Nondestructive material testing with ultrasonic equipment is more than 40 years old. From the very first examinations, using ultrasonic oscillations for detection of flaws in different materials, it has ...
Welding, which is one of the newer metalworking trades, can trace its historic development back to ancient times ...
In order to evaluate the wear characteristics it is advantageous to use a nondestructive method for measuring the thickness of the hardened surface layer, that is hardness depth ...