Flaw detection is an essential process during titanium processing. As long as the finished product leaves the factory, it will be inspected for flaw. In order to prevent internal defects in titanium materials, there are different requirements for flaw detection levels according to customer requirements and product standards:
一、The most commonly used one at present is: ultrasonic flaw detection.
Ultrasonic flaw detection is a detection method based on sound waves, which can detect internal defects of welded parts, such as pores, cracks, inclusions and pores. The principle of ultrasonic flaw detection is to use the propagation speed and reflection mode of ultrasonic waves in different materials to detect defects. By measuring the relative change signal and amplitude, ultrasonic flaw detection can be used to measure the size defects or attenuation of materials or welds.
Colored flaw detection is a vision-based inspection method, suitable for detecting defects such as cracks, inclusions, and burrs on the surface.
Spray the penetrant evenly on the welding surface, let it penetrate for 10-15 minutes, and then clean off the penetrant. Then use developer, apply the developer thinly and evenly and wait for 7 to 10 minutes. The white light illumination should be greater than 1000Lx to identify defects through naked eye or microscope observation.
二、 Comparison of the advantages and disadvantages of color flaw detection and ultrasonic flaw detection
1. Disadvantages of coloring flaw detection
The dyeing flaw detection operation is more troublesome, and it can only detect surface defects, but cannot find deep defects.
2. Advantages and disadvantages of ultrasonic flaw detection
Ultrasonic flaw detection can detect internal defects of welded parts with higher accuracy, depth and reliability. However, ultrasonic flaw detection requires professional technicians and expensive equipment, and the cost is high.
三、 Summary
In the production process of titanium materials, coloring flaw detection and ultrasonic flaw detection are common non-destructive testing methods. Colored flaw detection mainly detects defects such as surface cracks and burrs, while ultrasonic flaw detection can detect welding defects.
Connecting internal high-precision defects with higher precision, depth and reliability. In practical applications, appropriate testing methods can be selected according to the situation to ensure that the product meets customer requirements.
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