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ortion. Peening shall not be used on the internal layer (root) of the weld metal nor on the fina layers unless the weld is postweld heat treated. WC-4410 PRECAUTIONS TO BE TAKEN BEFORE WELDING WC-4424 Surfaces of Welds WC-4411 Identification Storage, and Handling of Welding Materials Each Certificat Holder is responsible for control of the welding electrodes and other materials that are used in the fabrication and installation of components (WC-4120). Suitable identification storage, and handling of electrodes, flux and other welding materials shall be maintained. Pre- cautions shall be taken to minimize absorption of moisture by electrodes and flux WC-4412 Cleanliness and Protection of Welding Surfaces
The method used to prepare the base metal shall leave the weld preparation with reasonably smooth surfaces. The surfaces for welding shall be free of scale, rust, oil, grease, and other deleterious material. The work shall be protected from deleterious contamination and from rain, snow, and wind during welding. Welding shall not be performed on wet surfaces.
As-welded surfaces are permitted. However, the surface of welds shall be sufficientl free from coarse ripples, grooves, overlaps, abrupt ridges, and valleys to meet the requirements of (a) through (e) below. (a) The surface condition of the finishe weld shall be suitable for the proper interpretation of radiographic and other required nondestructive examination of the weld. In those cases where ansi pdf there is a question regarding the surface condition on iso pdf the interpretation of a radiographic film the fil shall be compared to the actual weld surface for inter- pretation and determination of acceptability. (b) Reinforcements are permitted in accordance with WC-4426.1. (c) Undercuts shall not exceed 1fi32 in. (0.8 mm) and shall not encroach on the required section thickness. (d) Concavity on the root side of a single welded circum- ferential butt weld is permitted when the resulting thickness of the weld meets the requirements of WC-3000. (e) If the surface of the weld requires grinding to meet the above criteria, care shall be taken to avoid reducing the
