Weldotherm WR 10,5 Inverter Heat Treatment Unit
Single-channel inverter unit for preheating and post-weld heat treatment
The Weldotherm WR 10,5 is a compact, one-channel resistance heat treatment unit built around an inverter power stage. At about 18 kg in a case the size of a pilot’s bag, it is aimed at small repairs, single joints and heat treatment in confined or hard-to-reach areas, where a multi-channel console would be impractical. The datasheet lists order number 103100.
Its output voltage is adjustable from 24 to 65 VDC in 1 V steps. That lets the unit drive heating elements of standard voltages as well as custom-built elements with intermediate voltages, provided the element stays within the current limits below. An integrated program controller and data logger make the unit self-contained for programmed heating, holding and cooling cycles.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / model | Weldotherm / WR 10,5 |
| Order no. | 103100 |
| Heating channels | 1 |
| Output voltage | 24–65 VDC, adjustable in 1 V steps (automatic and manual operation) |
| Output current | Max. 180 A at 60 VDC; max. 160 A at 65 VDC |
| Power output | Max. 10.8 kVA |
| Thermocouple inputs | 1 × Type K |
| Program controller | Integrated, 6 front buttons |
| Stored programs | 49 in total: 0 manual, 1 Easy Prog, 2–49 with 49 segments each |
| Display | 3 × 4-digit (SV, PV, parameter); 6 status and alarm LEDs |
| Measuring / control range | −40 to 1350 °C / −25 to 1200 °C |
| Accuracy | ±0.3% of measuring range ±1 digit |
| Data logger | Set-point, process value, output voltage, output current, status |
| Mains supply | 3PE, 400 V, 50/60 Hz, 18 A |
| Fusing internal / external | 25 A / 32 A |
| Mains cable | Power switch on rear, 3 m connection cable |
| Dimensions (H × W × D) | 410 × 170 × 500 mm |
| Weight | 18.2 kg |
| Ambient conditions | −20 to 40 °C |
| Protection | IP21 |
| Accessories supplied | CD with user guide and PC software; WR 10,5 USB adapter cable |
Planning a heat treatment set-up
The WR 10,5 controls one zone from one Type K thermocouple. A complete set therefore needs a heating element matched to the joint geometry, power cables to the element, the thermocouple with its attachment method and compensating cable, and insulation over the heated area. These items are not part of the unit and should be specified separately.
When choosing an element, check both limits: the current at the selected voltage must stay within 180 A at 60 VDC or 160 A at 65 VDC, and the total load must remain within 10.8 kVA. On site, the unit needs a 400 V three-phase supply with protective earth and 32 A external fusing. Its IP21 rating and −20 to 40 °C ambient range mean it should be sheltered from rain, dust and direct sun during outdoor work.
Status messages and alarms are shown on the six front LEDs and also signalled acoustically, while the three four-digit displays show the set-point, the process value and a selected parameter during the cycle. Recorded data can be transferred to a PC with the supplied software and USB adapter cable, for example to document the cycle in a heat treatment report.
For several joints at once, or for heater ports at fixed 30 V and 60 V, Weldotherm’s multi-channel STANDARD EUROPA and VAS series are the alternatives within the same product line.
Documents and quotation
The Weldotherm WR 10,5 datasheet (revision 04-2025) is attached under the documents tab. Browse Induction Heating & Preheating for related equipment such as the Miller ProHeat 35 induction heating system.
For a quotation, send the order number, quantity, site supply data, and the heating elements, cables, thermocouples and insulation you want included.
- Datasheet Weldotherm WR 10,5 datasheet (rev. 04-2025) Download
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