DAIKOWT 625W

GTAW
  • NICKEL ALLOYS
625W

Description

Rod with a nominal composition of 64% Ni, 22% Cr, and 9% Mo (Nb-free)
Rod with a composition similar to ERNiCrMo-3 but without Nb. It ensures a microstructure free from intermetallic phases (e.g., niobium nitride), high toughness, and excellent resistance to hot cracking. Suitable for welding super duplex and superaustenitic steels in low-temperature applications, for cryogenic impacts, for welding similar nickel-chromium-molybdenum alloys, and for cladding on low-alloy steels. Ideal if the part needs to be deformed after welding.
Specifications
EN ISO 18274
S Ni 6660
AWS A5.14
ERNiCrMo-20
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
43
A-No (QW442)
-

Pren

60.28
Chem. Comp. %
0
C
0.01
Mn
0.04
Ni
64
Cr
22
Nb
0.01
Al
0.1
P
0.003
S
0.001
Mo
10
Si
0.05
Cu
0.05
Fe
0.5
Ti
0.1
W
3.2
Mechanical Properties
min
variant
Tensile strength Rm MPa
750*
760
Yield strength Rp0.2 MPa
0
500
Elongation A (L0=5d0) %
0
40
Impact Charpy ISO-V
-
130J @ 20°C
Impact Charpy ISO-V
-
110J @ -50°C
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 120A
130A - 160A
Voltage
10V - 13V
14V - 18V
Packaging
Ø 1,0÷4,0mm
Ø 1,0÷4,0mm
Packaging Type
5kg carton tube
5kg carton tube
625W
Description

Application

This consumable is similar to DAIKOW 625 (ERNiCrMo-3), but it is distinguished by the absence of Nb. The weld metal, which is fully austenitic, offers excellent ductility and high impact resilience even at low temperatures. It ensures remarkable resistance to hot cracking and displays a microstructure free of intermetallic phases, such as niobium nitride, along with excellent toughness. Its resistance properties, both to pitting and intergranular corrosion in chloride environments, make it ideal for applications in seawater and offshore sectors, among others. It is particularly suitable when the component, such as a pipe or fitting, needs to undergo plastic deformation after welding. The maximum oxidation temperature is around 1100 °C.

Alloy Type

The nominal composition (wt. %) of filler metal of this classification is 64 Ni, 22 Cr, and 9 Mo (niobium free).

Microstructure

Fully austenitic with extra low content of secondary phases.

Materials

Suitable for welding of Nickel-Chromium- Molybdenum alloys of similar composition as well as for cladding on low alloyed steels. Also suitable to weld superduplex, superaustenitic and cryogenic 9%Ni steels.
  • EN W.Nr.: 1.4547, 1.4529, 2.4856, 1.4539, 1.4410
  • ASTM: A494 CW-6MC, 904L, A182 F53, A182 F55, SAF 2507, A890 Gr. 5A, A890 6A
  • UNS: N08926, S31254, N06625, S32750, S32760, N08904, S32750
  • PROPRIETARY: Inconel® 625, 601 (Special Metals), Incoloy® 800H, 825 (Special Metals), Nicrofer 6020hMo, 6022hMo (VDM), 254 SMO (Outokumpu), SAF 2507 (Sandvik)

Welding & PWHT

Before proceeding with the welding or heating of nickel-based alloys, it is crucial to ensure that the base metal is perfectly clean. Residues of oil, grease, paint, lubricants, marking pencils, temperature indicating materials, thread compounds, and the like often contain sulfur or lead, elements that can cause brittleness in the base metal or filler metal if present during the welding or heating. Welding on fully austenitic and nickel-based steels requires careful attention to minimize heat input, interpass temperature, and dilution with the base metal. It is essential to maintain a low heat input, with a maximum of 1.5 kJ/mm, and an interpass temperature not exceeding 100 °C. No post-weld heat treatment (PWHT) is generally necessary, although in particular cases, annealing and quenching at 1050 °C are possible.

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