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Explore our primary equipment designed for high-efficiency thermit welding and installation processes.
In the modern era of rail infrastructure, the demand for seamless, Continuous Welded Rail (CWR) tracks has grown exponentially. Mechanical joints, which were once the industry standard, are increasingly phased out due to high maintenance costs, noise pollution, and susceptibility to wear under heavy dynamic loads. Thermit rail welding, also known as aluminothermic welding, remains the premier choice for on-site rail joining during track installation and maintenance.
As railway operators push for higher speeds and heavier axle loads, the structural integrity of welded joints has become a critical safety factor. Thermit welding provides a continuous metallurgical bond that matches the profile and strength of the parent rail, eliminating the weak points associated with traditional fishplates and bolts. From high-speed passenger lines in Europe and Asia to heavy-haul mineral transport corridors in Australia and North America, thermit welding is the backbone of modern rail network expansion.
The market is witnessing a shift towards automated and semi-automated welding systems, pre-fabricated single-use consumables, and advanced metallurgical formulas. Manufacturers are continuously innovating to reduce installation times, minimize human error, and enhance the longevity of the welded joint under extreme environmental conditions.
How aluminothermic reactions deliver high-strength joints for high-speed and heavy-haul rail networks.
At the heart of thermit welding is a highly exothermic reduction reaction: iron oxide reacts with aluminum powder to produce molten steel and aluminum oxide slag. Operating at temperatures exceeding 2500°C, the superheated steel flows into the weld gap, completely fusing the rail ends.
Traditional multi-use crucibles require extensive cleaning and prep work. Modern One-Shot Crucible Technology simplifies the process by providing a pre-measured, single-use vessel that reduces manual handling, prevents contamination, and ensures consistent pour rates.
For high-volume rail installation projects, Long Life Crucible Technology offers a durable multi-heat option. Designed with high-grade refractory linings, these crucibles withstand multiple consecutive reaction cycles, optimizing project costs and material efficiency.
A global leader in railroad thermit welding materials and engineering solutions.
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.
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.
We actively participate 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 infrastructure integrity.
RMTS maintains partnerships with research institutions, universities, and industry experts in China to continually strengthen our technological capabilities.
Aluminothermic welding plays a crucial role across various critical transit and industrial sectors.
Thermit portion, sand mold, luting sand, and ignitor are the main consumables for aluminothermic welding. 1 weld = 1 set of consumables.
For example, for a 10km project using 12.5m long rails:
Calculation formula: 10000m / 12.5m × 2 rails = 1600 sets.
Standard operating procedures for ensuring high-strength, defect-free welded joints.
Ensure the rail ends to be welded are completely clean, free from rust, scaling, oil, and moisture. Proper alignment is critical to prevent geometric defects. The gap size (the space between the two rails to be welded) must be set precisely at 26±2mm. Use specialized rail pulling and joint adjustment machinery to hold the rails securely in place.
Fit the pre-formed sand moulds onto the rail joint. Secure them using precision mould clamps to prevent shifting during the pour. Apply high-performance luting sand around the joints and seams of the mould to create an airtight seal, preventing any molten steel from leaking out during the pour.
Preheat the rail ends using a specialized burner. Preheating is essential to bring the rail ends close to their melting temperature, ensuring complete metallurgical fusion when the molten steel is introduced.
Place the crucible containing the thermit portion onto the crucible stand over the mould. Ignite the portion using a high-temperature ignitor. Once the reaction is complete (typically within 10-15 seconds), the self-tapping mechanism opens, allowing the superheated steel to flow smoothly into the mould, followed by the slag.
Allow the weld to cool for a specified duration. Once the steel has solidified but is still hot, use a rail shearing machine to remove the excess weld metal from the rail head. After cooling completely, utilize profile rail grinding machines to restore the running surface of the rail to its exact original profile.
Thermit welding materials will fail if exposed to water. All welding portions, sand moulds, and luting sand must be stored in a dry, moisture-proof environment. Moisture in the portion can cause explosive steam reactions during ignition, compromising safety and weld quality.
Over 20 years of experience in providing complete end-to-end support for global rail networks.
Aluminum thermit welding is a specialized technique utilizing a chemical reaction to generate intense heat for joining components, developed to meet heavy industrial demands.
We provide step-by-step documentation, video tutorials, and on-site support to ensure that rail installation crews achieve defect-free welds.
We offer a wide range of thermit welding materials, such as welding kits, sand moulds, one-shot/long-life crucibles, luting sand, and ignitors tailored to local rail profiles.
Explore our complete range of consumables, tools, and machinery for high-precision rail installation.
