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Precision-engineered consumables and accessories designed for professional aluminothermic rail welding operations across all rail types and environments.
Thermit welding — also known as aluminothermic welding — is the dominant field-welding method for joining railway rails worldwide. The process harnesses an exothermic chemical reaction between aluminum powder and iron oxide to produce molten steel at temperatures exceeding 2,500°C, which flows into a precision sand mould to form a metallurgically sound joint between two rail ends.
A thermit welding portion is the complete set of consumable materials required to perform a single rail joint weld: the thermite reaction charge, sand mould, luting sand, crucible cap, mould clamps, and ignition components. Each element is engineered to exacting tolerances, because even minor deviations in chemistry or geometry can compromise joint integrity, ride quality, and long-term fatigue life.
Over 80% of all field rail joints globally are produced using aluminothermic welding. With more than 1.5 million thermit welds performed every year across mainline, metro, crane rail, and industrial track applications, the quality of welding portions is directly linked to railway safety and operational efficiency.
The global thermit welding consumables market has expanded significantly over the past decade, driven by record infrastructure investment in Asia, the Middle East, Africa, and Latin America. High-speed rail corridors, urban metro expansions, and port logistics upgrades have collectively created an unprecedented demand for reliable, repeatable rail joining solutions.
China alone has constructed more than 45,000 km of high-speed rail since 2008, each kilometre requiring hundreds of precision welds. Southeast Asia's rapid urbanisation has triggered a wave of metro projects from Jakarta to Manila. Meanwhile, Africa's mineral export corridors — from Mozambique's Nacala Corridor to South Africa's heavy-haul lines — demand welds that endure extreme axle loads and temperature cycles.
Against this backdrop, manufacturers who can supply certified, traceable thermit welding portions at scale — while offering technical support and on-site training — have become strategic partners rather than simple component suppliers.
Next-generation thermite charges incorporate rare-earth micro-alloying to improve weld toughness, reduce porosity, and extend fatigue life — critical for 350 km/h high-speed operations.
Portions formulated for extreme climates — from Arctic permafrost (-50°C) to tropical humidity — are in growing demand as rail networks expand into previously underdeveloped regions.
Robotic preheating and automated pouring systems are being integrated with standardised portions to reduce human error and deliver consistent joint quality across large-scale projects.
Biodegradable and low-emission sand mould binders are replacing traditional furan resins, responding to tightening environmental regulations across the EU and East Asia.
Each welding portion is now increasingly tagged with QR codes or RFID chips, enabling full lifecycle traceability from manufacturing batch to in-service weld inspection records.
Leading manufacturers partner with universities and national rail laboratories to validate new portion formulations under real-world dynamic loading, accelerating certification timelines.
Mainline Track Repair: When a rail section suffers fatigue cracking, head checking, or impact damage, the damaged segment must be cut out and replaced with a new insert welded at both ends. Thermit welding portions designed for mainline use must tolerate high dynamic loads (up to 30-tonne axle weights) and deliver a weld hardness matching the parent rail steel to prevent differential wear.
Metro & Urban Transit: Underground metro environments impose unique constraints — confined headroom, ventilation limitations, and strict noise/fume regulations. Compact, low-smoke thermit portions with fast reaction cycles allow maintenance windows as short as 90 minutes, minimising service disruption. The tight curves of metro alignments also require mould geometries adapted for curved rail sections.
Crane Rails in Industrial Facilities: Overhead crane rails in steel mills, shipyards, and container terminals endure vertical impact loads and lateral forces that exceed those of conventional rail. Thermit welding portions for crane rail applications use higher-carbon alloy charges to match the hardness of crane rail grades (e.g., A65, A75, A100), ensuring weld longevity in punishing industrial cycles.
Seaport & Logistics Infrastructure: Coastal environments combine salt-laden air, variable temperatures, and the vibration of heavy container-handling equipment. Portions with corrosion-resistant alloying and robust mould sealing compounds (luting sand) are essential to prevent premature joint degradation and maintain smooth cargo flow.
Mining & Heavy-Haul Railways: Mining operations in Australia, Brazil, and West Africa run trains exceeding 40,000 tonnes gross weight. Thermit welding portions for these applications must produce welds with exceptional fracture toughness and fatigue resistance, often certified to proprietary mining-company standards more stringent than national codes.
