 |
|||
|
|
|||
| ||||||||||
|
|  MI L-R-17131C
4,3. 3.2.2 Acceptance criteria. If any sample fails to conform to
the requirements specified in table II or table III, as applicable, the
lot of material represented by the sample shall be rejected.
4.3.3.3 Sieve analysis.
4,3,3.3,1 Procedure. The samples selected in accordance with
4.2.3.3 shall be tested in accordance with ASTM B 214.
4,3. 3.3.2 Acceptance criteria. A lot represented by a sieve
analysis in which the sum of the weight of the sample retained on the 80
mesh sieve plus the weight of the sample passed through the 325 mesh sieve
exceeds 2 percent of the sample weight shall be rejected.
4.3.3.4 Weld test (when specified (see 6.2.1)).
4.3.3.4,1 Procedure. Test assemblies shall be prepared on which
samples obtained in accordance with 4.2.3.4 shall be deposited by hard-
surfacing processes as specified below:
MIL-RCoCr-A-l
MIL-RCoCr-A-2 - Oxyacetylene (1-1/2 to 3X feather)
MIL-RCoCr-A-3 - Tungsten Inert Gas Welding (TIG)
All other rods - As specified by the command or agency concerned
(see 6.2.1)
All powders - Plasma Transferred Arc (PTA)
A minimum overlay of four square inches minimum shall be deposited,
consisting of three layers for rods and two layers for powder, on a test
piece six inches by three inches by 3/4 inch minimum As an alternate
for powders, the test piece may be two to three inches in diameter by six
inches minimum length. The test piece shall be a weldable grade of low
carbon steel for deposits of cobalt, nickel and iron base rods and type
302 or 304 stainless steel for all powder deposits, unless otherwise
specified by the command or agency concerned. During welding the
operating characteristics shall be noted and compliance with 3.7 verified.
After cooling and visual examination of the finished weld, the surface
of the overlay shall be ground smooth and five randomly located hardness
readings taken. After hardness testing, the assembly shall be sectioned
to provide a minimum of three coupons for macro-examination at 10X
magnification in the polished and etched condition.
4.3,3.4.2 Acceptance criteria, weldability. If any sample fails
to conform to the requirements of 3.7, the lot represented by the sample
shall be rejected.
4. 3.3.4.3 Acceptance criteria, visual examination. If any sample
fails to conform to the requirements of 3.7, the lot represented by the
sample shall be rejected,
4.3.3,4.4 Acceptance criteria, hardness. The minimum hardness of
the overlay shall be as specified (see 6.2 .1).
10
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals