$($e$)$ When visiting a steel mill, it's important to identify common quality issues in the rolling process. Discuss four defects and ways to mitigate them.

$($i$)$ Show the FOUR $(4)$ defects to be produced from sheet metal production.

$(5$ Marks$)$

$($ii$)$ With the aid of diagrams, illustrate the manufacturing activities to mitigate the occurred defects.