Nickel Alloy Welding Wire Hastelloy Wires Roll Electrical and Electronics Industry
Nickel alloy welding wire is a specialized type of wire used for welding nickel alloys and sometimes other metals. Nickel alloys are known for their corrosion resistance, high temperature performance, and unique physical properties, making them suitable for use in harsh environments such as those found in the chemical processing, power generation, and aerospace industries. Here are some key details regarding nickel alloy welding wire:
Types of Nickel Alloy Welding Wires
- Nickel-Copper Alloys (Monel): Often used in saltwater environments due to their excellent resistance to sea water corrosion.
- Nickel-Chromium Alloys (Inconel): Known for their ability to withstand extreme temperatures, both high and low.
- Nickel-Iron-Chromium Alloys (Incoloy): Offer good strength and excellent resistance to oxidation and carbonization in high-temperature environments.
- Nickel-Molybdenum Alloys (Hastelloy): Best known for their resistance to corrosion in a wide range of aggressive media.
- Pure Nickel: Offers good welding properties and high corrosion resistance in a wide variety of environments.
Applications
- Chemical Processing Industry: Pipes and heat exchangers, due to their corrosion resistance to acids and alkalis.
- Aerospace: Engine components, due to their high-temperature strength and resistance to thermal expansion.
- Power Generation: In the construction of nuclear reactors and gas turbines because of their resistance to high-temperature oxidation.
- Oil and Gas: In areas with sour gas (high sulfur content) due to their resistance to sulfidation.
Considerations for Welding with Nickel Alloy Wire
- Welding Technique: TIG (Tungsten Inert Gas) welding is commonly used for nickel alloys due to the precise control it offers. MIG (Metal Inert Gas) welding is also used, especially for thicker materials.
- Preheat and Post-Weld Heat Treatment: Depending on the specific nickel alloy, preheating and/or post-weld heat treatment might be necessary to prevent stress-corrosion cracking.
- Matching Filler Metals: It's important to use a filler metal that closely matches the chemical composition of the base metal to ensure a weld with similar properties.
Advantages of Nickel Alloy Welding Wire
- Corrosion Resistance: Especially in harsh environments such as acidic or alkaline conditions.
- High-Temperature Performance: Maintains strength and resists oxidation at elevated temperatures.
- Versatility: Can be used to weld a wide range of nickel alloys and some dissimilar metals.
Challenges
- Cost: Nickel alloy welding wire can be more expensive than other types of welding wire.
- Weldability: Some nickel alloys can be challenging to weld due to their high strength and tendency to crack.
The following table lists only some of the grades:
| Grade | UNS | DIN |
| Monel 400 | N04400 | W.Nr. 2.4360 |
| Monel K-500 | N05500 | W.Nr. 2.4375 |
| Inconel 625 | N06625 | W.Nr. 2.4856 |
| Inconel 718 | N07718 | W.Nr. 2.4668 |
| Inconel X-750 | N07750 | W. Nr. 2.4669 |
| Inconel 600 | N06600 | W.Nr. 2.4816 |
| Inconel 601 | N06601 | W.Nr. 2.4851 |
| Incoloy 825 | N08825 | W.Nr. 2.4858 |
| Incoloy A-286 | S66286 | W.Nr.1.4980 |
| Hastelloy C-276 | N10276 | W.Nr.2.4819 |
| Hastelloy C-22 | N06022 | W.Nr.2.4602 |
| Hastelloy C-4 | N06455 | W.Nr.2.4610 |
| Hastelloy B-3 | N10675 | W.Nr.2.4600 |
| Hastelloy X | N06002 | W.Nr.2.4665 |
| Hastelloy B-2 | N10665 | W.Nr.2.4617 |
