Metal composite materials refer to composite materials formed by metallurgical combination at the interface using composite technology or a variety of metals with different chemical and mechanical properties, which greatly improve the thermal expansion, strength, fracture toughness, impact toughness, wear resistance, electrical properties, magnetic properties and many other properties of a single metal material, so it is widely used in shipbuilding, metallurgy, mining, machinery manufacturing, aerospace parts manufacturing and other industrial fields.
The most common materials in the industry are metal composite materials, aluminum, magnesium, copper, titanium and their alloys. Its molding methods are divided into two kinds of solid phase molding and liquid phase molding, the first one is at a temperature lower than the melting point of the body, and pressure molding is applied to it, including diffusion welding, powder metallurgy, hot and cold rolling, ** welding, etc. The second type melts the body and fills it into the reinforcement material, including casting, squeeze casting, etc.
The red location in the figure below is prone to internal porosity defects during production
In the process of reproduction of composite materials, there are inevitable defects. Cracks, interlayer separation problems, can propagate and lead to failure of composite properties. As we all know, the application of composite materials in the aerospace manufacturing industry is very extensive, welding technology is one of the commonly used processing technologies, welding is one of them, whether a workpiece is qualified or not, may affect the subsequent development of the stability of the entire system. Today, let's talk about how we use water immersion ultrasound to detect **welded metal composites?
Copper stainless steel ** composite material quality inspection report
Caisheng Technology accepted the user's entrustment and tested the incoming samples.
The test report is as follows
System:The testing system uses the ultrasonic automatic detection and evaluation system UST-33 produced by Beijing Caisheng Technology for testing.
The parameters are shown in the table below
Brief introduction to the principle:
Using the ultrasonic characteristics, combined with the motion control system for automatic scanning, and recording the corresponding ultrasonic changes at each position, the software processing, can draw the changes of the ultrasonic echo of the fitting surface. And automatically calculate the binding rate.
The results of the scan are as follows
Note: The incidence on the stainless steel side means that the stainless steel side faces the side of the probe, and the ultrasonic wave is incident from the stainless steel material to reach the posterior reflection of the bonding surface.
Summary of technical advantages:
Clear imaging with custom point aggregation probes for high-precision imaging.
Defects are automatically evaluated and counted, and defective positions of workpieces can be quickly detected.
It is used for welding defect detection of metal composite materials in a variety of fields, reducing costs and deployment time.
The system is stable, safe and reliable, and easy to maintain.
Water-immersed ultrasound C-scan detection
With China's process demand for composite materials, the further improvement and attention to the detection technology of metal composite welding quality, water immersion ultrasonic C scanning imaging equipment has been the "weapon" for the detection of welding quality defects in most large domestic manufacturing plants.