DAIKOWS 686

SAW
  • NICKEL ALLOYS
686

Description

Solid wire for Nickel based alloy 686
It is designed to match Alloy 686. The high alloy levels of Cr, Mo , W result in increased resistance to pitting, crevice, intergranular attack and general corrosion. It is also suitable for welding duplex, super-duplex and super-austenitic stainless steels, as well as nickel alloys and to overmatch 625, C276, C4, C22 and 59 alloys. This consumable also provides a tough Nb-free weld metal and is of great value for service environments requiring general corrosion- resistance in HCl or sulfuric acid.
Specifications
ISO 18274
S Ni 6686
AWS A5.14
ERNiCrMo-14
Shielding
DAIKOFLUX 960-W
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
43
A-No (QW442)
-

Pren

80.495
Chem. Comp. %
DEFAULT
C
0.01
Mn
0.23
Ni
58
Cr
20.6
Al
0.2
P
0.002
S
0.001
Mo
16.2
Si
0.01
Cu
0.01
Fe
1
Ti
0.05
W
3.9
Mechanical Properties
min
variant
Tensile strength Rm MPa
760*
780
Yield strength Rp0.2 MPa
0
440
Elongation A (L0=5d0) %
0
40
Impact Charpy ISO-V
-
90J @ -196°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
Ampere
300A - 410A
Voltage
27V - 33V
Packaging
Ø 1,6÷3,2mm
Packaging Type
K415 spool and drums.
686
Description

Application

Tailored with precision, these consumables are designed to replicate the composition and characteristics of alloy 686. The heightened levels of Nickel (Ni) and Molybdenum (Mo) offer robust resistance in reducing conditions, complemented by the substantial Chromium (Cr) content providing resilience against oxidizing media. Notably, the inclusion of Molybdenum (Mo) and Tungsten (W) enhances resistance to localized corrosion, specifically addressing issues such as pitting. The low Carbon (C) content plays a pivotal role in minimizing grain boundary precipitation, ensuring the preservation of corrosion resistance within the heat-affected zones of welded joints. Remarkably versatile, this alloy also furnishes a durable Nb-free weld metal, suitable for dissimilar welds involving superaustenitic and superduplex stainless steel, or combinations thereof with Nickel-based alloys. Furthermore, it exhibits exceptional as-welded resistance to sulfuric or hydrochloric acids, their mixtures, and displays resilience against crevice or pitting corrosion in hot concentrated acid chloride solutions. Predominantly applied in chemical and petrochemical processing, pollution control, oil and gas extraction, oil refining, and marine environments, these consumables are invaluable. Their utility extends to dissimilar metal welding applications, providing protection against preferential weld-metal attack, particularly when joining Molybdenum-containing alloys or alloy-clad steels.

Alloy Type

The nominal composition (wt. %) of the filler metal of this classification is 57 Ni, 21 Cr, 16 Mo, and 4 W.

Microstructure

Single-phase austenitic Ni-Cr-Mo-W alloy.

Materials

Used for welding nickel-chromium-molybdenum alloy to itself, to steel, to other nickel-base alloys, and for cladding steel using the GTAW, GMAW, and SAW processes. It is also suitable to weld overmatching 625, C276, C4, C22, 59 alloys and superduplex and superaustenitic steels.
EN W.Nr.: 2.4606 (NiCr21Mo16W).
UNS: N06686, N06022, N06059, N06200, N08367, NO8926, NO8031.
PROPRIETARY: Inconel® Alloy 686 (Special Metals), Incoloy® Alloy 25-6MO, 27-7MO (Special Metals).

Welding & PWHT

Prior to welding or subjecting any nickel-base alloy to heat, it is imperative that the base metal undergo thorough cleaning. Common substances such as oil, grease, paint, lubricants, marking pencils, temperature-indicating materials, and threading compounds frequently contain sulfur or lead, posing a potential risk of inducing cracking (embrittlement) in both the base metal and the weld metal if present during welding or heating. When conducting welding activities involving fully austenitic and nickel base steels, meticulous attention must be paid to minimize factors such as heat input, interpass temperature, and dilution with the parent metal. Striving for a low heat input is essential, with a strict maximum of 1.5 kJ/mm, coupled with a stringent interpass temperature limit of 100°C. It is noteworthy that, in this context, no post-weld heat treatment is deemed necessary to restore corrosion resistance. These precision-oriented measures are critical in ensuring the integrity and performance of welds in fully austenitic and nickel base steels, particularly with regard to corrosion resistance.

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