Appendix C to Part 192 - Qualification of Welders for Low Stress Level Pipe
49:3.1.1.2.8.18.8.1.16 : Appendix C
Appendix C to Part 192 - Qualification of Welders for Low Stress
Level Pipe
I. Basic test. The test is made on pipe 12 inches (305
millimeters) or less in diameter. The test weld must be made with
the pipe in a horizontal fixed position so that the test weld
includes at least one section of overhead position welding. The
beveling, root opening, and other details must conform to the
specifications of the procedure under which the welder is being
qualified. Upon completion, the test weld is cut into four coupons
and subjected to a root bend test. If, as a result of this test,
two or more of the four coupons develop a crack in the weld
material, or between the weld material and base metal, that is more
than 1/8-inch (3.2 millimeters) long in any direction, the weld is
unacceptable. Cracks that occur on the corner of the specimen
during testing are not considered. A welder who successfully passes
a butt-weld qualification test under this section shall be
qualified to weld on all pipe diameters less than or equal to 12
inches.
II. Additional tests for welders of service line connections
to mains. A service line connection fitting is welded to a pipe
section with the same diameter as a typical main. The weld is made
in the same position as it is made in the field. The weld is
unacceptable if it shows a serious undercutting or if it has rolled
edges. The weld is tested by attempting to break the fitting off
the run pipe. The weld is unacceptable if it breaks and shows
incomplete fusion, overlap, or poor penetration at the junction of
the fitting and run pipe.
III. Periodic tests for welders of small service lines.
Two samples of the welder's work, each about 8 inches (203
millimeters) long with the weld located approximately in the
center, are cut from steel service line and tested as follows:
(1) One sample is centered in a guided bend testing machine and
bent to the contour of the die for a distance of 2 inches (51
millimeters) on each side of the weld. If the sample shows any
breaks or cracks after removal from the bending machine, it is
unacceptable.
(2) The ends of the second sample are flattened and the entire
joint subjected to a tensile strength test. If failure occurs
adjacent to or in the weld metal, the weld is unacceptable. If a
tensile strength testing machine is not available, this sample must
also pass the bending test prescribed in subparagraph (1) of this
paragraph.
[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR
37504, July 13, 1998; Amdt. 192-94, 69 FR 32896, June 14, 2004]