7.2 Undercuts
The depth of an undercut shall not exceed 20% of the thickness of a thinner sheet or plate and 1.0mm when the thinner sheet or plate is 5mm thick or over. The total length of an undercut shall not exceed 20% of the total weld length. The depth of an undercut in important portions shall not exceed 10% of the thickness of a thinner sheet or plate and its total length shall not exceed 10% of the total weld length.