), Heating Equip, Except Elec & Warm Air; & Plumbing Fixtures (3430), Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro industry

PRIMARYIMAHADAI

Heat Treatment & Thermal Processing Furnaces (Hardening, Annealing, Induction)

Industrials, Manufacturing & Construction/Industrial Machinery & Heavy Equipment/Machine Tools & Metalworking Equipment

SECONDARYIMAHAKAD

Boilers, Furnaces & Process Heating Equipment

Industrials, Manufacturing & Construction/Industrial Machinery & Heavy Equipment/Refrigeration, HVAC & Thermal Equipment

SECONDARYIMAGAJAL

Thermal Management Components (Heat sinks, TIMs, fans/blowers, thermal pads)

Industrials, Manufacturing & Construction/Electrical Equipment & Industrial Electronics/Electronic Components for Industrial Applications (Passive/active components, industrial-grade modules)

SECONDARYIMAHAKAC

Heat Exchangers & Thermal Transfer Equipment

Industrials, Manufacturing & Construction/Industrial Machinery & Heavy Equipment/Refrigeration, HVAC & Thermal Equipment

Keywords

• Industrial heat treatment equipment
• Welding preheating systems
• Post-weld heat treatment
• Resistance and induction heating
• Temperature measurement and control

Headquarters

HQ city

Essen

HQ country

Germany

HQ region

Europe

Offices4 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Heat Treatment Equipment Sales: Sale of heat treatment units, annealing systems, furnaces, and associated equipment. Products include fully automatic program-controlled heat treatment units, industrial furnaces, and special custom constructions.
2. Heating Elements and Components: Sale of heating mats, heating tapes, heating cables, channel heaters, inductors, thermocouples, cables and accessories, and consumables/insulation materials.
3. Equipment Rental Services: Rental fleet with over 100 completely equipped units for preheating and post weld heat treatment applications. Customers perform work with their own staff.
4. Service and Maintenance: Maintenance and repair services, on-site heat treatment services using mobile resistance or induction units, calibrations, EMC measurements, and thermal calculations.
5. Training Services: Training courses for users on operation of heat treatment units, conducted at company facility in Germany or at customer site.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Weldotherm manufactures and supplies fully automatic program-controlled heat treatment units (Glühanlagen), a broad range of heating elements and inductors (heating mats, tapes, cables, channel heaters, magnetic preheaters, fixed and flexible inductors), and measurement/control technology (program controllers, temperature recorders, thermocouples, sensors) for controlled industrial heat treatment. The portfolio is rounded out with industrial furnaces (own and LAC lines), consumable insulations (ceramic fiber, rock wool, glass fiber), technical sprays, gloves, and special/custom constructions, together with services covering equipment rental, on-site heat treatment, maintenance and repair, training, thermal calculations, calibrations, and on-site EMC measurements.

Product overview

Weldotherm is a German industrial heat treatment technology company offering a comprehensive portfolio of mobile and stationary heat treatment solutions for controlled thermal processing of metals. The product ecosystem centers on Heat Treatment Units (Glühanlagen) as the core product line, supported by extensive accessories including Measuring and Control Technology (program controllers TC-80, DIGIT 700; temperature recorders RSG 35, AL4706, AH 4706/4712), Heating Elements and Inductors (heating mats, tapes, cables, preheaters, magnetic heating boxes, channel heaters, wraparound heaters, fixed and flexible inductors, coil inductors), Thermoelements and Temperature Sensors (thermocouples, surface sensors, measuring devices), and Cables and Accessories (power cables, compensating cables, splitter cables, junction boxes, thermocouple welders, welding machines, and fastening tools). Additional offerings include Consumables and Insulations (ceramic fiber, rock wool, glass fiber materials, fastening accessories), Furnaces (Weldotherm and LAC branded), Technical Sprays, Gloves, and Special Constructions. Services encompass rental of over 100 equipment units, maintenance and repair, training, thermal calculations, calibrations, on-site EMC measurements, and on-site heat treatment services.

