WELD-A

The welding metal WELD-A does not have a directly equivalent base material, although its composition is related to Inconel 600. The elements of Molybdenum (Mo) and Niobium (Nb) provide high resistance to hot cracking, greater tolerance to dilution in many combinations of nickel-based and ferrous alloys, and stable properties over a wide range of service temperatures from –269 °C to over 900 °C. The presence of Mo significantly enhances properties at elevated temperatures, above approximately 600 °C. These consumables are ideal for welding high-nickel-content or heat-resistant alloys, due to their use in furnace equipment and petrochemical plants at temperatures up to about 900 °C. Additionally, they are suitable for welding on dissimilar combinations of the aforementioned alloys and other types, such as Monel 400 and Incoloy 825, paired with low alloy carbon-manganese stainless steels, without the necessity for preheating. If required, stress relief can be performed, and transition welds for high-temperature applications maintain good structural stability. Furthermore, they can be effectively employed in low-temperature applications, like 3% Ni or 5% Ni steels used for cryogenic vessels and pipelines operating at temperatures of –100 °C or lower. The requirements for preheat and post-weld heat treatment (PWHT) depend on the base material to be welded; however, for most nickel-based alloys, neither preheating nor PWHT is generally required.

Inconel™ type consumables similar to DAIKO 82 but with lower Mn and a Mo addition.

In the as-welded condition this nickel base weld metal consists of austenite with a few carbides.

Nickel base steel or high nickel alloys to themselves and to mild, low alloy, and stainless steels. Cryogenic 3-5%Ni steels.

• PROPRIETARY: Inconel® 600, 601 (Special Metals), Incoloy® 800, 800H, DS (Special Metals), Nilo® (Special Metals), Brightray® (Special Metals)