Restoration of Unacceptable Holes by Welding


Except where restoration by welding is necessary for structural or other reasons, punched or
drilled mislocated holes may be left open or filled with bolts. When the base metal with
mislocated holes is restored by welding, the following requirements apply:

(1) Base metal not subjected to cyclic tensile stress may be restored by welding, provided
the contractor prepares and follows a repair WPS. The repair weld soundness shall be
verified by the appropriate nondestructive tests, when such tests are specified in the
Contract documents for groove welds subject to compression or tension stress.

(2) Base metal subject to cyclic tensile stress may be restored by welding provided:

(a)  The Engineer approves repair by welding and the repair WPS.

      (b) The repair WPS is followed in the work and the soundness of the restored base
             is verified by the NDT method(s) specified in the contract documents for
             examination of tension groove welds or as approved by the Engineer.

(3) In addition to the requirements of (1) and (2), when holes in quench and tempered
base metals are restored by welding:

      (a) Appropriate filler metal, heat input, and post weld heat treatment (when PWHT)
           is required shall be used.

(b)  Sample welds shall be made using the repair WPS.

      (c) Radiographic testing of the sample welds shall verify that weld soundness
           Conforms to the requirements of

      (d) One reduced section tension test (weld metal); two side bend tests (weld metal);
            and three Charpy V-notch (CVN) impact tests of the heat-affected zone (coarse
            grained area) removed from the sample welds shall be used to demonstrate that
            the mechanical properties of the repaired area conform to the specified
            requirements of the base metal. See Annex III for Charpy testing requirements.

(4) Weld surfaces shall be finished as specified in (5.26.5)