Differentiator

Problem solved

Functional benefit

Products and services

• Heat Treatment Units (Glühanlagen) Serienmäßig vollautomatisch programmgesteuerte Glühanlagen (fully automatic, programme-controlled annealing/heat treatment units) in all performance sizes with varying numbers of control circuits, for controlled heat treatment of metals. Marketed to industrial customers performing welding preheating, post-weld heat treatment, and stress relief annealing.
• Program Controllers (TC-80, DIGIT 700) Programmable temperature controllers for industrial heat treatment processes. TC-80 is programmed via 5 function keys with dual 7-segment displays; DIGIT 700 can control three channels with one program and supports master/slave linking of multiple controllers. Used by Weldotherm customers to automate controlled heat treatment cycles.
• VAS DIGIT 700 Digital Measurement and Display Instrument Digital measurement and display instrument for monitoring industrial process and temperature values, featuring multiple displays and control elements for industrial heat treatment setups.
• Temperature Recorders (RSG 35, AL4706, AH 4706/4712) Electronic multilingual screen recorders for documenting heat treatment cycles with multiple channel recording, data storage on memory cards up to 1 GB, RS232/RS485 interfaces, and (on AH series) web browser data access. Models offer 4 to 12 channel recording widths, including 100 mm and 180 mm recording widths for precise evaluation.
• Heating Mats Extremely robust and durable flexible ceramic heating mats for industrial metal preheating, stress relief annealing, and local heat treatment of welds.
• Heating Tapes Flexible heating tapes that adapt to the shape of workpieces for varied industrial heat treatment applications.
• Spreader Mats Flexible expansion heating mats that deliver even heat to every desired point of the workpiece, used for circumferential welds and various shaped workpieces.
• One-Line and Two-Line Heating Cables Flexible, heat-resistant heating cables with outer sheath of austenitic wire mesh. Used for collector welds, flange connection welds and small pipes; two-line version rated to 1050 °C material temperature.
• Preheaters (30V / 60V) Preheaters with rear insulation of 25 mm ceramic fiber in Inconel wire mesh and stainless steel rear cover, used for circumferential welds and vessel seams.
• Magnetic Preheaters (30V / 60V) Magnetic preheaters equipped with high-temperature-resistant magnets and 25 mm ceramic fiber insulation in Inconel wire mesh, for circumferential welds and vessel seams.
• Magnetic Heating Boxes 60V Heating boxes with three high-temperature-resistant special magnets, 25 mm ceramic fiber insulation and stainless steel housing with handles, for targeted local heat treatment.
• Channel Heaters (30V / 60V / 230V) Stainless steel channel heaters in 30V, 60V, and 230V variants for annealing of collector floor welds, large circumferential welds, and other local heat treatment applications; 230V version rated to 850 °C material temperature.
• Wraparound Heater Heating sleeves for pipes from 2" to 48" diameter, with stainless steel outer jacket and ceramic fiber insulation, significantly reducing setup time for pipe heat treatment.
• Positioner for Inductors Device for adjusting the workpiece position relative to a fixed inductor, enabling precise alignment while the inductor remains stationary.
• Induction Cable ProHeat 35 Robust 35 kW induction cable designed for Miller ProHeat 35 systems, with improved resistance to mechanical and thermal stress.
• Air Flex Inductors Air-cooled inductors with special segmented design enabling contactless heating across a wide range of diameters.
• Fixed (Custom) Inductors Custom-designed stationary inductors for rotating preheating processes up to approximately 350 °C, featuring easy installation and durable materials.
• Coil Inductors (Water and Air Cooled) Water-cooled and air-cooled induction coil heaters for symmetrical, non-moving components such as pipelines and vessels. Water-cooled version rated up to 1500 A; air-cooled version rated 400-550 A with outer diameter 20 mm and length 15 m.
• Temperature Sensors and Thermocouples Surface temperature sensors, sliding and magnetic thermocouples, and Type-K thermocouple wires in 0.5 mm, 0.711 mm, and 1.0 mm diameters, used to capture and transmit workpiece temperature data to controllers and recorders; measuring devices include portable OF 305 for NiCr-Ni Type K thermocouples.
• Power and Compensating Cables Flame-retardant, oil-resistant power cables (water- and air-cooled) bridging the distance between induction heat treatment units and inductors; compensating cables for connecting Type K thermocouples to measurement displays. Includes splitter, twin, primary and series connection bridge cables.
• Inductive Junction Boxes (40kW/80kW, 160kW) Connection boxes for VAI Series induction power units with multiple power cable connections and up to 2 (40kW/80kW) or 3 (160kW) inductor outputs.
• Thermocouple Welders (TP 2N, TP 2S, TP 2.2 Duo) Welders for fast, secure attachment of thermocouple wires. TP 2.2 Duo fixes wires from 0.2 to 1.00 mm² with a built-in charge limiter and deep-discharge protection; TP 2N is suitable for 0.5, 0.7 and 1 mm wires; TP 2S is continuously adjustable from 0.1 to 1.8 mm with optional foot switch.
• Stud Welding Machine LBS 75 Positioning welding gun for fast welding of studs and insulation pins made of steel or stainless steel (V2A), diameters 2 to 8 mm.
• Ceramic Fiber Insulation Products Ceramic fiber mats in 13 mm, 25 mm and 50 mm thicknesses with density of 128 kg/m³ and application limit of 1200 °C, also supplied with stainless steel wire mesh protection; Hakotherm 1200 high-temperature insulation with chemical resistance and high mechanical strength.
• Rock Wool Insulation Standard rock wool insulation with galvanized wire mesh for local heat treatment, maximum application temperature 600 °C.
• Tygasil High-Temperature Insulation Silicon oxide fabric mat suitable for standalone insulation with continuous operating temperature up to 950 °C.
• Weldotherm Industrial Furnaces Weldotherm-branded industrial furnaces including annealing boxes for preheating and stress relief annealing of tool and die forgings, and preheating tables for slabs, used when workpieces can be moved into a furnace.
• LAC Industrial Furnaces High-quality industrial furnaces from LAC (LAC Furnaces) sold via Weldotherm as official sales partner for the represented region, characterized by durable materials and reliable heating technology.
• Special Constructions (Sonderkonstruktionen) Custom-designed special heating systems and constructions for workpieces too large, too complex, or too unique to be treated with standard products.
• Technical Sprays Technical sprays including cleaning agents, anti-corrosion sprays, and anti-spatter sprays for welding applications.
• Welding and Work Gloves Work and welding gloves, including soft leather work gloves, split cowhide leather gloves, and welding gloves with extended cuffs.
• Spare Parts Original and tested spare parts to ensure optimal performance and longevity of Weldotherm equipment.
• Rental Services Rental fleet of more than 100 completely equipped units for preheating and post-weld heat treatment applications; customers perform the work with their own staff.
• Maintenance and Repair Services Expert maintenance and repair of Weldotherm products performed by qualified specialists in the Weldotherm service workshop.
• Training Services Training courses for users on the operation of heat treatment units, delivered at the Weldotherm facility in Germany or at the customer site.
• Thermal Calculations Precise thermal calculations to ensure optimal heat treatment of components, drawing on many years of Weldotherm engineering experience.
• Calibration Services Calibration services for measuring equipment to ensure accurate temperature readings in heat treatment processes.
• On-Site EMC Measurements Professional on-site electromagnetic compatibility (EMC) measurements to ensure emissions and immunity compliance of heat treatment installations.
• On-Site Heat Treatment Services Expert supervision and execution of heat treatment jobs at customer sites using Weldotherm mobile resistance or induction units.

