Inspection

V-PATHS-USE SINGLE AND MULTIPLE LEGS AND VARIOUS ANGLES, AS REQUIRED, TO COVER THE COMPLETE WELD INCLUDING THE ROOT AREA.

Figure 6.1—Ultrasonic Scanning Techniques

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AWS D3.6M:1999

planar, versus spherical, by noting changes in amplitude as the transducer is swung in an arc centered on the reflector. The location (position) of discontinuities within the weld cross section, as well as from an established reference point along the weld axis, shall be determined. See Figure 6.2 for additional evaluation requirements.

6.14.7 Acceptance Criteria. Refer to 7.12.

6.14.8 Reporting

6.14.8.1 A report clearly defining the environment (depth, etc.) and identifying the part and the area of inspection shall be completed by the ultrasonic technician at the time of inspection. A detailed report including a sketch showing the location along the weld axis, location within the weld cross section, size, extent, orientation, and classification for each discontinuity shall be completed for each weld in which significant indications are found. A recommended form is included in Annex A. Report forms shall be submitted to the Customer upon completion of the work.

6.14.8.2 When specified, discontinuities approaching rejectable size, particularly those about which there is some question in their evaluation, shall also be reported.

6.14.83 Areas of any part for which complete inspection was not practicable shall also be explained in the report.

6.14.8.4 Unless otherwise specified, the reference position and the location and extent of rejectable flaws shall also be marked physically on the workpiece.

PartV

Magnetic Particle Examination 6.15 General

6.15.1 The procedure and standards described herein shall govern magnetic particle examination, when such an examination is required. This method is used for detecting linear discontinuities at or very near the surface of welds in magnetic materials.

6.15.2 Variations in the examination procedure, equipment, and acceptance criteria may be used with approval of the Customer. Such variations may include means used to magnetize the weld or to apply magnetic particles.

Evaluation Requirements:

1. Use combination of beam boundary and amplitude.

3. Determine "class": Linear/Planar versus Spherical.

4. Length (L) and height (H) shall be based upon a rectangle that totally encloses the indicated discontinuity.

5. Aligned discontinuities separated by less than (L, + L2)/2 and parallel discontinuities separated by less than (H, + H2)/2 shall be evaluated as being continuous.

6. Accumulative flaws shall be evaluated over a 150 mm (6 in.) or D/2 length of weld, whichever is less.

7. Root area shall be defined as that lying within 6 mm (1/4 in.) or T/4, whichever is greater, of the root of the theoretical weld.

8. Record the position (location) of discontinuities within the weld cross section as well as from an established reference point along the weld axis.

Evaluation Requirements:

1. Use combination of beam boundary and amplitude.

3. Determine "class": Linear/Planar versus Spherical.

4. Length (L) and height (H) shall be based upon a rectangle that totally encloses the indicated discontinuity.

5. Aligned discontinuities separated by less than (L, + L2)/2 and parallel discontinuities separated by less than (H, + H2)/2 shall be evaluated as being continuous.

6. Accumulative flaws shall be evaluated over a 150 mm (6 in.) or D/2 length of weld, whichever is less.

7. Root area shall be defined as that lying within 6 mm (1/4 in.) or T/4, whichever is greater, of the root of the theoretical weld.

8. Record the position (location) of discontinuities within the weld cross section as well as from an established reference point along the weld axis.

Figure 6.2—Discontinuity Evaluation

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