1. Test fillet weld size s = 3/8 in. except for single-pass fillet welds.

2. Other plate thicknesses and fillet weld sizes may be used by agreement.

3. The number of specimens (straps) cut from the coupon, and their width, W, may be controlled by testing machine capacity. The minimum total length of underwater weld to be tested is 8 in., i.e., 4 in. on top and 4 in. on bottom of the coupon as indicated.

4. Specimens shall be machine cut, with edges smooth and parallel.

5. Prior to testing, the average throat and total test length of each fillet weld test specimen shall be measured. The throat of the weld is the minimum distance from the root of the joint to the face of the fillet weld. Root penetration is disregarded. The weld area in shear is calculated by multiplying the average throat by the total test length.

6. Each specimen shall be tested in tension to failure, which shall be by shear through the test fillet welds. The maximum load is recorded.

7. The shear strength for each specimen is determined by dividing the maximum load by the total weld area (throat times length) in shear. The reported shear strength is the average of the shear strengths of all specimens from the transverse fillet weld test coupon.

8. This specimen may also be used for procedure qualification of fillet welds on pipe.

Figure 5.17A—Fillet Weld Shear Strength Specimens—Transverse from Plate

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