The reason of the Weld Joint Cracking on high frequency welding pipe was investigated by using macroscopic observation, metallographictechnology, fracture analysis and EBSD technology.
After that the computer image processing technology is used to carry on binary processing for metallographic image, tracking arithmetic makes accurate calculation of individual grain area very easy.
Metallography detection is a technology that studies about the relationship between the structure and the performance of metal material based on the metallographic theory.