For the body of high-speed rail vehicles, aluminum alloy steel plate is the most widely used. The main components such as the roof, side walls, side beams, beams and skeletons are made of large-area aluminum alloy extruded profiles after processing, and the corresponding mechanical structure is formed between the profiles and the profiles through longitudinal welds. It can be seen that there are a large number of welds in the manufacturing process of the aluminum alloy steel car body, and in the process of vehicle operation, it is affected by its own tension and external environment such as rain, hail, sand and dust, and it is very easy to damage the body structure.
Therefore, in order to ensure the safe operation of high-speed rail trains, it is necessary to regularly carry out the detection and early warning of high-speed rail vehicles and track defects.
Although the visual inspection method is simple, fast and economical, there are obvious shortcomings, that is, the inspector needs to have good vision and can only detect the surface of the part.
However, the defects at the weld joints of the aluminum alloy of the car body are easy to be covered up after the processes of primer, middle coat, putty, topcoat, etc., and most of the internal delamination defects are extremely difficult to be found directly through visual inspection, so it is necessary to use electromagnetic ultrasonic eddy current testing method to detect the internal delamination defects.
Delang DEU200 thin-walled metal component electromagnetic ultrasonic thickness gauge can be used to measure the thickness of steel and steel alloy (including stainless steel) and aluminum alloy tubes, plates and rods. No surface grinding is required for measurement, no couplant is required, and the interval between the sensor and the test object can be up to 25mm, the penetrating coating can directly measure the thickness through paint, varnish, anti-corrosion layer, enamel, plastic, etc.