API STD 1104:2005 pdf download

API STD 1104:2005 pdf download.Welding of Pipelines and Related Facilities.
Nick-break specimens prepared in this manner from welds made with certain mechanized and semiautomatic processes may fail through the pipe instead of the weld. When previous testing experience indicates that failures through the pipe can he expected, the external reinforcement may he notched to a depth of not more than 1/16 in. (1.6 mm), measured from the original weld surface.
At the company’s option, Nick-break specimens for qualification of a procedure using a semiautomatic or mechanized welding process may be macro-etched prior to being nicked.
5.6.3.2 Method
The Nick-break specimens shall be broken by pulling in a tensile machine, by supporting the ends and striking the center, or by supporting one end and striking the other end with a hammer. The exposed area of the fracture shall be at least 3/4 in. (19 mm) wide.
5.6.3.3 Requirements
The exposed surfaces of each Nick-break specimen shall show complete penetration and fusion. The greatest dimension of any gas pocket shall not exceed 1/16 in. (1.6 mm), and the combined area of all gas pockets shall not exceed 2% of the exposed surface area. Slag inclusions shall not he more than /32 in. (0.8 mm) in depth and shall not he more than 1/8 in. (3 mm) or one—half the nominal wall thickness in length, whichever is smaller. There shall he at least 1/2 in. (13 mm) separation between adjacent slag inclusions. The dimensions should be measured as shown in Figure 8. Fisheyes. as defined in AWS A3.0, are not cause for rejection.
5.6.4 Root- and Face-bend Test
5.6.4.1 Preparation
The root- and face-bend test specimens (see Figure 6) shall be approximately 9 in. (230 mm) long and approximately 1 in. (25 mm) wide, and their long edges shall be rounded. They may be machine cut or oxygen cut. The cover and root-bead reinforcements shall be removed flush with the surfaces of the specimen. These surfaces shall be smooth, and any scratches that exist shall be light and transverse to the weld.
5.6.4.2 Method
The root- and face-bend specimens shall be bent in a guided-bend test jig similar to that shown in Figure 9. Each specimen shall be placed on the die with the weld at mid span. Face-bend specimens shall be placed with the face of the weld toward the gap, and root-bend specimens shall he placed with the root of the weld toward the gap. The plunger shall be forced into the gap until the curvature of the specimen is approximately U-shaped.
5.6.4.3 Requirements
The bend test shall be considered acceptable if no crack or other imperfection exceeding 1/8 in. (3 mm) or one-half the nominal wall thickness, whichever is smaller, in any direction is present in the weld or between the weld and the fusion zone after bending. Cracks that originate on the outer radius of the bend along the edges of the specimen during testing and that are less than 1/4 in. (6 mm), measured in any direction, shall not be considered unless obvious imperfections are observed. Each specimen subjected to the bend test shall meet these requirements.
5.6.5 Side-bend Test
5.6.5.1 Preparation
The side-bend test specimens (see Figure 7) shall he approximately 9 in. (230 mm) long and approximately 1/2 in. (13 mm) wide, and their long edges shall he rounded. They shall be machine cut, or they may be oxygen cut to approximately a 3/4 in. (19 mm) width and then machined or ground to the 1/2 in. (13 mm) width. The sides shall be smooth and parallel. The cover and root-bead reinforcements shall he removed flush with the surfaces of the specimen.
5.6.5.2 Method
The side-bend specimens shall be bent in a guided-bend test jig similar to that shown in Figure 9. Each specimen shall be placed on the die with the weld at mid span and with the face of the weld perpendicular to the gap. The plunger shall be forced into the gap until the curvature of the specimen is approximately U-shaped.
5.6.5.3 Requirements
Each side-bend specimen shall meet the root- and face- bend test requirements specified in 5.6.4.3.
5.7 WELDING OF TEST JOINTS-FILLET WELDS
To weld the test joint for a fillet weld, a fillet weld shall be made to one of the configurations shown in Figure 10, following all the details of the procedure specification.
5.8 TESTING OF WELDED JOINTS-FILLET WELDS
5.8.1 Preparation
To test the fillet-welded joint, test specimens shall he cut from the joint at the locations shown in Figure 10. At least four specimens shall he taken and prepared as shown in Figure 11. The specimens may he machine cut or oxygen cut. They should he at least I in. (25 mm) wide and long enough so that they can be broken in the weld.