RMTS is a manufacturer specializing in railroad thermit welding materials, based in Tianjin, China. With a factory spanning 5,500+㎡ and 30+ professionals dedicated, we are committed to delivering reliable and efficient thermit welding solutions to clients across the globe. Our products are designed to meet the highest industry standards, ensuring durability and performance in various applications.
We understand that successful welding projects require not only high quality products but also expertise and knowledge. That's why we offer comprehensive on-site training programs to help our clients master the thermit welding process, enabling them to achieve optimal results and build a strong reputation in their respective fields.
Driven by a customer-centric approach, RMTS is dedicated to fostering long-term partnerships by delivering exceptional products and services tailored to the unique needs of our clients. Whether you are looking for reliable thermit welding materials, expert training, or project support, RMTS is your trusted partner in achieving welding excellence.
RMTS combines cutting-edge research with real-world railway project experience to deliver thermit welding portions that consistently exceed industry benchmarks.
RMTS have a highly skilled R&D team that works tirelessly to ensure that we produce thermit welding materials that meet the specific needs of each type of rail.
In addition to its strong R&D capabilities, RMTS actively participates in railway projects across China and abroad, collaborating with railway authorities, construction companies, and maintenance organizations.
Whether in high-speed rail, urban transit systems, or conventional rail lines, RMTS offers its thermit welding materials and services to ensure the integrity and safety of rail infrastructure worldwide.
RMTS maintains partnerships with research institutions, universities, and industry experts in China. These collaborations enable RMTS to continuously strengthen its R&D capabilities in thermit welding technologies.
RMTS's strong R&D abilities, coupled with its involvement in railway projects, demonstrate the company's commitment to providing advanced thermit welding solutions that meet the specific demands of the railway industry.
RMTS thermit welding portions serve a diverse spectrum of rail environments — from high-speed mainlines to industrial crane rails and seaport logistics systems.
Ensures seamless rail joints, providing durable connections, which are critical for maintaining the safety of railway networks.
Widely used in the welding of crane rails due to its efficiency, reliability, and ability to create strong, durable joints.
Ideal for the confined spaces and tight schedules of metro rail construction and maintenance.
RMTS's aluminothermic welding technology ensures smooth and reliable joints for cargo handling operations.
Real-world evidence of RMTS thermit welding portions delivering performance, safety, and reliability across three continents.
As part of the Phase 2 expansion of Jakarta's Mass Rapid Transit (MRT) system, RMTS was contracted to provide aluminothermic welding solutions for the new underground and elevated tracks. The project involved welding 600 rail joints across a 12-kilometer stretch, connecting key areas of the city to reduce traffic congestion.
Our team worked closely with PT MRT Jakarta to ensure the welds met international safety standards. The project was completed on time, and the new line has been operating smoothly since its launch. Jakarta MRT officials highlighted the durability of the welds, which have withstood the high frequency of train movements and tropical weather conditions.
Challenge: The client faced the challenge of welding materials for T62 and P65 rails. The welding process needed to meet the rigorous standards set by the railway authorities, ensuring optimal track performance, longevity, and safety.
Solution: Our team collaborated closely with the client, thoroughly understanding their specific requirements. We provided high-quality thermit welding materials, including welding kits tailored to suit the T62 and P65 steel rail specifications.
Customer Satisfaction: The client expressed utmost satisfaction with our thermit welding materials. They acknowledged the superior quality, reliability, and technical support provided by our team — enabling them to deliver high-quality rail construction projects that meet the demands of the Russian railway industry.
Objective: Selecting a Qualified Supplier for Aluminum Thermit Welding Technology.
KTMB Railways aimed to improve connectivity across the city's suburbs. RMTS was selected as the most trusted supplier, providing 1,000 aluminothermic welding materials for new tracks including both underground and elevated sections. The project required precise welding to ensure smooth and safe operations, serving millions of passengers annually.
RMTS's welding materials were chosen for their ability to create strong, seamless joints that could withstand the humid climate and heavy usage. The project was completed ahead of schedule, and the new line has significantly reduced travel times for commuters.
Every component in the RMTS range is precision-manufactured and quality-certified — ensuring your track repair operations achieve first-time weld success, every time.
