Surface Lamination.

 

Laminar discontinuity in the base metal apparent on the surface of the base metal.

 

1.      For any discontinuity one inch (25mm) in length or less, no plate repair is required, and need not be investigated.

 

2.      For any discontinuity over one inch (25mm) and 1/8”(3mm) maximum depth, no plate repair is required, but the depth should be investigated.

 

3.      For any discontinuity over one inch (25mm) in length with depth over 1/8”(3mm) but not greater than ¼”(6mm), removal is required, but welding is not necessary.

 

4.      For any discontinuity over one inch (25mm) in length with depth over ¼”(6mm), but not greater than 1 inch (25mm), completely remove and weld area required.  Aggregate length of the welding shall not exceed 20% of the length of the plate edge being repaired.  ASTM A6 section 10.5 stipulates requirements for repair by welding.