Things to Know when Welding with Nickel Alloys
If you are welding with nickel alloys, your goal is to resist some type of corrosion such as pitting, crevice, and/or stress-corrosion cracking. No post weld treatment is needed to maintain corrosion-resistance when using nickel-based alloys.Nickel alloys have a low thermal conductivity, resist scaling and oxidation at elevated temperatures, and do not harden without special effort and technique. Even when faced with multiple heating and cooling cycles they retain these properties
Things to be aware of when welding with nickel and nickel alloys:
- Welding nickel is highly susceptible to embrittlement when it comes into contact with sulfur, phosphorus, and lead at elevated temperatures. These contaminants can exist in grease, oil, paint, marking crayons or inks, forming lubricants, cutting fluids, shop dirt, and processing chemicals. The joint to be welded must be well-cleaned before work begins.
- During welding, nickel forms a tenacious viscous oxide, which limits the wettability and flow of the weld metal. Adding helium (25% to 50%) to the shielding gas can help wet the puddle.
- When using nickel-based consumables, the weld joint must be opened wider to allow for better accessibility.
High-nickel alloys are designed to withstand highly corrosive environments most generally associated with high-pressure environments and elevated temperatures. You’ll frequently find them used in oil and gas, aerospace, and power-generating industries for joining and cladding. Nickel alloys with higher percentages of copper, (CuNi-Gen 413 or NiCu-Gen 418, for instance) are often used to fabricate hardware in marine, chemical, and desalination construction.
They can be used with most welding processes, and CWI (Central Wire Industries) Welding Generation 4 manufactures an assortment of nickel-based and high nickel welding consumables for TIG, MIG, SAW, and SMAW processes. To learn all about our Gen4 welding consumables, visit our website at www.centralwire.com, or contact our sales team directly at firstname.lastname@example.org. Our metallurgical experts are ready to answer your questions!