S9074-AQ-GIB-010/248 Rev 1
e. One or more processes may be deleted from a production joint qualified by a combination of processes, provided each remaining process has been qualified within the limits specified by 4-4, 4-7, and 4-8 for each of the processes to be used in the production joint. Similarly, more than one process may be used in a single production joint, provided each process has been qualified either separately or in combination with other processes. However, root layers up to a thickness of 3/16 inch shall be deposited with the same process used in the qualification of the root layers. A change in sequence of the processes used does not require requalification. 4-4.2 QUALIFICATION REQUIREMENTS FOR WELD SURFACING. Build-up or buttering is qualified by qualification of a groove-weld procedure with thickness limits per table 7-6. Weld cladding shall be qualified as specified in 4-4.2.1. Hardfacing shall be qualified as specified in 4-4.2.2. Cladding and hardfacing thickness and weld layer limits shall be per figures 7-4 and 7-6, respectively, and also table 7-6; for cylindrical products, OD limits per table 7-6 and figure 7-5 shall also apply. Buttering in the form of an intermediate layer of different material before cladding or hardfacing shall be qualified with the respective surfacing per 4-4.2.1 or 4-4.2.2, employing the minimum number of buttering layers allowed for production. 4-4.2.1 Weld Cladding for Corrosion Resistance. The test assemblies shall duplicate the production cladding with respect to the base material, and filler material type, except that base and filler material groupings of tables 7-1 and 7-2 and the cross-qualification rules of table 7-3 shall apply. Position limitations for qualifications shall be as outlined in 4-2.8. The clad area, thickness, and other details shall be as shown in figure 7-4. Testing shall be as specified in table 7-7 and figure 7-4. 4-4.2.2 Hardfacing for Wear Resistance. The test assemblies shall duplicate the production hardfacing with respect to the base material, and filler material type, except that the base and filler material grouping of tables 7-1 and 7-2 and the cross-qualification rules of table 7-3 shall apply. Position limitations for qualifications shall be as outlined in 4-2.8. The hardfaced area, thickness, and other details shall be as shown in figure 7-6. Testing shall be as specified in table 7-7 and figure 7-6. 4-4.3 RESISTANCE WELDING. Procedure qualification for resistance welding shall be in accordance with the requirements of AWS D17.2/D17.2M. Procedures and qualification test data shall be submitted per 4-2.3. 4-4.4 STUD WELDING. The stud welding procedure qualification record and qualification limits shall be as follows:
Requalification of Welding Procedure is Required for the Following Changes Corresponding to Essential Elements Listed to the Left:
The Stud Welding Procedure Qualification Record Shall Include the Following Essential Elements:
a. Intended application, activity name, date.
N/A
b. Equipment used, including manufacturer and manufacturer’s model numb er of the power source and stud gun. c. Stud material (specification and alloy) and size. Also, flux type or load (e.g., ball load, ring load, fluxless stud).
See 4-7.4.t.
For material change, see 4-7.2.a; for grouping of stud material, see table 7-3, footnotes 22 and 24.
For stud size, see 4-7.2.l.
For flux type or load, see 4-7.4.u.
For stud shape other than solid cylindrical, see 4-7.2.g.
d. Base material and thickness (specification and alloy). For material change, see 4-7.1.a.
For thickness, see table 7-6.
4-11
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