S9074-AQ-GIB-010/248 Rev 1
DIRECTION OF WELDING
M A C R O
M A C R O
M A C R O
2" MIN
4" MIN
6" MIN
8" MIN
WELD SURFACE AFTER MACHINING FOR VT, PT, AND HARDNESS TESTING (3)
TOTAL DEPOSIT (1)
HARDFACING
MIN THICKNESS QUALIFIED (6)
T (2)
WELD FUSION LINE
BASE METAL
NOTES: 1. The total hardfacing thickness should be approximately equal to the unmachined thickness to be deposited in production, with adequate allowance to permit machining the entire weld surface while maintaining minimum required thickness (see notes 3 and 6). For cladding of cylindrical materials, also see figure 7-5. 2. Thickness (T) is the nominal base plate thickness. For production base metal thicknesses: (a) 1 inch and greater: T = 1 inch or greater. (b) Less than 1 inch: T = minimum thickness to be welded in production; qualifies up to 1 inch. (Qualified hardfacing weld thickness shall be per note 3). 3. The surface of the hardfacing shall be machined to the minimum thickness to be allowed for production (see note 6) and then visual (VT) and PT inspected per note 4; hardness testing shall then be performed per note 6 and macro-etch examination per note 5. This weld thickness and the number of layers at this thickness are the minimum qualified. Maximum qualified weld thickness shall be twice the machined weld thickness. Where greater qualified weld thicknesses are desired and other essential elements remain the same, a second test assembly shall be prepared and tested in this same fashion except that machined thickness for testing shall be as required. 4. VT and PT shall be per 4-5. VT acceptance criteria shall be per MIL-STD-2035, class I. PT acceptance criteria shall be per MIL-STD-2035 for the following: (a) Valve seating surface contact line; these criteria shall apply unless the welding procedure specifies that it is not applicable to valve seat hardfacing, in which case the criteria of note 4(b) shall apply. (b) Class 1 for the machined weld thickness, unless specific approval is obtained before qualification welding for a
different MIL-STD-2035 hardfacing criteria and the following conditions are met: (i) The production application only involves the less stringent PT acceptance criteria. (ii) The welding procedure identifies, and is limited to, the specific application involved.
5. Macro-etch examination shall be per table 7-7 and 4-5.2.6. Where weld thickness less than 1/8 inch is to be qualified, submit macro-etch specimens (or photo macrographs of these specimens clearly showing the fusion area) along with other procedure qualification test data for approval.
(Notes continued on next page.)
Figure 7-6. Procedure Qualification Test Plate for Hardfacing (Also See Figure 7-5 for Cylindrical Materials)
7-79
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