Everything You Need To Know About Tig Welding Duplex Stainless Steel

Duplex stainless steel has become a popular material for industrial applications due to its durability and strength. When it comes to welding this material, it is essential to understand the best practices to ensure a successful weld. Tig welding is the most common method for welding duplex stainless steel and offers excellent results when done correctly. In this article, we will discuss the basics of tig welding duplex stainless steel and how to achieve the best results.

What is Duplex Stainless Steel?

Duplex stainless steel is a combination of ferritic and austenitic steel alloys. Its name derives from its two-phase microstructure which consists of both ferrite and austenite. It is known for its excellent corrosion resistance and strength, making it a popular choice for industrial applications such as pressure vessels, chemical tanks, and pipelines.

What is Tig Welding?

TIG (Tungsten Inert Gas) welding is a popular welding process that is used for welding a variety of metals. It is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld is protected by an inert gas, such as argon or helium, which keeps the weld pool free from contaminants. This welding process has excellent control and is ideal for welding thin or thick materials, as well as for making precise welds.

Why Is Tig Welding The Best Choice For Duplex Stainless Steel?

TIG welding is the most common method for welding duplex stainless steel due to its excellent control and precision. It is also the best choice for welding thin or thick materials as it does not produce as much spatter or slag. Additionally, the inert gas shield helps to protect the weld pool and the weld area from contaminants, which improves the quality of the weld.

Tig Welding Duplex Stainless Steel: Tips and Techniques

When tig welding duplex stainless steel, there are some important tips and techniques to keep in mind:

  • Ensure that all surfaces are clean and free from contaminants.
  • Use a pure tungsten electrode and an argon or helium shielding gas.
  • Use a slow travel speed and short arcs.
  • Ensure that the tungsten electrode is correctly positioned at a 90-degree angle to the workpiece.
  • Use the correct welding current.
  • Use a backing strip to prevent porosity.
  • Post-weld cleaning is essential to remove impurities.


Tig welding is an excellent method for welding duplex stainless steel due to its precision and control. By following the tips and techniques outlined in this article, you can ensure that your weld is of the highest quality and that it will stand up to the demands of your application. With the right preparation and welding techniques, tig welding duplex stainless steel can be a successful and rewarding process.

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