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Explore our primary high-temperature consumables engineered specifically for aluminothermic railway maintenance. These products ensure maximum joint integrity and long service life under severe track conditions.
In modern railway infrastructure, the demand for Continuous Welded Rail (CWR) has grown exponentially. CWR eliminates traditional mechanical joints, reducing track maintenance costs, extending rail life, and lowering vibration levels. At the core of creating seamless CWR joints in the field is the aluminothermic welding process, which relies heavily on high-purity aluminum welding flux (often commercially referred to as thermit portions or thermite powder).
"The aluminothermic reaction is a highly exothermic chemical reduction process. Pure aluminum powder acts as the reducing agent, reacting with iron oxides to produce superheated molten steel and an aluminum oxide slag at temperatures exceeding 2500°C (4532°F)."
The standard thermite chemical reaction is represented as: Fe₂O₃ + 2Al → Al₂O₃ + 2Fe + Heat. However, for railway maintenance, standard thermite is insufficient. The aluminum welding flux must be metallurgically engineered. It contains precise percentages of carbon, manganese, silicon, and other alloying elements like chromium or vanadium. These additives ensure that the resulting weld metal matches the metallurgical structure, hardness, and wear resistance of the parent rail steel (such as U71Mn or U75V grades).
Without high-quality fluxing agents, the molten steel would suffer from gas porosity, slag inclusions, or excessive grain growth. The flux ensures that impurities float to the surface as slag (alumina), leaving behind clean, dense, and defect-free molten steel that fills the gap between the two rail ends.
The global railway maintenance industry is shifting towards rapid-intervention technologies. With passenger and freight traffic increasing, track maintenance windows (possessions) are shorter than ever. This requires welding flux formulations that react quickly, preheat efficiently, and cool down safely without compromising mechanical properties. Additionally, environmental regulations have driven the market toward low-fume, eco-friendly formulations that minimize emissions during the exothermic reaction.
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.
Our state-of-the-art 5,500+㎡ production facility in Tianjin utilizes advanced mixing, testing, and packaging equipment to guarantee consistency in every batch of aluminum welding flux and thermit consumables.
Innovation is the core driver of railway safety. Our dedicated research and development team ensures that our aluminum welding flux products remain at the cutting edge of global transit technology.
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 varying profiles and steel grades.
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 to strengthen its R&D capabilities in thermit welding technologies.
Our Commitment: 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.
Different rail networks subject tracks to wildly distinct stress profiles. Consequently, aluminum welding flux must be custom-tailored for each application scenario to prevent premature failure, excessive wear, or catastrophic derailments.
High-speed lines (operating at speeds above 250 km/h) demand absolute geometric precision and zero tolerance for surface defects. A tiny dip or hardness mismatch in the weld zone can lead to severe dynamic wheel-rail impact forces. Our aluminum welding flux for HSR is formulated to match the exact hardness profile of the rail head, preventing localized wear (squats) and guaranteeing a smooth ride.
Heavy-haul tracks endure extreme axle loads (often exceeding 30 tons per axle) and massive cumulative tonnage. The primary threat here is plastic deformation and fatigue cracking. The weld metal created by the thermit reaction must possess exceptional yield strength and fracture toughness. Our heavy-haul flux portions are enriched with chromium and vanadium to refine the grain structure and prevent crack propagation.
Crane rails at seaports operate under massive static loads in highly corrosive marine environments. Standard welds quickly succumb to stress-corrosion cracking. RMTS provides specialized welding kits with corrosion-resistant flux elements, ensuring that the weld joint remains structurally sound under the weight of massive container gantry cranes.
Urban transit systems feature tight curves, frequent braking, and close proximity to residential areas. Noise and vibration mitigation are top priorities. Seamless joints welded with premium flux ensure continuous wheel contact, reducing ground-borne noise and extending the lifespan of both track and rolling stock in confined tunnel environments.
We offer two distinct crucible technologies to match your project budget, execution speed, and environmental requirements.
Our single-use, self-tapping crucible system. It eliminates the need for preparation, lining preheating, and cleaning. It minimizes human error, ensuring a perfect pour every time, making it the ideal choice for rapid maintenance windows.
Designed for high-frequency operations, this multi-use crucible features a highly durable refractory lining. It offers a cost-effective solution for large-scale construction projects where multiple welds are performed sequentially in a single shift.
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.
Aluminothermic welding is a package system. To achieve a single, high-strength joint, track crews require a complete set of consumables. For proper project logistics, planning the correct quantity of materials is vital.
Standard Consumables Set: Thermit portion (Aluminum Welding Flux), sand mould, luting sand, and ignitor are the main consumables for aluminothermic welding. 1 weld = 1 set of consumables.
Example Calculation: For a 10km project using standard 12.5m long rails:
Calculation formula: 10000m / 12.5m × 2 (both rails) = 1600 sets of consumables required.
RMTS is a passionate and progressive aluminothermic welding manufacturing company with over 20 years of experience. We provide detailed guidelines to ensure optimal weld quality in the field.
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 and steel components...
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...
Thermit welding materials will fail if exposed to water. All welding materials should be kept away from any moisture in storage, as well as during the welding process...
Thermit welding, also known as aluminothermic welding, requires careful handling and storage of its materials to ensure safety and optimal performance. Store in dry, well-ventilated spaces...
Offer 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...
We manufacture and supply the complete spectrum of track maintenance equipment and consumables required to clean, align, weld, shear, and grind railway joints.
