625W

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.

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

Fully austenitic with extra low content of secondary phases.

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)

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.