WELD STAR 625 NICKEL TIG FILLER RODS 2.4MM 5KG (NiCrMo-3)
A 5kg pack of 2.4mm Weld Star 625 Nickel TIG rods (NiCrMo-3). 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 1.6, 2.4mm and 3.2mm.
Weld Star NiCrMo-3 Alloy 625 TIG 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). Nickel (Ni) ensures increased levels of mechanical strength and impact toughness. Chromium (Cr) provides good levels of stability at high temperatures and corrosion resistance. Molybdenum (Mo) contributes to 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.
- 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 component 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 a fracture occurs along the grain boundaries of the material.
- Transgranular Stress Corrosion Cracking (TGSCC) – is where a fracture forms through the grains of the material instead of along the grain boundaries.
The three factors that cause stress corrosion cracking are material, environment and tensile stress. It is recommended to use a welding filler material such as 625 Alloy MIG wire as it has excellent resistance to this form of corrosion. Where possible it is also 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 appear on 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. 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.
|Chemical Composition %
Mechanical properties are approximate and may vary based on the heat, shielding gas, welding parameters and other factors.
|EN ISO 18274 – Ni 6625 – NiCr22Mo9Nb
|AWS A5.14 – ER NiCrMo-3
Typical Base Materials
Inconel 601, Incoloy 800, Alloy 625, Alloy 825, Alloy 926*
* Illustrative, not exhaustive list
EN ISO 14175 – TIG: I1 (Argon)
EN ISO 6947 – PA, PB, PC, PD, PE, PF, PG
As noted above Weld Star Alloy 625 TIG 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, these TIG rods also exhibit 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.
Images are for illustration purposes only.