S9074-AQ-GIB-010/248 Rev 1
NOTES (continued): (c) A-45 filler material clad welds shall be as follows: quantitative chemical testing shall be required for the following elements to the specified acceptance values.
Weld Deposit Chemistry
Element
Percent
C
0.02 max
*Fe
No more than 103% of filler chemistry. **
Si (A-45A) Si (A-45B)
0.20 max 0.08 max
*Cr
At least 97% of actual filler chemistry. ** At least 97% of actual filler chemistry. **
*Mo
W 2.90 min * Filler metal chemistry for these elements (e.g., lot test certificate values) shall be reported per 4-6. ** Weld procedures developed for clad welding nickel-molybdenum- chromium alloy to ferrous base materials (such as HY-100) that exceed the dilution requirements for Ni, Mo, or Cr may be approved on a case basis.
(d) For clad filler materials other than A-45, elements requiring analysis and their acceptance criteria shall be as follows, unless otherwise specified by the governing component/system specification: (1) At least the first three major alloying elements of the filler material shall be checked; the alloying element having the highest specification percentage shall be the first, the element having the next highest percentage shall be the second, and so forth (e.g., for a 316L overlay, this shall mean that Cr, Ni, and Mo are checked). Carbon, nitrogen, silicon, and manganese shall not count in this regard. If the overlay has less than three major alloying elements, then those present shall be tested. The overlay base element (e.g., Fe for 316L overlay) shall not count in this regard, except for NiCu and A-41 overlays, where Ni shall be checked (along with Ti). Results for each tested element shall be no less than 97% of the actual filler metal chemistry*** for the filler material lot used for welding. (2) The basis element for the substrate (e.g., Fe for S-1 or S-8 plate) shall be checked. Results shall not exceed the lesser of the following: (i) The actual amount of the base element present in the filler metal plus 3% of the nominal basis element amount present in the base material. (ii) The maximum amount allowed by the specification for the clad filler material involved, if a value is listed. Where an intermediate surfacing filler material (butter layer) is applied to the substrate prior to overlaying, these requirements shall also apply to the butter layer filler material into the overlay, unless the butter material basis element is an alloying element (or basis element) of the overlay filler material, in which case the value shall be within the specified range of the overlaying material specification. (3) Where the criteria of (1) and (2) are not met, results can be submitted to NAVSEA for approval along with accompanying justification for why the associated dilution values are acceptable for the intended production application and service conditions. *** For gas metal arc welding, where filler metal lot composition is determined from the bare wire, the composition to be used for comparison to the final machined overlay can be obtained from a weld deposited pad prepared in accordance with the specification for the equivalent alloy covered electrode regarding pad size, number of layers, and other applicable requirements. (e) Chemical analysis shall be performed in accordance with the specifications required by the filler material specification for the cladding involved.
(Notes continued on next page.)
Figure 7-4. Test Assembly for Procedure Qualification for Cladding for Corrosion-Resistance (Also, See Figure 7-5 for Cylindrical Materials) - Continued
7-75
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