The missing edges of 1~3mm can be repaired to be flat, and the missing edges or grooves of more than 30mm should be repaired with a low hydrogen electrode of Φ3.2 or less, and repaired to a smooth surface.
1 to 3mm of the absence of prism is repaired to flat, more than 30mm of the absence of prism or groove application of 3.2 low hydrogen welding rod rewelding, and grinding to flat.
The 1-3mm missing edge can be grinded to be flat, and the over 30mm missing edge or groove shall be repaired with low hydrogen electrode below Φ 3.2 and grinded to be flat.