Info

Document provided by IHS Licensee=ConocoPhillips WAN/5919206100, User=, 11/19/2003 23:12:38 MST Questions or comments about this message: please call

AWS D3.6M:1999

three macroetch test specimens may be removed from the weld adjacent to the required bend specimens; such specimens shall be prepared and etched in accordance with 5.11, and meet the requirements of 8.6.

8.6.2 Test Results. Welder qualification test results for Class B groove welds shall meet the following requirements:

8.6.2.1 Visual Examination. The weld shall meet the visual acceptance criteria of 8.9.

8.6.22 Radiographic (or Macroetch Test Specimens) Examination. The weld shall meet the acceptance criteria of 8.10.

8.6.2.3 Bend Tests. The bending fixture shall conform to Figure 5.12 of section 5, Part B. Maximum bend radius for testing shall be 6T. Four samples shall be tested, and none shall reveal tears or other defects exceeding 3 mm (1/8 in.) in the weld metal or fusion zone after the bending. Tears which originate at the corner of the specimen and are less than 6 mm (1/4 in.) long shall not be cause for rejection unless they are associated with a defect.

8.7 Fillet Welds

8.7.1 Test Specimens. The welder shall weld fillet-weld-break and macroetch test assemblies as shown in Figure

5.8 in accordance with the requirements of variables and positions of 5.16 and Table 5.5. The number and type of specimens required to qualify from each assembly are shown in Table 8.3.

8.7.2 Test Results. Welder qualification test results for Class B fillet welds shall meet the following requirements:

8.7.2.1 Visual Examination. All test welds shall meet the visual acceptance criteria of 8.9.

8.7.2.2 Macroetch Test. Macroetch test sections shall reveal no cracks at 5X magnification and shall meet the acceptance criteria of 8.10.

8.7.2.3 Fillet-Weld-Break Tests. A fillet weld break test shall pass the test if it bends flat upon itself. If the fillet weld fractures, it shall show fusion to the root of the joint for at least 90 percent of the joint length, but not necessarily beyond. The fractured surface shall not exhibit porosity (including piping porosity) or inclusions exceeding 5 mm (3/16 in.) in the greatest dimension; the total number of these discontinuities up to 5 mm (3/16 in.) in the greatest dimension, shall not exceed two (2) per 25 mm (1 in.) of weld length nor eight (8) per

150 mm (6 in.). Discontinuities less that 1.5 mm (1/16 in.) shall be ignored.

Part III Examination

8.8 Examination Requirements

All Class B production welds shall, as a minimum, be visually examined in accordance with section 6, Part II. Any additional examination shall be as specified by the Customer, and performed in accordance with the requirements of section 6, as applicable. Acceptance criteria shall be in accordance with the following.

8.9 Visual Acceptance Criteria

The following acceptance criteria, in accordance with the procedures and standards of section 6, Part II, shall apply to all Class B welds during visual examination for surface defects.

8.9.1 The weld shall have no cracks.

8.9.2 Complete fusion shall exist between adjacent weld beads and full penetration shall exist between weld metal and base metal.

8.93 All craters shall be filled.

8.9.4 Weld profiles shall be in accordance with Figure 8.5(A), (B), or (D).

8.9.5 The sum of the diameters of porosity which exceeds 1.5 mm (1/16 in.) in diameter shall not exceed 10 mm (3/8 in.) in any linear 25 mm (1 in.) of weld.

8.9.6 Undercut shall not exceed 1.5 mm (1/16 in.) in depth with the following exception. Isolated undercut over 1.5 mm (1/16 in.) but not more than 3 mm (1/8 in.) or 20 percent of the base-metal thickness in depth, whichever is less, shall be permitted, provided it does not exceed 10 mm (3/8 in.) in length and it shall be separated by a minimum of 150 mm (6 in.) from adjacent undercut that is deeper than 1.5 mm (1/16 in.). The maximum length of undercut between 0.8 mm (1/32 in.) and 1.5 mm (1/16 in.) in depth shall not exceed 100 mm (4 in.) in any continuous 300 mm (12 in.) of weld. Undercut less than 0.8 mm (1/32 in.) in depth shall be acceptable without restrictions.

8.9.7 When root surfaces are present and accessible, drop-through is not limited. Incomplete joint penetration^, or melt-through is limited to 3 mm (1/8 in.) maximum

Was this article helpful?

0 0

Post a comment