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K920Mobile Rail Welding Machines
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 K900A-1.
Applications
Mainline field welding
Continuous welded rail construction and track renewal.
Projects requiring 1,000 kN upsetting force.
Integration into mobile and containerised rail-welding systems.
Key Advantages
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.
Flash Removal
The replaceable-blade flash-removal unit removes flash 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 dimensions
1,600 × 1,195 × 1,030 mm
Welding head weight
3,200 kg
Maximum productivity
Up to 12 welds/h
Available Configurations
Welding Head
Welding head with integrated welding transformers/current-carrying assemblies, hydraulic clamping and upsetting mechanisms, flash-removal 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.
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.