How to Weld with Inconel 625 Welding Rod: Techniques and Best Practices

Inconel 625 Welding Rods

Welding can prove to be a complex process with various techniques and best practices, contingent on the type of metal being welded. When welding with Inconel 625, a popular nickel-chromium-molybdenum alloy, there are a few key considerations and techniques to remember. In this blog, we’ll take a deep dive into the world of Inconel 625 welding rod, covering everything from preparation to execution.

What is Inconel 625 Welding Rods?

Inconel 625 Welding Rod is a tungsten-based rod used for welding on components made from Inconel, a nickel-chromium alloy. It provides excellent corrosion and oxidation resistance in extreme temperatures and resistance to acids and other aggressive chemical environments. Its strength is highly resistant to cracking even under sustained stress or high heat fluxes, while its ductility makes cold forming possible.

Advantages of Inconel 625 Welding Rod

These rods offer several advantages over other welding rods, making them an excellent choice for various applications.

One of the primary advantages of these welding rod is their high corrosion resistance. This makes them ideal for use in environments where other welding rods would quickly corrode.

Inconel 625 welding rods are also resistant to high temperatures, making them ideal for applications where other welding rods would melt or degrade.

Another advantage of Inconel 625 welding rods is their low coefficient of thermal expansion. This means that they will not expand or contract as much as other materials when exposed to changes in temperature, making them less likely to warp or distort.

Finally, Inconel 625 welding rods are non-magnetic, making them ideal for applications where magnetic materials would be undesirable.

Essential Techniques and Best Practices of Inconel 625 Welding Rod

Cleanliness is Key

One of the most important factors in Inconel 625 welding is ensuring the metal is clean and free of contaminants. This means thoroughly cleaning the metal with acetone or a similar solvent before the welding begins. Even the smallest amount of dirt or oil can cause problems with the welding process, so be sure to take the time to clean the metal properly.

Preheat the Metal

Preheating the metal is another critical step in Inconel 625 welding. People can accomplish this by using a portable propane torch or another heating source, and they should perform it before commencing the actual welding process. Preheating helps ensure that the metal is at the correct temperature for welding and can prevent problems like cracking and distortion during welding.

Use the Right Welding Rod

When welding with Inconel 625, using the correct welding rods is essential. Inconel 625 welding rods have a specific design for this type of metal, and manufacturers produce them from a combination of nickel, chromium, molybdenum, and other materials. Using the wrong type of welding rods can result in weak welds, which can jeopardize the integrity of the finished product.

Control the Welding Process

Inconel 625 is a high-strength material that can be difficult to work with without being careful. To prevent problems like cracking and distortion, it’s important to control the welding process as much as possible. This might mean using a slower welding speed, making smaller welds, or using a specific welding technique that’s designed for Inconel 625.

Post-Welding Treatment

Once the welding process is complete, treating the metal properly is important to maintain its strength and integrity. This might mean annealing the metal to reduce residual stress or using a specific cleaning process to remove any residual contaminants from the welding process. Taking the time to properly treat the metal after welding can help to ensure that the finished product is of the highest quality possible.


When welding with Inconel 625, key considerations and techniques must be remembered. By ensuring that the metal is clean and free of contaminants, preheating the metal, using the correct welding rods, controlling the welding process, and properly treating the metal post-welding, you can create high-quality welds that will stand the test of time. Whether you’re a seasoned welder or just starting in the field, following these best practices for Inconel 625, welding can help you achieve the results you’re looking for.