8 Essential Precautions for Stainless Steel Welding | MachineMFG

Inquire About Our Sheet Metal Machines Now!

8 Essential Precautions for Stainless Steel Welding

0
(0)

Are you in the welding industry and want to learn more about the precautions for welding stainless steel? Look no further!

In this blog post, we will provide you with essential information on the different types of stainless steel, welding electrodes, and welding current to ensure that you achieve the best results in your welding process. From chrome stainless steel to chromium nickel stainless steel, we’ve got you covered.

Keep reading to learn more about the dos and don’ts of welding stainless steel and how to avoid common mistakes that can negatively impact the quality of your weldment.

8 Precautions For Stainless Steel Welding

1. Chrome stainless steel

Chromium stainless steel is known for its resistance to corrosion from oxidizing acids, organic acids, and cavitation, as well as its heat resistance and wear resistance.

This type of steel is commonly used in power stations, the chemical industry, petroleum, and other equipment and materials.

However, chromium stainless steel has poor weldability, so it is important to pay attention to the welding process and heat treatment conditions during fabrication.

2. Chrome 13 stainless steel

Chromium 13 stainless steel has high hardenability after welding and is prone to cracking.

To avoid cracking, it is recommended to use the same type of chromium stainless steel electrodes (g202 and G207) for welding and to perform preheating above 300°C and slow cooling treatment at around 700°C after welding.

If post-weld heat treatment is not possible, it is recommended to use chromium nickel stainless steel electrodes (A107, A207).

3. Chrome 17 stainless steel

Chromium 17 stainless steel is improved with the addition of stability elements such as Ti, Nb, Mo, etc. to enhance its corrosion resistance and weldability. It has better weldability compared to chromium 13 stainless steel.

When using the same type of chromium stainless steel electrodes (G302 and G307), it is recommended to perform preheating above 200°C and tempering at around 800°C after welding.

If post-weld heat treatment is not possible, it is recommended to use chromium nickel stainless steel electrodes (A107, A207).

4. Chromium nickel stainless steel

When welding chromium-nickel stainless steel, repeated heating can cause carbides to precipitate, which decreases its corrosion resistance and mechanical properties.

5. Chromium nickel stainless steel electrode

Chromium nickel stainless steel electrodes are known for their good resistance to corrosion and oxidation. They are widely used in the chemical industry, chemical fertilizer production, petroleum, and the manufacture of medical machinery.

6. Chrome nickel stainless steel coating

Chromium nickel stainless steel coatings come in two types: titanium calcium and low hydrogen. The titanium calcium type can be used with both AC and DC power supplies, but AC welding has shallow penetration and is prone to reddening, so it is recommended to use DC power whenever possible.

Welding electrodes with a diameter of 4.0mm or less can be used for welding in all positions, while electrodes with a diameter of 5.0mm or greater are recommended for flat welding and flat fillet welding.

7. Welding rod

It is important to keep the electrode dry during use.

The titanium calcium type should be dried at 150°C for 1 hour, and the low hydrogen type should be dried at 200-250°C for 1 hour. Repeated drying is not allowed as it may cause cracking and peeling of the coating. This is to prevent oil and other dirt from adhering to the electrode coating, which would increase the carbon content of the weld and negatively impact the quality of the weldment.

8. Welding current

To prevent eye corrosion caused by overheating, it is important to use a welding current that is about 20% less than that used for carbon steel electrodes, and to keep the arc short. The interlayer should also be cooled quickly.

A narrow weld bead is preferred for best results.

How useful was this post?

Click on a star to rate it!

Average rating 0 / 5. Vote count: 0

No votes so far! Be the first to rate this post.

As you found this post useful...

Follow us on social media!

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Just a Step Away!

Sheet Metal Machines Await!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top