This specification gives the requirements for classifying
bare nickel and nickel- base alloy welding electrodes, strip electrodes, and
welding rods for use in GTAW, GMAW, PAW, and SAW with flux. Weld metal deposits
from these electrodes have a nickel content that is greater than that of any
other element. Nickel-base electrodes and rods follow the same basic
classification system as the nickel and nickel alloy covered electrodes in
SFA-5.11. These electrodes are used in ASME Code fabrication for a wide range
of cryogenic service, corrosion- resistant, and oxidation-resistant
applications.
Nickel-base welding electrodes and rods are assigned
F-Nos. 41–46 in QW-432 of Section IX for procedure and performance qualification.
These filler metals are used for welding nickel and nickel-base alloys listed
as P-Nos. 41–49 in QW/QB-422. Since nickel-base electrodes deposit nonferrous
weld metal, A-Numbers of QW-442 are not applicable.
When nickel-base alloys are welded, cleanliness is
imperative. Low-melting-point contaminants, such as sulfur, lead, and silver, may
cause embrittlement and subsequent cracking of the base metal or weld during
heating or welding. These electrodes and filler metals are commonly used for
welding dissimilar base metals and for clad overlay. In either case, it is important
to use welding techniques that minimize dilution of the weld deposit by the
base metal.
Most SFA-5.14 electrodes and rods have comparable
classifications in SFA-5.11. The following text gives some general descriptions
of the electrodes and rods in this specification.
The ERNiCr-3, ERNiCr-6, and ERNiCrFe-5 filler metals
can be used to join UNS N06600 base metal, listed in ASME Material Specifications
SB-163, SB-166, SB-167, SB-168, SB-366, SB516, SB-517, and SB-564. The selection
of the filler metal depends on the particular application.
The ERNiFeCr-1 filler metal is typically used to
weld UNS N08825 base metal, listed in ASME Material Specifications SB163, SB-366,
SB-423, SB-424, SB-425, SB-704, and SB-705.
ERNiFeCr-2 filler metal can be used to join UNS
N07718 base metal listed in ASTM B-637. The ERNiMo-2 filler metals can be used
for welding nickel molybdenum base metal (UNS N10003), listed in ASME Material Specifications
SB-366, SB-434, and SB-573. ERNiMo-3 filler metal is used for welding
dissimilar metal combinations of nickel base, cobalt-base, and iron-base
alloys.
The ERNiCrWMo-1 filler metal is generally used for
welding nickel–chromium–cobalt-molybdenum alloy (UNS N06230), listed in ASME
Material Specifications SB-366, SB-435, SB-564, SB-572, SB-619, SB-622, and
SB-626.
The ERNiCrMo-7 filler metal is intended for welding nickel–chromium–molybdenum
alloy (UNS N06455), listed in ASME Material Specifications SB-366, SB-574,
SB-619, SB-622, and SB-626.
Comments
Post a Comment