S9074-AQ-GIB-010/248 Rev 1
A-2.1.9 Friction Stir Tool (FS Tool) Life. The maximum accumulated length of weld an FS tool can produce while maintaining weld soundness and performance requirements. A-2.1.10 Friction Stir (FS) Variant. A technique employed that includes, but is not limited to, FSW, FSP, and FS spot welding. A-2.1.11 Heel Plunge Depth. For tilted axis FS, the vertical dimension that the shoulder extends into the base material, measured perpendicularly from the base material surface to the bottom of the lowest point of the shoulder (see figure A-7). A-2.1.12 Interpass Step-Over Distance and Direction. For FSP, the lateral distance the centerline of the FS tool moves between passes from the centerline of the preceding path and the direction the FS tool moves between passes relative to the centerline of the preceding path (i.e., to the advancing or retreating side of the preceding path’s centerline). A-2.1.13 Lateral Friction Stir Tool (FS Tool) Offset. The perpendicular distance measured from the centerline of the butt joint line to the FS tool axis (see figure A-5). A-2.1.14 Multiple Pass (Multipass). Multiple FS passes performed in sequence that partially or entirely overlap a preceding FS pass. A-2.1.15 Plunge Depth. The vertical dimension that the FS tool extends into the base material measured perpendicularly from the base material surface to the bottom of the probe tip (see figures A-7 and A-8). A-2.1.16 Position Control. A control method whereby a programmed axial position profile is regulated and adapted by adjusting one or more process parameters via feedback in a closed loop control schema. A-2.1.17 Probe-to-Anvil Gap. The vertical distance from the bottom surface of the base material to the bottom tip of the probe embedded within the base material (see figures A-7 and A-8). A-2.1.18 Raster Pattern. A pattern defined by a shape (rectangular, circular, linear, etc.) and orientation (spiral in, spiral out, advancing side out, retreating side out, alternating retreating and advancing side out, etc.) that is formed as the FS tool traverses along a continuous programmed path and overlaps the preceding pass at a specified step-over distance between passes. A-2.1.19 Remnant Oxide Trace (See Figure A-4). An oxide layer from the original joint area that is not fully mixed in the weld and can be seen upon viewing a weld cross-section under magnification. Remnant oxide traces are sometimes referred to as joint line remnants, kissing bonds, or Lazy S discontinuities. A-2.1.20 Seam Tracking. The methodology (automatic, manual, or combination), equipment (cameras, gates, sensors, alarms, tooling, etc.) for maintaining the centerline of the FS tool axis at the desired distance from the centerline of the joint or programmed path. A-2.1.21 Side Tilt Angle. Angle of the FS tool from the workpiece in the direction transverse to the direction of travel. A-2.1.22 Single Pass. Welding or processing performed in a single continuous pass along the joint line or programmed path. A-2.1.23 Single Spindle. FS equipment with a single spindle. A-2.1.24 Special Welds. Welds as defined by 3-2.15 with the following additions for FS: a. Base materials not covered in table A-1. b. Dissimilar metals; also, welding of alloy 6061 to alloy 6082. c. FS that involves the addition of filler materials. d. Joint designs other than butt joints. e. FSP of other than single or multiple passes following in a linear programmed path.
A-2
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