S9074-AQ-GIB-010/248 Rev 1
g. For S-1 through S-6A, S-8, S-10H, S-11, S-51, S-52, S-53, and S-53A base materials, a change from one of the following types of PWHT to any other type of PWHT shall also apply:
PWHT of S-10H materials by other than a full solution anneal is prohibited unless approved by NAVSEA. (1) PWHT below the lower transformation temperature. (2) PWHT above the upper transformation temperature (e.g., normalizing, annealing). (3) PWHT above the upper transformation temperature followed by heat treatment below the lower transformation temperature (e.g., normalizing or quenching followed by tempering; or annealing or solution annealing followed by aging).
(4) PWHT between the upper and lower transformation temperatures. (5) For S-8, a change from a solution anneal to a stress relief and vice versa.
h. For hardfacing, an increase greater than 25 percent in total time at post weld heat treating temperature. For cladding for corrosion resistance with A-8 filler materials, when total time at post weld heat treatment in production exceeds 20 hours, the qualification weld post weld heat treatment holding time shall be at least 80 percent of the total holding time allowed for production. 4-7.9 ADDITIONAL PROCEDURE CHANGES REQUIRING LEVEL I REQUALIFICATION FOR CLADDING AND HARDFACING. In addition to other applicable changes of 4-7 (e.g., 4-7.1, 4-7.2.m, and 4-7.3), the following changes also require level I requalification of procedures for cladding or hardfacing. 4-7.9.1 Changes for All Processes. For all welding processes: a. An increase in the maximum interpass temperature over that used for qualification. b. An increase of 25 percent or more in total time at PWHT temperature. c. A reduction in the number of cladding/hardfacing layers used for qualification (see figure 7-4, note 1, or figure 7-6, note 3 as applicable). Also, a reduction in the number of butter layers used for qualification, or the addition of a butter layer. d. A decrease in weld thickness of cladding or hardfacing beyond that permitted by table 7-6, including figure 7-4, note 2, or figure 7-6, note 3, respectively; also see 4-8.z for weld thickness increases. e. A decrease in base material thickness beyond that permitted by table 7-6 and figure 7-4, note 2.a for cladding or, for hardfacing, a change in base material thickness beyond that permitted by table 7-6 and figure 7-6, note 2. f. For manual welding, a change from a stringer bead type of deposition to weaving in excess of three times the core diameter of the electrode, and vice versa. For semiautomatic welding, a change greater than 30 percent in bead width from that used for qualification. g. An increase in heat input greater than 10 percent (or, for shielded metal arc welding only, a decrease in bead length deposited per unit length of weld greater than 10 percent) over that used for qualification (see 4- 4.1.13).
Fabrication document heat input requirements shall not be exceeded in any case.
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