Rail Transit

The rail transit system, including high-speed rail, subways, conventional railways, trams, etc., is a complex. Its core components such as rails, wheels, axles, bogies, and welded joints are subjected to tremendous alternating loads, wear, impact, and environmental influences (e.g., temperature, rain) during long-term service. This inevitably leads to issues like fatigue cracks, internal defects, wear, and corrosion.

Safety is the paramount lifeline: The failure of any critical component could lead to catastrophic accidents, resulting in significant casualties and property damage. Nondestructive testing (NDT) is a technology that detects, locates, and evaluates internal and surface defects in materials without destroying or affecting the component's performance. It is a core technical means for ensuring operational safety.

The economic benefits are significant: Through regular nondestructive testing, "predictive maintenance" and "condition-based repair" can be achieved. This means potential hazards are identified and addressed before they lead to failures, allowing for planned maintenance and replacement. This avoids operational disruptions caused by sudden failures (requiring maintenance during limited operational windows), greatly enhances operational efficiency, and reduces the overall lifecycle maintenance costs.

Extending equipment service life: Accurately assessing the severity and development trends of defects enables scientific decision-making on whether to continue using, repair, or replace a component. This avoids "over-maintenance" or "insufficient maintenance," thereby maximizing the value derived from components and extending the overall service life of the system.