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K920Mobile Rail Welding Machine
K920 is a mobile flash-butt rail welding machine for field welding of rails with a cross-sectional area of 6,500–10,000 mm². It supports continuous and pulsed flashing and immediate flash removal, with a higher force class than the K900.
Technology & System Architecture
K920 performs flash-butt welding with continuous or pulsed flashing. The programmed cycle controls heating, flashing and hydraulic upsetting for repeatable field welding.
Clamping & Alignment
Hydraulic clamping and upsetting are transmitted through the machine lever system. The clamping geometry is designed to maintain stable rail positioning during upsetting.
Removal of excess upset
Removal of excess upset immediately after welding around the rail profile. Side-blade adjustment allows the finished reinforcement to be set
Control & Quality
Siemens control architecture provides welding-process setting, actuator and electrical-system monitoring and real-time process information. WeldReg records welding-mode and joint data in supported configurations.
Cooling & Hydraulics
The machine uses a closed cooling circuit with coolant-flow monitoring. The complete machine includes the matched 21 MPa hydraulic system, pumping station and cooling equipment.
Technical Specifications
Rail cross-section
6,500–10,000 mm²
Mains voltage
380 / 400 V
Frequency
50 Hz
Maximum secondary current
67 kA
Continuous secondary current
24 kA
Short-circuit power
500 kVA
Power at 50% duty cycle
211 kVA
Rated upsetting force
1,000 kN
Clamping force
2,200 kN
Upsetting stroke
90 mm
Hydraulic pressure
210 bar
Welding head length
1,600 mm
Welding head width
1,195 mm
Welding head height
1,030 mm
Welding head weight
3,200 kg
Maximum productivity
Up to 12 welds/h
Key Advantages
Available Configurations
Welding Head
Welding head with integrated welding transformers/current-carrying assemblies, hydraulic clamping and upsetting mechanisms, removal of excess upset mechanism where applicable, and machine-side sensors, valves, actuators and connection points required for integration.
Complete Welding Machine
Everything included in the Welding Head configuration, plus the matched hydraulic pumping station, control cabinet and welding-process control system, cooling equipment, interconnecting power/control cables, hydraulic and cooling hoses, and required auxiliary equipment.
Containerised Solution
Complete Welding Machine integrated into a project-specific transportable system with hydraulics, cooling, control equipment, autonomous power generation where required, welding-head handling equipment, container infrastructure and project-specific safety systems.
Frequently Asked Questions
What is K920 designed for?
K920 is designed for field flash-butt welding of rails in the 6,500–10,000 mm² cross-section range.
Removal of excess upset after welding?
Yes. Removal of excess upset immediately after welding by the integrated replaceable-blade mechanism.
Can K920 be supplied in a container?
Yes. K920 can be integrated into a project-specific Containerised Rail Welding Solution.
What is K920 designed for?
K920 is designed for field flash-butt welding of rails in the 6,500–10,000 mm² cross-section range.
Does K920 remove flash after welding?
Yes. Flash is removed immediately after welding by the integrated replaceable-blade mechanism.
Can K920 be supplied in a container?
Yes. K920 can be integrated into a project-specific Containerised Rail Welding Solution.