S9074-AQ-GIB-010/248 Rev 1
CVN SPECIMEN
HAZ
30°
1/16" MIN
WELD FUSION LINE ROOT OF NOTCH
3/8"
A
30°
WELD FUSION LINE CVN SPECIMEN
HAZ
FUSION LINE
WELD DEPOSIT
HAZ
C
ROOT OF NOTCH (SEE NOTE 3)
B
NOTES: 1. If the qualification test material is in the form of a plate or a forging, the axis of the weld shall be oriented in the direction parallel to the principal direction of rolling or forging. Unless inclined specimens are used as required below, a straight wall joint design similar to that shown in sketch A shall be used for obtaining HAZ CVN specimens. Where material thickness permits, the axis of each HAZ CVN specimen shall be inclined to allow the root of the notch to align parallel to the fusion line as shown in sketch B. The notch shall be entirely within the base metal HAZ. Material at least 1-1/2 inches thick is required for a single side, 30-degree bevel weld joint. 2. The CVN specimens shall be removed from a location as near as practicable to a depth midway between the surface and center thickness with the closest surface of the specimen being at least 1/16 inch from the surface of the base material (see sketch A). The coupons for HAZ CVN specimens shall be taken transverse to the axis of the weld and polished and etched to define the HAZ and fusion line prior to machining the notch. The notch of the CVN specimen shall then be cut approximately normal to the material surface, except for sketch B specimens, where the notch axis shall be approximately parallel to the fusion line. 3. Locate root of notch 0.5 to 1.5 millimeters from fusion line in the HAZ in a manner to include as much HAZ as possible in the fracture path. 4. For the comparison of HAZ values with base material values, CVN specimens shall be removed from the unaffected base material at approximately the same distance from the base material surface as the HAZ specimens. The axis of the unaffected base material specimens and their notch axes shall be parallel to the axes of the HAZ specimens. 5. Testing and acceptance criteria shall be in accordance with 4.5. 6. Before testing, take color photomacrographs of at least one side view of all HAZ CVN specimens clearly showing the root of the notch and its location relative to the fusion line, and the entire etched HAZ/fusion line below the notch (see sketch C). Before testing, measure the distance of the root of the notch from the fusion line and record this distance using the location reference above, along with the energy required to break the specimen. Submit these along with other qualification test data for approval.
Figure 7-24. Heat Affected Zone (HAZ) and Base Material Charpy V-Notch (CVN) Specimens
7-100
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