15° to 80° 80° to 90°

80° to 280° 0° to 360°


1. The horizontal reference plane is always taken to lie below the weld under consideration.

2. The inclination of axis is measured from the horizontal reference plane toward the vertical reference plane.

3. The angle of rotation of the face is determined by a line perpendicular to the theoretical face of the weld which passes through the axis of the weld. The reference position (0°) of rotation of the face invariably points in the direction opposite to that in which the axis angle increases. When looking at point P, the angle of rotation of the face of the weld is measured in a clockwise direction from the reference position (0°).

Figure 5.1—Positions of Groove Welds

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