Ultrasonic EMAT Guided Wave Method for Disbond Detection in Multi-Layer Clad Metal Strip

摘要

Clad metals are composite metal containing two or more layers that have been bonded together by rolling, extrusion, welding, diffusion bonding, casting, heavy chemical deposition, or heavy electroplating. Clad metals combine desirable properties and/or characteristics of individual metals and alloys into a material "system" that provides improved characteristics over individual metals. In the event the bond quality is compromised, these materials will not meet their original purpose. Disbonds in clad layers are very similar to an internal void in single-layer materials such as steel strip material. One of the most significant developments of the last 20 years is the advent of noncontact solutions that do not require coupling, such as Electro Magnetic Acoustic Transducers (EMAT), used for ultrasonic testing of metals.