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Explore our core product range engineered for precision rail welding and installation across all major rail environments.
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.
Additionally, our experienced team provides project welding instruction services, offering hands-on guidance and support to ensure seamless execution, no matter where the project is located.
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.
Rail welding technology stands at the heart of modern rail infrastructure, underpinning the safety, efficiency, and longevity of every railway system around the world. As global rail networks continue to expand — driven by urbanization, freight demand, and the push for sustainable transportation — the commercial and industrial significance of advanced rail welding solutions has never been greater.
Thermite (aluminothermic) welding remains the dominant field-welding method for rail joints worldwide, owing to its portability, cost-effectiveness, and ability to produce metallurgically sound welds without external power sources. Today, thermite welding is deployed across a diverse range of commercial and industrial contexts:
The rail welding industry is undergoing rapid transformation, driven by digitalization, materials science advances, and the demand for greener, safer infrastructure. Key trends include:
AI-assisted preheating control, automated mould positioning, and real-time quality monitoring are reducing human error and increasing weld consistency across large-scale projects.
Next-generation thermite powder formulations deliver higher tensile strength, improved fatigue resistance, and compatibility with premium rail grades including R350HT and R400HT.
Reduced-slag formulations and reusable tooling systems are minimizing environmental footprint, aligning with global sustainability mandates in infrastructure projects.
Ultrasonic testing, eddy current inspection, and digital weld documentation systems are becoming standard practice for HSR and metro projects demanding zero-defect performance.
High-speed rail networks operating at 250–350 km/h impose the most stringent weld quality requirements of any rail application. Surface irregularities at weld joints exceeding fractions of a millimeter can generate dynamic impact forces that accelerate rail fatigue and compromise passenger comfort. Thermite welding for HSR demands precisely engineered sand moulds, controlled preheating temperatures (typically 900–1000°C), and post-weld grinding to achieve surface profiles within ±0.3mm tolerance. RMTS's advanced thermite powder formulations are specifically designed to match the hardness and microstructure of premium HSR rail grades.
Urban rail projects present unique challenges: restricted working windows (often 2–4 hours overnight), limited site access, and the need to minimize noise and vibration for neighboring residents. One-shot crucible technology — a key RMTS innovation — enables rapid, single-use welding that eliminates crucible preparation time and reduces on-site labor, making it ideal for metro environments where speed and cleanliness are paramount.
Container terminals and steel plant crane rails endure some of the most severe loading conditions in the rail world — heavy wheel loads, frequent starts and stops, and often corrosive coastal environments. Thermite welds on crane rails must exhibit exceptional hardness and impact toughness. RMTS supplies specialized high-manganese thermite formulations and corrosion-resistant luting sands tailored for marine and industrial environments.
Maintenance-of-way (MOW) operations on busy mainlines require welding solutions that can be deployed rapidly during short track possession windows, often at night or on weekends. Mobile thermite welding kits, hydraulic rail tensioning machines, and precision rail cutting equipment from RMTS enable maintenance teams to complete high-quality welds efficiently, minimizing service disruption and maximizing track availability.
In remote mining operations where grid power is unavailable, thermite welding's self-contained exothermic reaction is uniquely advantageous. RMTS's portable welding kits, internal combustion rail cutting machines, and compact preheating equipment are designed for deployment in challenging off-grid environments, ensuring reliable rail connections regardless of location.
Understanding the thermite welding process is fundamental to appreciating the engineering precision behind every RMTS product. The process involves a carefully orchestrated sequence of preparation, ignition, casting, and finishing steps:
RMTS offers two proven crucible technologies to meet the diverse demands of rail installation projects worldwide.
Designed for maximum efficiency on metro, tram, and mainline rail installation projects. The one-shot crucible is pre-charged with thermite powder, eliminating on-site preparation and reducing the risk of contamination. Ideal for high-volume projects and restricted working windows, this technology delivers consistent, high-quality welds with minimal operator training requirements. Each crucible is used once and discarded, ensuring zero cross-contamination between welds.
Engineered for large-scale rail installation and maintenance projects where cost efficiency over extended campaigns is paramount. The long-life crucible withstands multiple thermite reactions, significantly reducing material costs on high-volume projects such as mainline renewals and industrial crane rail installations. Constructed from advanced refractory materials, it maintains dimensional stability and thermal integrity across hundreds of welds, making it the preferred choice for professional railway contractors.
Our main markets are in areas such as railway main lines, seaport crane rails, subways, trams, and high-speed railways. Aluminothermic welding plays a crucial role in these fields. No matter the scenario, RMTS welding technology, with its excellent performance, serves as a powerful support for promoting industry development and ensuring operational safety.
RMTS has 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, from standard carbon steel to premium hardened grades used in high-speed applications.
In addition to its strong R&D capabilities, RMTS actively participates in railway projects across China and abroad. The company collaborates with railway authorities, construction companies, and maintenance organizations to provide its expertise and materials for various projects.
By participating in railway projects, RMTS contributes to the development and maintenance of China's extensive railway network. 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 the rail infrastructure.
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 and stay at the forefront of global innovation.
Thermit portion, sand mould, luting sand, and ignitor are the main consumables for aluminothermic welding — 1 weld, 1 set of consumables.
For example: 10km project with 12.5m long rail — Calculation: 10,000 ÷ 12.5 × 2 = 1,600 sets
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.
Aluminum thermite welding, also known as aluminothermic welding or thermit welding, is a specialized welding technique that utilizes a chemical reaction to generate intense heat for joining rail components. Since its invention in the late 19th century, it has evolved into the world's most widely used field rail welding method, with continuous innovations in materials, tooling, and process control.
Preparation: Step 1 — Ensure the rail ends to be welded are clean, free from rust, and properly aligned. The gap size (space between two rails to be welded) shall be 26±2mm. Subsequent steps include mould assembly, preheating, ignition, casting, and precision finishing to achieve a structurally sound continuous weld.
Thermit welding materials will be failed with water. All welding materials should be kept away from any moisture in storage, as well as in the welding process. Operators must follow strict safety protocols including appropriate PPE, controlled ignition procedures, and post-weld inspection to ensure weld integrity and personnel safety.
Thermit welding, also known as aluminothermic welding, requires careful handling and storage of its materials to ensure safety and optimal performance. All thermite consumables must be stored in dry, cool conditions away from ignition sources, moisture, and incompatible materials. Proper labeling, segregation, and inventory rotation are essential for project-ready material management.
RMTS offers a wide range of thermit welding materials, such as welding kits, sand mould, one shot crucible/long life crucible, luting sand, and ignitor, ensuring consistent quality and reliable performance. Our complete solutions cover the entire rail welding workflow from surface preparation through to post-weld grinding and quality inspection.
RMTS provides comprehensive on-site training programs and project welding instruction services. Our experienced engineers offer hands-on guidance for teams across all skill levels, ensuring that every weld meets the required standards. We support projects from initial planning through to final quality verification, wherever in the world your project is located.
From thermite consumables to precision rail machinery, RMTS provides everything needed for professional rail installation and maintenance.
