Quality Inspection Of Bridge Steel Plates

Bridge steel plates are important materials in bridge construction, and their quality and performance have a crucial impact on the safety and service life of bridges. Therefore, the inspection of the quality of bridge steel plates is an essential step.

The quality inspection of bridge steel plates mainly involves the following aspects:

The first is physical performance. Physical performance testing includes the hardness, tensile strength, bending strength, and other aspects of the steel plate. These testing items mainly involve conducting tensile, bending, and other tests on steel plates in the laboratory to obtain relevant physical performance data to evaluate whether the quality of the steel plates meets the standards.

Next is the chemical composition. Chemical composition testing mainly tests whether the element content of steel plates meets standard requirements, such as whether the content of elements such as C, Mn, Si, etc. meets national standards. These tests can be carried out through technical means such as spectral analysis.

At the same time, the surface quality of bridge steel plates also needs to be inspected. Surface quality includes defects, oxide scales, black spots, cracks, inclusions, and other aspects of the rolled surface. These inspections can be carried out through technical means such as visual inspection, magnifying glass observation, and magnetic particle testing.

Finally, for some bridges with special applications, such as underwater bridges and bridges in cold regions, it is also necessary to test the special performance of steel plates at low temperatures and seawater.

In short, the quality inspection of bridge steel plates is a very important link in bridge engineering. Only through strict testing and evaluation can the quality of steel plates meet the standard requirements, thereby ensuring the safe use of bridges.

Braking resistors are widely used in diesel locomotives, DC electric locomotives and subway vehicles. In the vehicle braking process, some vehicles, such as subway vehicles, its main circuit to provide the braking resistor current. Locomotive braking resistor is the original drive wheel on the traction motor into a generator, the use of train inertia by the wheel drive motor rotor rotation and power generation, resulting in reverse torque, the consumption of train kinetic energy, to achieve the purpose of braking effect . The motor current through a specially set resistor, the use of ventilation heat dissipation in the atmosphere.                

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