Machinery's Handbook, 31st Edition
Nondestructive Testing 1631 The arrow connects the reference line to the part to be tested. The side of the part that the arrow points to is considered the arrow side . The side opposite the arrow side is con- sidered the other side . Location of Testing Symbol: Tests to be made on the arrow side of the part are indi- cated by positioning the testing symbol on the side of the reference line toward the reader (Fig. 5a). Tests to be made on the other side of the part are indicated by the testing symbol being on the side of the reference line away from the reader (Fig. 5b).
Fig. 5a. Position of Testing Symbols Indicates Tests to Be Made on
Fig. 5b. Position of Testing Symbols Indicates Tests to Be Made on
the Arrow Side the Other Side To specify where only a certain length of a section is to be considered, the actual length or percentage of length to be tested is shown to the right of the test symbol. To specify the number of tests to be taken on a joint or part, the number of tests is shown in parentheses. Tests to be made on both sides of the part are indicated by test symbols on both sides of the reference line. Where nondestructive symbols have no arrow or other significance, the testing symbols are centered in the reference line. Direction of Radiation: When specified, the direction of radiation may be shown, in con - junction with the radiographic or neutron radiographic basic testing symbols, by means of a radiation symbol located on the drawing at the desired angle.
Fig. 6. Indicating Direction of Radiation Tests Made All Around the Joint: To specify tests to be made all around a joint a circular test-all-around symbol is used.
Fig. 7. Specifying Circular Testing Areas of Revolution: For NDT of areas of revolution, the area is indicated by the test-all- around symbol and appropriate dimensions. Plane Areas: The area to be examined is enclosed by straight broken lines having a small circle around the angle apex at each change in direction. Combination of Symbols: Various nondestructive basic testing symbols may be com- bined. Also, NDT and welding symbols may be combined.
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