Description

WELD STAR (NiCrMo-3) ALLOY 625 MIG FILLER WIRE 1.0MM 15KG SPOOL

AWS A5.14 – ER NiCrMo-3

A 15KG spool of Weld Star 1.0mm (NiCrMo-3) Alloy 625 MIG Welding Wire. Specifically developed for welding and cladding alloys of a Nickel (Ni) based nature such as 625 or materials of a similar composition. Typically used for applications in harsh environments such as chemical process plants, marine engineering and nuclear reactor plant components. Available in diameters of 1.0 and 1.2mm. Precision wound and layered for superior wire feeding characteristics.

Weld Star (NiCrMo-3) Alloy 625 MIG filler wire exhibits excellent mechanical properties within a wide working temperature range from cryogenic levels (-150°C to -273°C) upto 540°C. These properties include excellent resistance to the effects of stress corrosion and pitting. Combined with good levels of ductility allowing the weld metal to bend and misshape while still maintaining structural integrity in its finished state.

The key chemical composition of this wire is mainly made from a combination of Nickel (Ni), Chromium (Cr) and Molybdenum (Mo). With Nickel (Ni) ensuring increased levels of mechanical strength and impact toughness. Chromium (Cr) provides good levels of stability at high temperatures and corrosion resistance. In the case of Molybdenum (Mo) it also has increased strength levels particularly at high temperatures. Additionally giving good corrosion resistance and high thermal conductivity.

Features & Benefits

Excellent resistance to the effects of stress corrosion.
Increased strength levels at high temperature.
Precision wound and layered for superior wire feeding characteristics.
Good levels of Impact Toughness.
High thermal conductivity.
Wide working temperature range.
Increased levels of ductility.
Ideal for applications in harsh environments.

Applications / Industries

Chemical Process Plants
Marine Engineering
Nuclear Reactor Plant Components
Pump Shafts
Aerospace Industry
Weld overlay and spacers for heat recovery systems
Furnace Muffles
After-burners and combustion systems.

Stress Corrosion Cracking and Pitting?

Stress Corrosion Cracking (SCC) occurs when there is an increased level of tensile strength within the presence of a corrosive environment. As a result this issue can have quite serious failure consequences, including a breakdown in components structures, which can lead to the appearance of brittle cracks. This type of corrosion will either form as Intergranular Stress Corrosion Cracking or Transgranular Corrosion Cracking:

- Intergranular Stress Corrosion Cracking (IGSCC) – is where the facture occurs along the grain boundaries of the material.
- Transgranular Stress Corrosion Cracking (TGSCC) – is where the facture is formed through the grains of the material instead of the along the grain boundaries.

The three factors that cause stress corrosion cracking are material, environment and tensile stress. Therefore it is recommended using a welding filler material such as 625 Alloy MIG wire as it has excellent resistance to this form of corrosion. Furthermore, where possible it is advisable to reduce potential environmental dangers and limit the amount of tensile stress applied to materials.

Conversely pitting is a more localised form of attack where tiny holes or craters appears in the metal surface. In particular this issue is often likely to occur in the heat affected zone of welded joints. Because of the subtle nature of how this type of corrosion forms it is not always obvious it has taken hold until the level of damage is particularly severe. However the best way to avoid the issue of pitting is by using a filler wire such as 625 Alloy as you would in order to avoid the issue of Stress Corrosion Cracking.

Welding Positions

EN ISO 6947 – PA, PB, PC, PD, PE, PF

Chemical Analysis

C%	Mn%	Fe%	P%	S%	Si%	Cu%
max	max	max	max	max	max	max
0.10	0.50	0.50	0.015	0.015	0.50	0.50

Ni%	Co%	Al%	Ti%	Cr%	Nb+Ta%	Mo%
60.00	max	max	max	20.00	3.15	8.00
min	1.0	0.40	0.40	23.00	4.15	10.00

Mechanical Properties

Tensile Strength	≥760 MPa
Yield Strength	≥415 MPa
Elongation	≥35%
Impact Strength	≥100 J

Mechanical properties are approximate and may vary based on the heat, shielding gas, welding parameters and other factors.

Shielding Gases

EN ISO 14175 – I1, I3

Typical Base Materials

Inconel 601, Incoloy 800, Alloy 625, Alloy 825, Alloy 926*
* Illustrative, not exhaustive list

In Conclusion

As noted above Weld Star Alloy 625 MIG Filler Wire has an excellent range of mechanical properties particularly in the presence of harsh and corrosive environments. Combined with good levels of impact toughness and tensile strength. This MIG wire also exhibits great resistance to stress corrosion cracking and pitting even at high temperatures. Moreover, it also has outstanding ductile capabilities, allowing bending and misshaping without compromising the integrity of the finished weld. Designed to be used with similar base metals in a wide range of applications and industries.

Please note that these 15kg spools will not fit all of our MIG welders. If in doubt, please call and one of our team will happily advise.

Wire images are for illustration only.