INDUCTION HEATING MACHINE ( pwht)
Sigmaweld 40 kW PWHT System enables precise pre-weld and post-weld heat treatment using advanced induction technology. Designed for controlled pre-heating (100°C–300°C), post-heating (300°C–450°C), and stress relieving (450°C–760°C), it delivers uniform heating, reduced residual stress, and reliable weld integrity. Clean, energy-efficient, and safe — trusted since 1981.
Pioneers in Induction Heating Technology
Maximum Temperature
Up to 760°C
PWHT, stress relieving & normalizing applications
Rapid Heating
< 1.5 min to 150°C Significantly faster than flame or resistance heating
Energy Efficiency
70–90% Efficient
Direct induction heating into the metal
Safe & Clean Process
Flame-Free Heating
No soot, oxidation, or gas burner hazards
Temperature Accuracy
±5°C Precision
PLC-controlled heating with thermocouple feedback
Thermocouple Monitoring
Up to 6 Channels Simultaneous temperature logging
Technical Specificatins
| Parameter | Specification |
|---|---|
| Heating Technology | Induction Heating |
| Application | Pre-Weld, Post-Weld & PWHT |
| Maximum Temperature | Up to 760°C |
| Models Available | 5 kW – 200 kW |
| Power Supply | 3-Phase, 50 Hz |
| Temperature Accuracy | ±5°C |
| Heating Efficiency | 70–90% |
| Heating Time | < 1.5 min to 150°C |
| Control System | PLC-based Digital Control (HMI) |
| Thermocouples | Up to 6 channels |
Operating Modes & Pre-Programmed Cycles
Versatile control for every heating stage
Pre-&-Post weld Cycles
Optimized pre-heat, inter-pass temperature control, bake-out, and full PWHT cycles up to 760°C.
Intelligent Control Modes
Manual and temperature-controlled operation with PLC-based HMI for precise, automated heating.
Custom Cycle Programming
User-defined heating profiles with controlled heating, soaking, and cooling parameters.
WHY INDUCTION HEATING ?
Induction Heating
- High precision temperature control (±5°C)
- Flame-free operation for maximum safety
- 70–90% energy efficiency
- Fast and uniform heat distribution
- Clean process with no soot or oxidation
Flame heating
- Inconsistent temperature control
- Open flame poses safety hazards
- Less than 30% energy efficiency
- Slow and uneven heating
- Produces scale, soot, and surface contamination
APPliCATIONS
Pre-Weld Heating Applications
- Pipeline heating
- Long seam heating
- Circular seam heating
- Bucket tooth & plate preheating
- Stone crusher components
Post-Weld Heating Applications
- Nozzle Heating
- Normalizing Operations
- Circular seam heating
- Stress Relieving
- Pipeline heating
Industry Applications
- Power piping & P91 grade components
- Petrochemical plants
- Construction & repair pipelines
- Shipbuilding
- Heavy fabrication & shrink fitting
PHOTO gALLERY
