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Precision-engineered consumables and tooling designed to guarantee continuous metallurgical integrity, exact dimensional tolerances, and optimal joint longevity during rail line installation.
Continuous Welded Rail (CWR) has become the global benchmark for modern rail transportation, replacing bolted fishplate joints to eliminate impact vibrations, reduce rolling stock wear, and maximize high-speed traffic safety.
The Strategic Necessity of Continuous Welded Rail (CWR): In contemporary railway infrastructure, the mechanical bolted joint is historically the primary locus of track degradation, ballast pulverization, and fatigue failure. Under cyclic axle loads of up to 35-40 tons on heavy-haul freight corridors and continuous dynamic stresses on high-speed rail lines exceeding 350 km/h, mechanical rail joints require prohibitive maintenance overhead. Aluminothermic welding for rail installation serves as the most versatile, high-mobility, and cost-effective on-site joining technology, turning discontinuous rail sections into an unbroken, smooth steel conduit.
The exothermic thermite chemical process—fundamentally formulated around the reduction of iron oxides by finely granulated aluminum powder ($Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe + \text{Heat}$)—generates liquid superheated steel in excess of 2,400°C within seconds. When tapped into an engineered sand mould cavity encasing the preheated rail ends, it completely fuses the parent rails into a single continuous metallurgical matrix. This eliminates joint gap impacts, dramatically reduces acoustic noise in urban metro networks, and provides superior electrical conductivity for track signalling systems.
Commercial Drivers and Modern Market Trends: With global investments expanding rapidly across urban transit, intercity high-speed passenger corridors, and mega-port logistics hubs, the commercial demand for aluminothermic consumables and precision track maintenance machinery is witnessing sustained growth. Key market trends include:
Unlike stationary or mobile flash-butt welding systems that necessitate massive multi-ton machinery, specialized power trucks, and unrestricted track clearance, aluminothermic welding kits can be manually deployed into high-density turnouts, mountain tunnels, elevated viaduct bridges, and restricted metro tunnels with zero external electrical infrastructure requirements.
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.
State-of-the-art production lines operating under stringent ISO9001 quality management protocols, delivering high-purity thermite powder, precision sand molds, and high-heat refractory linings.
RMTS continuously advances the frontiers of railroad welding metallurgy through independent laboratory research, academic partnerships, and hands-on railway construction experience.
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, including standard carbon, head-hardened, and specialized crane rail alloys.
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.
Furthermore, RMTS maintains partnerships with research institutions, universities, and industry experts in China. These collaborations enable RMTS strengthens its R&D capabilities in thermit welding technologies and next-generation rail bonding processes.
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.
State-of-the-art single-use crucible system manufactured from high-purity refractory materials. Pre-fitted with self-starting automatic tapping plugs, eliminating the need for manual tapping rods and ensuring pure, slag-free molten steel pours into the weld chamber with maximum operator safety.
Engineered multi-use crucible system incorporating advanced magnesia-spinel linings and industrial-grade steel housings. Designed to endure dozens of consecutive high-temperature exothermic reactions, drastically lowering consumable cost per weld on extensive new mainline construction projects.
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.
Thermit portion, sand mold, luting sand, ignitor are the main consumables for aluminothermic welding. 1 weld, 1 set consumables.
For example: 10km track construction project using 12.5m standard rail sections.
Calculation formula: 10,000m / 12.5m × 2 (rails) = 1,600 weld sets
For Continuous Welded Rail (CWR) installations with longer continuous welded strings (e.g., 200m or 500m strings deployed by track laying trains), aluminothermic welding is utilized for all in-situ closure welds (neutralization welds), turnout frogs, insulated rail joints (IRJ), and buffer zone connections.
| Consumable Item | Standard Unit | Core Functionality |
|---|---|---|
| Thermite Portion | 1 Bag / Weld | Calibrated chemical mix providing molten filler steel & slag |
| Preformed Sand Mold | 1 Pair / Weld | High-refractory 3-piece sand cavity matching rail profile (UIC60, 50kg, etc.) |
| Luting Sand / Paste | 1 Pack / Weld | Hermetic mold-to-rail seal preventing liquid steel leakage |
| High-Temp Ignitor | 1 Pc / Weld | Ignition spark initiator reaching >1000°C reaction threshold |
Adhering strictly to international rail standards (EN 14730-1, AREMA, TB/T 1632) is paramount to guaranteeing joint fatigue strength, metallurgical purity, and ultrasonic sound velocity compliance.
Ensure the rail ends to be welded are clean, free from rust, oil, and properly aligned with 1-meter straightedges. The gap size (space between two rails to be welded) shall be 26 ± 2mm. A slight upward crown (1.5–2.0mm) is dialed in to compensate for thermal contraction during molten steel cooling.
Precision sand moulds matching the specific rail profile are clamped firmly around the rail joint using dedicated mould clamps. Luting sand is meticulously packed around all contact flanges to ensure a leak-proof seal against liquid molten steel escaping at 2,400°C.
Using a calibrated propane-oxygen or oxy-acetylene preheating torch positioned centrally over the mould top, the rail ends are preheated uniformly until reaching cherry-red heat (approx. 950°C–1050°C), burning off moisture and ensuring thorough parent-metal fusion.
The portion powder is loaded into the crucible and ignited via a high-temperature ignitor. Within 20–30 seconds, superheated molten steel separates from alumina slag ($Al_2O_3$). The crucible self-taps automatically, flooding the mould cavity to fuse the rail ends flawlessly.
After a prescribed solidification waiting window (typically 4–5 minutes), the mould clamps are removed, and a hydraulic rail shearing machine slices away excess head metal while the joint is in a red-hot plastic state, preserving the initial rail crown geometry.
Once cooled below 300°C, an electric profile rail grinding machine restores the running surface and gauge corner to within ±0.2mm tolerance. The finished joint undergoes Non-Destructive Ultrasonic Testing (UT) to verify absolute internal integrity without porosity or slag inclusion.
RMTS is a passionate and progressive aluminothermic welding Manufacturing company dedicated to field safety, operational reliability, and client technical empowerment.
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 aluminum components and heavy steel rails, invented in the late 1890s and continuously refined for modern high-speed infrastructure.
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. High moisture content in sand moulds or portion powders causes hydrogen embrittlement and catastrophic porosity defects.
Thermit welding, also known as aluminothermic welding, requires careful handling and storage of its materials to ensure safety and optimal performance. Portions, ignitors, and crucibles must be stored off concrete floors in climate-controlled, dry environments under 50% relative humidity.
Explore our complete catalog of certified aluminothermic consumables and high-performance rail maintenance machinery engineered for heavy-duty railway installation projects.
In addition to core consumables, RMTS provides an integrated fleet of specialized track construction machinery to support cutting, drilling, bolt tightening, hydraulic tensioning, and switch grinding.
