S9074-AQ-GIB-010/248 Rev 1
(3) For cladding and hardfacing, a decrease greater than 100 °F from the preheat temperature used for qualification. q. For S-51, S-52, S-53, and S-53A materials, a change in the material used (other than austenitic stainless steels, copper alloys, or aluminum alloys) for the trailing shield. r. For waveform controlled welding (i.e., pulsed gas metal arc welding), a change from one program to a different program on the same power supply, or a change in the manufacturer's power supply model number, or from one manufacturer’s power supply to a different manufacturer's power supply. s. For robotic, automatic, or mechanized pipe groove and fillet welding of diameters less than 5 inches OD, an increase or decrease in pipe diameter from that qualified (see 4-4.1.10.1 and table 7-6, footnote 13). t. For robotic, automatic, and mechanized welding of pipe that is 5 inches OD or greater with a thickness of 3/8 inch or greater, an increase in pipe thickness exceeding 1.1T but not more than 2T; for greater thickness increases, see 4-7.1.b for level I qualification. u. For robotic, automatic, or mechanized welding, the following changes shall also apply: (1) An addition, deletion, or change of adaptive fill welding control algorithm that determines the bead planning or placement. (2) An addition, deletion, or change in weld joint tracking method (e.g., through-arc, laser, camera), including changes in make or model. (3) Except for manual methods, a change in joint locating method (e.g., wire touch, laser, camera), including changes in make or model. A change from manual joint location to any other method of joint location. (4) Where sensing is employed, a change in joint measurement method (e.g., wire touch, laser, camera). v. In robotic welding, a change in model of the robot controller or a change in manufacturer of the robot. w. In robotic welding, a change from a later (i.e., more current) version to an earlier version of robotic controller software. x. For robotic welding, the addition of cross-qualified positions (see 4-4.1.10.3.a). y. In robotic or automatic welding using through-arc tracking, a change in length of ±25 feet of the welding ground cable or voltage measurement cable used for feedback control. Qualification at a minimum and a maximum cable length shall qualify cable lengths in between. z. For cladding and hardfacing, an increase in weld thickness beyond that allowed by table 7-6; however, qualification testing shall not require composition or dilution testing. aa. A change from semi-automatic to mechanized, automatic, or robotic welding (see 4-7.4.d for vice versa); however, level I qualification shall be required if the mechanized, automatic, or robotic oscillation amplitude (see 3-2.11.a) exceeds 1/2 inch for materials where toughness testing is required by table 7-7, footnote 2. bb. A change from robotic to mechanized or automatic welding and vice versa. cc. An increase in shielding gas flow rate greater than 50 percent.
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