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# How to Weld Duplex Stainless Steel
By ridgexmetals.com

# How to Weld Duplex Stainless Steel

How to Weld Duplex Stainless Steel

Duplex stainless steel is one of the most robust and corrosion-resistant alloys available today. It’s used in a variety of applications, from construction to chemical processing, due to its remarkable properties and strength. If you’re considering welding duplex stainless steel, here’s what you need to know.

What Is Duplex Stainless Steel?

Duplex stainless steel is an alloy made up of two types of stainless steel – austenitic and ferritic – combined with chromium and other elements. In comparison to other forms of stainless steel, the duplex has higher strength and better resistance to corrosion and wear. It also has excellent welding properties when done correctly.

What You Need To Weld Duplex Stainless Steel

The most important part of welding duplex stainless steel is using the right equipment. As with any welding job, you need the right type of welder; in this case, a TIG or MIG welder equipped with an inverter power source is ideal. You also need special tungsten electrodes designed specifically for duplex stainless steel and a shielding gas and flux core wire to complete your setup.

It’s important to note that if you’re working with thicker pieces (over 1/8 inch), preheating them before beginning your weld is best practice. The preheating process will ensure that the metal won’t cool too quickly during the welding process, which can lead to cracking or warping.

Once you have all of your equipment ready, it’s time to begin your welding! Start by setting up your welder according to the manufacturer’s instructions; then, use the appropriate settings for your project based on material thickness and amperage requirements. When ready, start by making a few tack welds around the edges of the joint before continuing with a full bead. Make sure that you keep your weld pool shallow, so it doesn’t become too hot or run away from you during layering; otherwise, you may end up with slag inclusion or incomplete fusion along your weld line! Be sure not to over-weld, as this can cause cracking in some metal regions due to excessive heat buildup.


Welding duplex stainless steel requires precision and knowledge. With careful preparation and attention paid throughout each step in the process, it can result in strong and durable joints that stand up against high temperatures and extreme environments better than other materials would fare under similar circumstances! With the right tools and technique, anyone can learn how to successfully weld this remarkable alloy – so get started today!

Welding duplex stainless steel can be a tricky but rewarding task. Duplex stainless steel has excellent corrosion resistance and mechanical properties, but it is susceptible to the heat associated with welding. This means it is important to take extra care when welding duplex stainless steel, as any mistakes can compromise the strength and durability of the weld. This guide will help you understand the best techniques and preparation to get the highest-quality welds possible.

Before beginning any welding project, it is essential to preheat the material to be welded. Preheating will ensure that the material is in a stable, consistent state. The preheating temperature will depend on the type and thickness of the material, but is typically around 250°F for duplex stainless steel.

Next, choose the correct type and size of welding wire for the job. For duplex stainless steel, the most common types of welding wires are austenitic stainless steel and duplex stainless steel. If you are using a duplex stainless steel, you should use a wire that has the same grade of steel, or one with a higher grade. Make sure to select a wire size that is compatible with the welding machine and the material being welded.

It is important to use a technique that produces wide and coalesced weld beads. This is because these welds are strong and even, and have good corrosion resistance. Short arc welding is an effective option for welding duplex stainless steel, as it helps to reduce warping and distortion while producing quality welds.

Finally, it is essential to use a temperature-controlled method to cool down the weld. This will reduce the risk of cracking caused by thermal shock. Generally, the cooling rate should be no more than 100°F per hour to prevent cracking and other welding issues.

Welding duplex stainless steel is a complex process, but following these steps will help ensure you end up with the highest-quality welds possible. Preheating correctly, selecting the right welding wire, using a welding technique that creates a wide, coalesced bead, and cooling down the weld slowly and evenly will ensure that the welds are strong and durable.

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  • 12/01/2023

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