What is the term fish eye mean in welding steel?

In welding, the term "fish eye" refers to a specific type of weld defect characterized by small, round cavities or pores that resemble the shape of a fish eye. These defects typically occur due to contamination, such as moisture or oil, in the welding area or improper gas shielding. Fish eyes can compromise the integrity of the weld, leading to weaknesses and potential failure in the welded joint. Proper cleaning and control of the welding environment can help prevent this issue.