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• LAC (LAC Furnaces)coreChannel Partner/ Reseller/ DistributorOfficial sales partner for LAC furnaces in the represented region. LAC stoves are known for thoughtful design, durable materials, and reliable heating technology matching Weldotherm's commitment to excellence.
• Sealed ServicesminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• UNIQUE Heat Treatment ServicesminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• WIRPOminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• CEFIPminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• SPETSELEKTROODI ASminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• Weldotherm LtdminorOthersSubsidiary/affiliated company featured on Weldotherm website.
• Siliconi Commerciale SpAminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• ITE Co., LtdminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• GEOSUDminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• IdalminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.
• TratermeminorOthersPartner company featured on Weldotherm website. Nature of partnership not explicitly defined in available sources.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• SECO/WARWICK: Polish-based global supplier of industrial heat treatment furnaces and vacuum metallurgy equipment. Overlaps with Weldotherm's furnace business but operates at much larger scale across multiple thermal-processing categories.
• Heraeus Electro-Nite: Global supplier of temperature measurement and sensor technology for molten metal and industrial processes. Overlaps with Weldotherm's thermocouple and measurement instrument portfolio for metal processing.
• Despatch Industries: Manufacturer of thermal processing equipment including industrial ovens and furnaces. Competes in heat-treatment equipment categories overlapping Weldotherm's Glühanlagen and furnaces.
• Kanthal (Sandvik): Sandvik-owned supplier of heating elements and resistance materials used in industrial furnaces and heat treatment equipment. Adjacent supplier / competitor in the heating-elements category where Weldotherm sells its own mats, tapes, and cables.

Direct peers

• Inductotherm Group: Global manufacturer of induction heating equipment for forging, heat treatment, and melting. Directly comparable to Weldotherm's induction product line (Air Flex inductors, water-cooled coil inductors) and serves overlapping heavy industrial and forging customers.
• Ajax Tocco Magnethermic: Manufacturer of induction heating and heat treatment systems for automotive, forging, and energy applications. Competes head-to-head with Weldotherm in induction-based preheating and stress relief for heavy industry.
• LAC (LAC Furnaces): German industrial furnace manufacturer (already a Weldotherm sales partner). Competes in furnace-based annealing and stress relief for forgings and tool/die work, the same end market Weldotherm serves with its Sonderkonstruktionen line.
• EFD Induction (ITW Induction): Provider of induction heating solutions including heat treatment equipment for welds, shrink fitting, and brazing. Directly competes with Weldotherm's mobile induction heating units in power-plant and pipeline applications.
• Thermcraft: US-based manufacturer of industrial ovens, furnaces, and heat treatment equipment. Directly comparable product range — chamber furnaces, custom heat treatment systems — for similar industrial and laboratory customers.

Regional players

• Process Heating Company (PHC): North American provider of heat treatment services and equipment for weld preheating and post-weld heat treatment. Comparable service offering to Weldotherm's mobile on-site heat treatment business but focused on the US market.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/WeldothermGmbH
• LinkedInlinkedin.com/company/weldotherm

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Weldotherm